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Starchaser model rocket
Starchaser model rocket tutorialStarchaser model rocket
tutorialStarchaser model rocket tutorialStarchaser model rocket
tutorial Pro||||ENGINEER Wildfire 3.0ENGINEER Wildfire 3.0ENGINEER
Wildfire 3.0ENGINEER Wildfire 3.0
Schools Advance Edition
WF3M-SAE-L2-001-1
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Pro|ENGINEER Wildfire 3.0 Starchaser model rocket
PTC in partnership with
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Written by Mike Brown and the Engineers and staff at
Starchaser Industries Limited
Copyright 2006, Parametric Technology Corporation (PTC) and
Starchaser Industries Limited.
All rights reserved under copyright laws of the United Kingdom,
United States and other countries.
PTC, the PTC Logo, ProProProPro|ENGINEER, ProProProPro|DESKTOP,
Wildfire, Windchill, and all PTC product names and logos are
trademarks or registered trademarks of PTC and/or its subsidiaries
in the United States and in other countries.
Conditions of use Copying and use of these materials is
authorised only in the schools, colleges and universities of
teachers who are authorised to teach ProProProPro|ENGINEER in the
classroom.
All other use is prohibited unless written permission is
obtained from the copyright holder
Acknowledgements PTC: Andy Deighton, Tim Brotherhood
Feedback
[email protected]
In order to ensure these materials are of the highest quality,
users are asked to report errors to the author.
Suggestions for improvements and other activities would also be
very welcome.
Product code WF3M-SAE-L2-001-1
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Table of ContentsTable of ContentsTable of ContentsTable of
Contents Starchaser model rocket tutorialStarchaser model rocket
tutorialStarchaser model rocket tutorialStarchaser model rocket
tutorial
................................................................................................................................................................................................................................................................................................................................................................................................................................................1111
Table of ContentsTable of ContentsTable of ContentsTable of
Contents
....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................3333
Teachers notesTeachers notesTeachers notesTeachers notes
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................5555
Introduction
......................................................................................................................................5
Pre-requisites.....................................................................................................................................5
Abbreviations and terminology used within this
tutorial...............................................................................6
Installation and
setup..........................................................................................................................6
Pro|ENGINEER functionality addressed in this
tutorial................................................................................7
ICT areas addressed in this
tutorial........................................................................................................8
D&T subject areas addressed in this
tutorial.............................................................................................8
STEM related areas addressed in this
tutorial...........................................................................................8
BackgroundBackgroundBackgroundBackground....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................9999
Starchaser IndustriesStarchaser IndustriesStarchaser
IndustriesStarchaser Industries
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................9999
Lesson one Lesson one Lesson one Lesson one Product Requirement
Product Requirement Product Requirement Product Requirement
............................................................................................................................................................................................................................................................................................................................................................................................................................
11111111
Learning objectives:
.......................................................................................................................
11
Homework...................................................................................................................................
11
Lesson two Lesson two Lesson two Lesson two
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
11111111
Learning objectives:
.......................................................................................................................
12
Lesson three Lesson three Lesson three Lesson three Modelling
the rocket concept Modelling the rocket concept Modelling the
rocket concept Modelling the rocket concept
........................................................................................................................................................................................................................................................................................................................................................................
13131313
Learning objectives:
.......................................................................................................................
13
Task 1: Set working
directory.............................................................................................................13
Task 2: Creating a new Pro|ENGINEER part
........................................................................................14
Task 3: Creating the rocket concept sketch
...........................................................................................14
Task 4: Dimensioning the Rocket concept sketch
....................................................................................18
Task 5: Defining a geometric relationship
.............................................................................................22
Task 6: Assigning the required dimension
values....................................................................................24
Task 7: Adding a Datum Planes to the
concept......................................................................................25
Task 8: Assigning parameters
............................................................................................................27
Lesson four Lesson four Lesson four Lesson four Top Down Design
Top Down Design Top Down Design Top Down Design
........................................................................................................................................................................................................................................................................................................................................................................................................................................
28282828
Learning objectives:
.......................................................................................................................
28
Task 9: Creating an
Assembly............................................................................................................29
Task 10: Adding the concept part to the assembly
.................................................................................30
Task 11: Creating the rocket
fuselage..................................................................................................32
Task 12: Assigning material properties and other
parameters....................................................................39
Task 13: Modelling the rocket nose cone
.............................................................................................41
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Task 14: Assigning material properties and other
parameters....................................................................52
Task 15: Modelling the Fins
..............................................................................................................53
Task 16: Assigning material properties and other
parameters....................................................................58
Task 17: Patterning the Fin
................................................................................................................59
Task 18: Making the Slot for the
Fin....................................................................................................60
Task 19: Creating the rocket motor
tube...............................................................................................62
Task 20: Adding motor tube to the rocket assembly
................................................................................64
Task 21: Creating the motor tube bulkhead
..........................................................................................66
Task 21: Assigning material properties and other
parameters....................................................................70
Task 22: Adding the second
bulkhead.................................................................................................70
Lesson five Lesson five Lesson five Lesson five Modelling the
Launch Pad Modelling the Launch Pad Modelling the Launch Pad
Modelling the Launch Pad
................................................................................................................................................................................................................................................................................................................................................................................................
73737373
Learning objectives:
.......................................................................................................................
73
Task 23: Creating the terrain
.............................................................................................................73
Task 24: Now for a bit of Rocket Science
............................................................................................76
Task 24: Ready to Launch
.................................................................................................................79
Task 25: Simulated
Launch................................................................................................................82
Task 26: Additional Activity Suggestions
..............................................................................................86
Appendix AAppendix AAppendix AAppendix
A............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
88888888
How to create new
Materials.............................................................................................................88
Appendix BAppendix BAppendix BAppendix B
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
91919191
How to create a new colour
..............................................................................................................91
Appendix CAppendix CAppendix CAppendix C
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
93939393
How to create the model-rocket motors
................................................................................................93
Learning objectives:
.......................................................................................................................
93
Task C1: Set Working Directory
.........................................................................................................93
Task C2: Modelling the Motor Case
...................................................................................................94
Task C3: Modelling the rocket
nozzle..................................................................................................97
Task C4: Modelling the rocket fuel
grain..............................................................................................99
Task C5: Assembling the Rocket Motor
..............................................................................................100
Task C6: Adding a Component Interface
...........................................................................................101
Task C7: Adding a Datum Point
.......................................................................................................102
Task C8: Defining the Force.
...........................................................................................................103
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Teachers notesTeachers notesTeachers notesTeachers notes
Introduction
The Starchaser Model Rocket Tutorial contains basic,
intermediate and advanced activities aimed at providing Students
with an understanding of the basic Engineering and Scientific
concepts used in the design of model rockets. The range of tasks
within this tutorial demonstrates the integral roles that Physics,
Mathematics and Design & Technology play within the Engineering
process.
During these tutorials Users will learn how to create parts and
assemblies, understand top-down design within Pro|ENGINEER Wildfire
3.0, and explore Mathematic and Scientific concepts via simulated
launches.
This Tutorial and Teacher Resource has been produced as a
collaborative initiative between PTC and Starchaser Industries as
part of the PTC Design & Technology in Schools programme.
Pre-requisites
Pro|ENGINEER Wildfire 3.0 Schools Advanced Edition
or
Pro|ENGINEER Wildfire 3.0 University Plus Edition
This tutorial has been developed to explore some of the advanced
capabilities of Pro|ENGINEER Wildfire 3.0 Schools Advanced Edition;
however the modelling aspects of this tutorial can be conducted in
either the Schools Edition or Schools Advanced Edition
This tutorial contains screen and menu images taken from the
Schools Advanced Edition so Users of other Pro|ENGINEER Editions
may notice some slight differences.
This tutorial has also been based on the use of Pro|ENGINEER
start parts & templates supplied as part of the PTC D&T
programme. While this tutorial can be used with other Pro|ENGINEER
start parts there may be changes required in terms of view
orientation, datum plane and coordinate system references etc.
This tutorial requires a basic to intermediate knowledge and
experience in Pro|ENGINEER.
Pro|ENGINEER Wildfire requires the use of a 3 button mouse. If
possible a mouse with a combined middle wheel & button can
improve User interaction with Pro|ENGINEER Wildfire.
The rocket motors supplied used in this tutorial have been
created in Pro|ENGINEER Schools Advanced Edition and therefore not
compatible with commercial editions.
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Abbreviations and terminology used within this tutorial
Left-click Press and release the left-hand mouse button
Left-click-drag Press and hold-down the left-hand mouse button
and move the mouse
Right-click Press and release the right-hand mouse button
Right-click-drag Press and hold-down the right-hand mouse button
and move the mouse
Middle-click Press and release the middle mouse button
Middle-drag Press and hold-down the middle mouse button and move
the mouse
The aim of the tutorial is to introduce students to the basic
and intermediate solid-modelling and assembly processes and
techniques and analysis functions available in Pro|ENGINEER
Wildfire 3.0.
Installation and setup
These Installation notes have been complied based on a directory
structure used as part of the PTC D&T programme, the UK CAD in
Schools initiative and the deployment of Pro|ENGINEER. Users not
part of this programme can still use this tutorial but may need to
adapt either their Pro|ENGINEER configuration files or the
directory structure used in the tutorial.
The Starchaser Model Rocket Tutorial comes complete with
pre-prepared example parts, assemblies and standard parts and
requires these files to be loaded prior to the tutorial being
delivered.
Copy the rocket_motorsrocket_motorsrocket_motorsrocket_motors
folder into
pro_standards/part_libraries/pro_standards/part_libraries/pro_standards/part_libraries/pro_standards/part_libraries/
Edit the
search_path.prosearch_path.prosearch_path.prosearch_path.pro file
and add the complete directory path name for the rocket_motors
(double click
search_path.prosearch_path.prosearch_path.prosearch_path.pro and
open with WordPad to edit)
Copy the material data supplied with this tutorial to
pro_standards/material_database/pro_standards/material_database/pro_standards/material_database/pro_standards/material_database/
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Pro|ENGINEER functionality addressed in this tutorial.
Sketching
2D geometry creation & modification
Circles, Lines, Rectangles, Arcs, Centrelines, Trimming
Sketch Palette
Sketch References
Mirror sketch geometry
Geometric & dimensional constraints.
Weak, Strong & Locked dimensions
Linear, angular, radial & diameter dimensional
constraints
Geometric constraints, equal, tangent, symmetric.
Geometric relationships (equation driven dimensions)
Modelling
Datum Plane creation
Revolve Feature
Shell Feature
Extrude Feature
Round Feature
Chamfer
Patterning (incl. Reference Patterns)
Warp
Parametric modification
Material properties
Assemblies
Top down assembly modelling
Assembly constraints
Hide/Un-hide components
Component Operations
Component Instances
Analysis
Mass Properties
Definition of a point force
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ICT areas addressed in this tutorial
Modelling
Communication
D&T subject areas addressed in this tutorial
CAD
o Parametric feature based solid-modelling
o Assemblies
STEM related areas addressed in this tutorial
Physics
o Force = mass x acceleration
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BackgroundBackgroundBackgroundBackground
Within the diverse range of engineering disciplines and
industries perhaps one of the most exciting and challenging areas
is aerospace and aeronautical engineering, the epitome of which
must surely by the design and manufacture of spacecraft.
The design of a rocket may look basic in terms of its outer
geometric shape, but the science and engineering required to
produce an aerodynamically stable and light-weight rocket capable
of achieving high altitudes is complex; after all it is Rocket
Science.
This tutorial will covers the design and assembly of the major
components of a model rocket with the subsequent analysis of a
simulated launch.
Starchaser IndustriesStarchaser IndustriesStarchaser
IndustriesStarchaser Industries
Starchaser Industries is a privately held international company
that specialises in the development, operation and
commercialisation of space related products and services.
Starchaser enables new space related business opportunities by
providing safe, reliable, affordable and reusable access to space
for both the space tourism and micro-satellite launch markets.
Starchaser Industries have offices in Las Cruces, New Mexico USA
and are headquartered in Cheshire England. Since being founded in
1992, by current CEO Steven Bennett, Starchaser have launched a
number of reusable launch vehicles (rockets), most notably the NOVA
/ STARCHASER 4 rocket.
Starchaser Industries also have a long established and highly
successful Educational Outreach Programme that engages with both
the general public and education. Starchasers educational
activities complement the national curriculum and help inspire and
motivate students at all levels to pursue careers in the fields of
Science, Technology, Engineering and Mathematics (STEM). Starchaser
provides students with opportunities for involvement in research
and development projects to actively promote the STEM subjects and
encourage them to pursue higher education at the graduate and
doctorate levels.
For more information on Starchaser please visit
www.starchaserplc.co.uk
For more information on Starchasers Educational Outreach
Programme please visit www.space4schools.co.uk
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The Starchaser Model Rocket Tutorial comes complete with
pre-prepared parts, assemblies and standard parts and requires
these files to be loaded prior to the tutorial being delivered. For
a full list of files please refer to Appendix XXX.
Starchaser Industries are a PTC Performance Partner and have
been using PTC solutions since 1999. Initially Starchaser used
Pro|DESKTOP and in 2004 started to deploy Pro|ENGINEER Wildfire.
PTC software is used in all aspects of Starchasers R&D
activities from rocket engines to the airframe of the rockets.
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Lesson one Lesson one Lesson one Lesson one Product Requirement
Product Requirement Product Requirement Product Requirement
Aim:Aim:Aim:Aim:
During this lesson students should investigate the need for
getting into space.
Why do we need to get into space?
o Human Spaceflight
o Satellites
Satellite TV & communication
Earth observation; weather, spy satellites
o Exploration; the Moon, Mars
Where is Space?
Whats the difference between getting into space and getting to
orbit?
Once the reasons for getting into space have been discussed, how
do we get into space?
Learning objectives:Learning objectives:Learning
objectives:Learning objectives:
By the end of this lesson students should:
Be aware of the benefits of space.
Know the milestones in Human spaceflight
Know the difference between being in space and being in
orbit
Know the planets in our Solar system
Understand the need for Rockets
This lesson should explore and investigate the need for access
to space, the history of space flight, and how to get there.
HomeworkHomeworkHomeworkHomework
Research current rocket designs and technology and also
Lesson two Lesson two Lesson two Lesson two
Aim:Aim:Aim:Aim:
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Newton laws of motion
Learning objectives:Learning objectives:Learning
objectives:Learning objectives:
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Lesson three Lesson three Lesson three Lesson three Modelling
the rocket Modelling the rocket Modelling the rocket Modelling the
rocket conceptconceptconceptconcept
Aim:Aim:Aim:Aim:
In this lesson students will learn how to create a 2D concept of
the rocket in Pro|ENGINEER Wildfire 3.0
Learning objectives:Learning objectives:Learning
objectives:Learning objectives:
By the end of this lesson students should:
o Know how to create a new part.
o Be able to create valid sketch geometry.
Lines, centrelines, arcs, and points
Mirror sketch geometry
Define sketch dimensions
o Create basic mathematic relationships between sketch
dimensions.
o Define new Datum Planes
o Assign project information to parts.
o
Task 1: Set working directory
1. Start Pro|ENGINEER Wildfire
2. In the Navigator Window (down the left-hand side of
Pro|ENGINEER) browse to the rocketrocketrocketrocket folder
If the Navigator is not displaying Folders
left-click the Folder tab at the top Navigator Window.
3. Right-click the rocketrocketrocketrocket folder, and in the
menu that appears select Set Working DirectorySet Working
DirectorySet Working DirectorySet Working Directory.
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Task 2: Creating a new Pro|ENGINEER part
4. From the Pro|ENGINEER top toolbar left-click Create New
FilCreate New FilCreate New FilCreate New Fileeee . In the dialog
box that appears enter conceptconceptconceptconcept
Notice that PartPartPartPart is selected as the default
TypeTypeTypeType.
5. Left-click to accept the settings and create the new
Pro|ENGINEER part file
When the part opens you should see the default Datum Planes,
FRONT, TOP & RIGHT, and the default coordinate system
DEFAULT_CSYS displayed in the graphics windows and feature
browser.
For the purposes of this activity the
DEFAULT_CSYSDEFAULT_CSYSDEFAULT_CSYSDEFAULT_CSYS is not
required;
6. From the Pro|ENGINEER top toolbar left-click Coordinate
System on/offCoordinate System on/offCoordinate System
on/offCoordinate System on/off to turn off the display
Task 3: Creating the rocket concept sketch
During this Task you will create the Rocket concept as a simple
2D sketch.
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7. From the Feature Toolbar (down the right-hand side of
Pro|ENGINEER)
select the Sketch ToolSketch ToolSketch ToolSketch Tool .
Before you start sketching, Pro|ENGINEER needs to know where to
place the Sketch and how it is to be oriented. Pro|ENGINEER will
issue a prompt along the bottom of the Pro|ENGINEER
window asking you to:
Pro|ENGINEER will also display the Sketch dialog which captures
the selection of Sketch PlaneSketch PlaneSketch PlaneSketch Plane
and Sketch OrientationSketch OrientationSketch OrientationSketch
Orientation information.
8. In the Pro|ENGINEER Graphics Window move the cursor over the
FRONTFRONTFRONTFRONT datum plane and select it with a left-click.
This will populate the PlanePlanePlanePlane data box.
Pro|ENGINEER will then automatically suggest/select the
TOPTOPTOPTOP datum plane as the
ReferenceReferenceReferenceReference Plane to define the Sketch
Orientation and Sketch view direction.
9. To accept these references and enter the Sketcher select
Once in the Sketcher, Pro|ENGINEER will automatically reorient
the view to look directly
onto the Sketch Plane. If this doesnt happen, from the top
toolbar, left-click to reorient the view.
10. At this point you no longer need to see the Datum Planes or
Datum Axes. In the top
toolbar left-click to turn off the display of Datum Planes and
to turn off the display of Datum Axes.
Based on the selection of the FRONTFRONTFRONTFRONT datum plane
as the sketch plane and the TOPTOPTOPTOP datum plane as the
orientation plane, Pro|ENGINEER has automatically created two
reference lines in the sketch. The reference lines will be used to
position the concept sketch geometry.
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Once in the Sketcher Pro|ENGINEER will display the Sketcher
Toolbar down the right-hand side.
11. From the Sketcher toolbar select
Create LineCreate LineCreate LineCreate Line
12. Sketch a vertical line (as shown to the right); position the
cursor at the position marked XXXX1111 and left-click to start
sketching the line. Now move the cursor upwards to the position
marked XXXX2222, (as you move the cursor the line will follow, keep
the line as close to vertical as possible, you will notice a red
letter VVVV which denotes that Pro|ENGINEER will create a vertical
line). To place the end of the line left-click.
13. To exit Create Line press the middle mouse button once
(middle-click) or left-click Select ItemSelect ItemSelect
ItemSelect Item from the Sketcher toolbar.
14. From the Sketcher Toolbar select Create ArcCreate ArcCreate
ArcCreate Arc .
15. Position the cursor over the upper end of the newly created
line, (Pro|ENGINEER will snap to the end), left click, XXXX1111, to
start the arc and then move the cursor to the position indicated,
XXXX2222, (on the vertical reference line) and left-click to create
the arc.
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The next step is to sketch the fin profile.
16. From the Sketcher toolbar select Create LineCreate
LineCreate LineCreate Line .
17. Position the cursor over the bottom end of the vertical
line, (Pro |ENGINEER will snap to the end), left click, XXXX1111,
to start sketching the fin. Move the cursor onto the horizontal
reference line and left-click at the point indicated by
XXXX2222.
18. Move the cursor upward and create a vertical line with a
left-click at the point indicated by XXXX3333, then move the cursor
onto the vertical line and left-click at position XXXX4444.
Middle-click to exit Create Line
Dont worry about any of the dimension values at this point in
time.
The geometry created up to now defines just one side of the
rocket concept. The next step is to mirror this geometry to
complete the rocket concept sketch.
19. In the Sketcher toolbar left-click the small up-turned
arrow to the right of Create LineCreate LineCreate LineCreate
Line and from the
pull out menu select Create CentrelineCreate CentrelineCreate
CentrelineCreate Centreline .
20. Position the cursor over the vertical reference line and
left-click (XXXX1111) to locate the first point of the centreline,
now move the cursor upwards and left-click again on the vertical
reference line to create the centreline (XXXX2222)
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21. Now select all the rocket geometry (excluding the
centreline). Hold down the Ctrl key to perform multiple
selection.
22. Select Mirror Selected EntitiesMirror Selected
EntitiesMirror Selected EntitiesMirror Selected Entities ,
Pro|ENGINEER
will prompt you to , left-click the newly created
centreline.
Notice how Pro|ENGINEER has added some small arrows to indicate
symmetry.
23. In the Sketcher toolbar left-click the small up-turned
arrow to the right of Create Create Create Create
CentrelineCentrelineCentrelineCentreline , and
select Create Line .
24. Sketch a line across the bottom of the rocket (XXXX1111
& XXXX2222).
Task 4: Dimensioning the Rocket concept sketch
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Pro|ENGINEER has automatically created dimensions to fully
constrain the geometry. These dimensions are typically grey in
colour denoting they are weakweakweakweak dimensions.
Note:Note:Note:Note: There are 3 types of sketch dimension;
LockedLockedLockedLocked the dimension is locked to its value.
This value cannot be modified either directly or indirectly. The
dimension has to be un-locked before its value can be modified.
StrongStrongStrongStrong the dimension can be modified but only
directly by the user
WeakWeakWeakWeak - the dimension can be modified directly (by
explicitly changing the value) or indirectly (by changing other
surrounding dimensions/geometry).
While these weakweakweakweak dimensions fully constrain the
geometry they dont meet the required dimensioning scheme. The next
step is to create the required dimensions.
25. From the Sketcher Toolbar select Create DefinCreate
DefinCreate DefinCreate Defining Dimensioning Dimensioning
Dimensioning Dimension
.
26. The first dimension will define the Rocket diameter;
left-click the left-hand vertical line (XXXX1111) followed by the
right-hand vertical line (XXXX2222), and then position the cursor
below the Rocket and middle-click to place the dimension
(XXXX3333).
NotNotNotNote:e:e:e:
The newly created dimension is a strongstrongstrongstrong
dimension and is Blue. (colours may vary depending on User defined
colour settings)
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27. Left-click the bottom line of the Rocket (XXXX1111) and the
upper end of the vertical line, (XXXX2222), this end point is
referred to as the vertices (the point where two line segments come
together), then move the cursor to the left and middle-click to
place the dimension (XXXX3333)
28. Left-click the end of the vertical line again (XXXX1111) and
then the end point of the arc at the very tip of the Rocket nose
(XXXX2222), move the cursor and middle-click to place the dimension
(XXXX3333).
Notice as you create strong dimensions the weak dimension are
removed automatically to ensure the geometry is not over
constrained.
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29. Using these dimensioning techniques create the remaining
dimensions shown in the image to completely define the Rocket to
the required dimensioning scheme.
Dont worry about the dimension values at this time, these will
be modified later.
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Task 5: Defining a geometric relationship
There are many different types of Rocket nose cone, from a
simple cone to parabolic.
ConicConicConicConic
Tangent OgiveTangent OgiveTangent OgiveTangent Ogive
ParabolicParabolicParabolicParabolic
However one of the most popular nose cones in model rocketry is
the Tangent O-give (pronounced O-jive).
An O-give nose cone has a specific relationship of 3:1 between
the length of the curved nose section to its diameter, i.e. the
nose length is 3 x diameter.
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30. To create this relationship, from the top toolbar, select
ToolsToolsToolsTools>RelationsRelationsRelationsRelations.
Pro|ENGINEER will open the Relations dialog and change the
dimensions into symbolic dimensions, i.e. sd19 (the numbers will
most likely be different in your sketch).
31. To create the required relation first select the length of
the curved section of the nose (sd19 in the above image) and build
up the relation sd19sd19sd19sd19====3*sd153*sd153*sd153*sd15
sd19 is the length of the curved section of the nose cone
sd15 is the overall diameter of the nose cone
32. Left-click to create the new relation.
33. Notice how Pro|ENGINEER modifies the geometry to satisfy
this new relationship.
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Task 6: Assigning the required dimension values
During the creation of the Rocket concept sketch no specific
dimensional values were assigned. The next step is to modify the
dimensions to the required values.
34. In the Sketcher Toolbar select Select Items Select Items
Select Items Select Items .
35. Double-left-click each dimension value in turn and enter the
required dimensions as shown in the adjacent image. After entering
the value hit the Return key to enter the value.
NoteNoteNoteNote: you will be unable to modify the nose length
dimension as this is driven by the geometric relationship defined
in the previous task.
To help in possible future modelling operations the next step is
to add a couple of points to the rocket sketch.
36. From the Sketcher toolbar select Create PointCreate
PointCreate PointCreate Point . Left-click at the points indicated
(XXXX1111 & XXXX2222) to create the required points.
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The Rocket concept sketch is now complete.
37. To accept and exit the Sketcher, left-click Accept
SketchAccept SketchAccept SketchAccept Sketch .
38. At this point save the part; from the top toolbar select
Save Save Save Save FFFFileileileile and in the Save dialog select
.
Task 7: Adding a Datum Planes to the concept
To help in the creation and assembly of the individual rocket
components the next step is to add additional Datum Planes.
39. From the feature toolbar down the right-hand side of
Pro|ENGINEER select the Datum Plane ToolDatum Plane ToolDatum
Plane ToolDatum Plane Tool .
Pro|ENGINEER will now prompt you to select up to 3 references to
locate the new Datum Plane.
40. Select the TOPTOPTOPTOP Datum Plane (XXXX1111), then hold
down the Ctrl key and select the end of the vertical line where the
arc of the nose cone meets the fuselage (XXXX2222)
41. In the Datum Plane dialog box select the
PropertiesPropertiesPropertiesProperties tab and enter
NOSENOSENOSENOSE for the name.
42. Pro|ENGINEER now has enough information to create and
position the new Datum Plane, left-click .
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The next step is to repeat this process to create a new Datum
Plane at the base of the fuselage.
43. From the feature toolbar down the right-hand side of
Pro|ENGINEER select the Datum Plane Datum Plane Datum Plane Datum
Plane
ToolToolToolTool .
Pro|ENGINEER will now prompt you to select up to 3 references to
locate the new Datum Plane.
44. Select the TOPTOPTOPTOP Datum Plane (XXXX1111), then in
Datum Plane dialog position the cursor over References
(TOP:F2(DATUM PLANETOP:F2(DATUM PLANETOP:F2(DATUM PLANETOP:F2(DATUM
PLANE) and left-click to display the options.
45. left-click the up-turned arrow and select
ParallelParallelParallelParallel. This will make the new Datum
Plane parallel to the TOP Datum Plane.
46. Now hold down the Ctrl key and select the horizontal line
which represents the bottom of the fuselage (XXXX2222).
47. In the Datum Plane dialog box select the
PropertiesPropertiesPropertiesProperties tab and enter ENDENDENDEND
for the name.
Pro|ENGINEER now has enough information to create and position
the new Datum Plane, left-click .
48. At this point save the part; from the top toolbar select
Save Save Save Save FFFFileileileile and in the Save dialog select
.
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Task 8: Assigning parameters
While the rocket concept is finished, in that its geometric form
is complete, Pro|ENGINEER can capture other information which is a
critical part of the design and engineering process. For this
concept part this information will be project information.
49. From the Pro|ENGINEER top toolbar left-click
ToolsToolsToolsTools and from the pull-down menu select
ParametersParametersParametersParameters.
50. In the Parameter dialog fill in the Values for DESCRIPTION,
MODELLED_BY and PROJECT. Click to accept your parameters.
51. The Rocket Concept part is now finished. At this point save
the part; from the top toolbar select Save Save Save Save
FFFFileileileile and in the Save dialog select .
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Lesson four Lesson four Lesson four Lesson four Top Down Design
Top Down Design Top Down Design Top Down Design
Aim:Aim:Aim:Aim:
In this lesson students will learn how to undertake Top Down
Design in Pro|ENGINEER Wildfire 3.0 and create rocket
components
Learning objectives:Learning objectives:Learning
objectives:Learning objectives:
By the end of this lesson students should:
o Understand Top Down Design
o Know how to create an assembly.
o Know how to add existing parts to an assembly
o Know how to create a new component in assembly mode
o Be able to reference geometry from one part to create
another.
Sketch references
Component Operations
o Understand what sketch based and direct features are.
Extrude, Revolve, Round, Chamfer, Shell
Patterns and Reference Patterns
o Assign material properties and project information to
parts
o Change the appearance of parts (colour)
o Perform a parametric change and update the assembly and its
components.
In industry, it is often best practice to use what is called Top
Down Design; this is where a product is developed from a basic top
level concept. Each component part of the final product is
typically related in some way to the overall product, for example:
a bottle screw cap is related to the diameter of the bottle
top.
Top Down Design allows designers and engineers to tie
interrelated components together so that if one changes the related
components also change. This powerful technique can help maximise
the benefits of parametric solid-modelling and assembly modelling
where individual components can be designed within the context of
the overall assembly.
The first series of Tasks created the 2D layout, or concept of
the model rocket, this together with datum planes and datum axes
can be used to design and control the individual components such as
the nose cone, the fuselage and so on.
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Task 9: Creating an Assembly
In this Task you will create the top-level assembly for the
rocket and add the 2D concept part.
52. From the Pro|ENGINEER top toolbar left-click Create New
FileCreate New FileCreate New FileCreate New File . In the dialog
box that appears enter rocketrocketrocketrocket
53. Letf-click AssemblyAssemblyAssemblyAssembly to define this
new file as an assembly.
Left-click to accept the settings and create the new
Pro|ENGINEER assembly file
When the assembly opens you may see the default Datum Planes,
ASM_FRONT, ASM_TOP & ASM_RIGHT, and the default coordinate
system ASM_DEF_CSYS displayed in the graphics windows and feature
browser.
For the purposes of this activity the
DEFAULT_CSYSDEFAULT_CSYSDEFAULT_CSYSDEFAULT_CSYS is not
required;
54. From the Pro|ENGINEER top toolbar left-click Coordinate
System on/offCoordinate System on/offCoordinate System
on/offCoordinate System on/off to turn off the display
55. If the Datum Planes arent visible left-click Datum
PlaneDatum PlaneDatum PlaneDatum Planes on/offs on/offs on/offs
on/off to toggle on their display
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Task 10: Adding the concept part to the assembly
56. From the assembly toolbar down the right-hand side of
Pro|ENGINEER select
Add ComponentAdd ComponentAdd ComponentAdd Component .
57. In the dialog box that appears select
conceptconceptconceptconcept.prt.prt.prt.prt then left-click .
Pro|ENGINEER will preview the concept part within the assembly
and display the assembly dashboard along the bottom of the
Pro|ENGINEER window.
The Dashboard displays the various assembly options, properties,
status and prompts.
Pan / Drag:
The newly added component can be moved around within the
assembly using the mouse buttons and the Crtl/Alt keys. Spin:
Pro|ENGINEER now needs to be told where to place the newly added
part
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58. In the Dashboard left-click over
AutomaticAutomaticAutomaticAutomatic and
select .
This will position the concept part in the
DDDDefaultefaultefaultefault location, where the X0Y0Z0 of the part
is positioned on the X0Y0Z0 of the assembly.
59. To accept this assembly location left-click at the
right-hand side of the Dashboard.
At this point you dont need to see the Assembly Datum Planes,
ASM_RIGHT, ASM_TOP & ASM_FRONT, or the assembly Datum Axis
ASM_DEF_CSYS.
60. In the Model Tree (down the left-hand side of Pro|ENGINEER)
select these Assembly Datum Planes and Axis (for multiple select
hold down the Ctrl key).
61. Once selected right-click, and from the menu select
HideHideHideHide. Pro|ENGINEER will hide these Datums in the
graphics window and indicate they are hidden by changing the model
tree icons.
62. At this point save the assembly; from the top toolbar select
Save Save Save Save FFFFileileileile and in the Save dialog select
.
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Task 11: Creating the rocket fuselage
The fuselage (from the French fusel spindle-shaped) is the main
body of either an aircraft or rocket. In larger rockets this
section is often referred to as the booster
When using top down design you create the part within the
assembly.
63. From the Pro|ENGINEER feature tool bar select
Create a Component in Assembly ModeCreate a Component in
Assembly ModeCreate a Component in Assembly ModeCreate a Component
in Assembly Mode
64. In the Component Create dialog enter
fuselagefuselagefuselagefuselage for the Name and left-click .
Pro|ENGINEER will open up the Create Options dialog.
ImportantImportantImportantImportant: Make sure the Copy
FromCopy FromCopy FromCopy From field shows the required template
part. This tutorial has been developed to use
solid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prt
within the pro_standards directory.
65. If this template is not in the Copy From field left-
click
66. In the Choose TemplateChoose TemplateChoose TemplateChoose
Template dialog that appears select
solid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prt
and left-click .
67. Once youve selected the correct template, in the Create
Options dialog left-click
.
If this file isnt visible you can navigate to the file within
the Choose Template dialog.
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Pro|ENGINEER will now create a new part and add it to the
assembly.
68. You will notice a new set of Datum Planes in the graphics
window. Hold down the CtrlCtrlCtrlCtrl and AltAltAltAlt keys and
right-click-drag to move the new Fuselage part within the
assembly.
Pro|ENGINEER will also display the component placement Dashboard
along the bottom the window.
The Fuselage part now needs to be located within the assembly.
This will be accomplished by aligning Datum Planes.
69. In the graphics window select the TOPTOPTOPTOP Datum Plane
(XXXX1111) of the Fuselage part followed by the ENDENDENDEND Datum
plane (XXXX2222) of the Concept part.
Depending on how close these two Datum Planes are Pro|ENGINEER
will determine a suitable assembly constraint.
The required result is to align both Datum Planes with no offset
(i.e. coincident).
The Dashboard can be used to set the required assembly
constraint options.
70. In the Dashboard make sure the AlignAlignAlignAlign option
is selected and the constraint
alignment setting is
CoincidentCoincidentCoincidentCoincident
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71. Now select the FRFRFRFRONTONTONTONT Datum Plane of the
Fuselage part followed by the FRONTFRONTFRONTFRONT Datum Plane of
the Concept. Again ensuring the Dashboard options are
AlignAlignAlignAlign and
CoincidentCoincidentCoincidentCoincident.
As assembly constraints are defined Pro|ENGINEER will indicate
the status; at this point this will indicate STATUS: Partially
ConstrainedSTATUS: Partially ConstrainedSTATUS: Partially
ConstrainedSTATUS: Partially Constrained
72. Now select the RIGHTRIGHTRIGHTRIGHT Datum Plane of the
Fuselage part and the RIGHTRIGHTRIGHTRIGHT Datum Plane of the
Concept part. Again ensuring the Dashboard options are
AlignAlignAlignAlign and
CoincidentCoincidentCoincidentCoincident.
Pro|ENGINEER now has sufficient information to change the status
to Fully ConstrainedFully ConstrainedFully ConstrainedFully
Constrained.
73. To accept and finish locating the Fuselage within the
assembly left-click AcceptAcceptAcceptAccept from the far
right-hand side of the Dashboard.
NoteNoteNoteNote: If at any point during the definition of
assembly constraints you inadvertently perform a middle-click
Pro|ENGINEER will see this as an Accept ( ), and take you out of
component placement.
The component will not be fully constrained, as indicated in the
Model Tree by a small
rectangle appearing in front of the component name: .
To return to component placement and complete the definition of
assembly constraints go to the Model Tree and right-click
FUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRT, from menu that
appears select Edit DefinitionEdit DefinitionEdit DefinitionEdit
Definition. This will open up that Dashboard.
From the top line of the Dashboard select
PlaPlaPlaPlacementcementcementcement, this will open up the
placement properties dialog
Left-click New Constraint and then select the required Datum
Planes to complete the assembly placement of
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the Fuselage.
When finished left-click AcceptAcceptAcceptAccept
74. At this point save the assembly; from the top toolbar select
Save Save Save Save FFFFileileileile and in the Save dialog select
.
Now that the new empty Fuselage part has been placed in the
assembly the Fuselage geometry can be created. At the moment every
action is being performed in the assembly, the Fuselage geometry
needs to be created in the Fuselage part.
75. In the Model Tree right-click the
FUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRT and from the menu
that appears select ActivateActivateActivateActivate. Pro|ENGINEER
will change the display of the component within the Model Tree to
indicate the Fuselage part is active by display a small green
diamond
on the graphic; .
The rocket fuselage will be created with an Extrude Feature. An
Extrude is a sketch-based feature and will use a circle which
references the rocket 2D concept.
76. From the feature toolbar select CreaCreaCreaCreate Sketchte
Sketchte Sketchte Sketch .
77. Pro|ENGINEER will prompt you to
. In the Model Tree select the TOPTOPTOPTOP Datum Plane in
FUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRT. (to expand
FUSELAGE.PRT select the ++++ in front of the graphic, as per
standard Windows navigation)
Pro|ENGINEER will automatically suggest/select the
FRONTFRONTFRONTFRONT datum plane as the
ReferenceReferenceReferenceReference Plane to define the Sketch
Orientation and Sketch view direction.
78. To accept these references and enter the Sketcher select
Pro|ENGINEER will now reorient the view to look directly onto
the Sketch plane and also create two Sketch Reference lines. To
help in the creation of the fuselage sketch the view needs to be
Isometric.
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79. From the top toolbar select Saved View ListSaved View
ListSaved View ListSaved View List and from the menu that appears
select either IsometricIsometricIsometricIsometric or
TrimetricTrimetricTrimetricTrimetric.
To enable the sketch geometry to reference the 2D rocket concept
the geometry needs to be brought into the active sketch as a Sketch
Reference.
80. The Datum Planes can be turned off, left-click Datum Datum
Datum Datum
Planes on/offPlanes on/offPlanes on/offPlanes on/off .
81. From the Pro|ENGINEER top toolbar select
SketchSketchSketchSketch and in the pull-down menu that appears
select ReferencesReferencesReferencesReferences.
Pro|ENGINEER will open the Sketch References dialog.
Move the cursor over the where one of the points are,
Pro|ENGINEER will pre-highlight the point (you may need to look
closely).
82. Left-click the point to create the required Sketch Reference
(XXXX1111) and repeat the process for the second point
(XXXX2222).
83. In the Sketch Reference Dialog left-click .
84. From the Sketcher toolbar select
Create CircleCreate CircleCreate CircleCreate Circle .
85. To Sketch the circle position the cursor over the
intersection of the two Reference lines and left-click (XXXX1111),
this will be the circle centre. Now move the cursor over one of the
points and left-click to create the circle (XXXX2222).
The sketch is now complete.
86. To accept and exit the Sketcher, left-
click Accept SketchAccept SketchAccept SketchAccept Sketch .
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The next step is to extrude the circle.
87. From the feature toolbar (down the right-hand side of
Pro|ENGINEER), select ExtrudeExtrudeExtrudeExtrude .
Pro|ENGINEER will automatically preview the extrude and display
the feature Dashboard.
The fuselage extrude will also be linked to the 2D rocket
concept sketch.
88. In the Dashboard select the small up-turned
arrow next to the extrude depth option and from the options
select Extrude to Extrude to Extrude to Extrude to
selected point, plane or surfaceselected point, plane or
surfaceselected point, plane or surfaceselected point, plane or
surface .
89. Move the cursor to the end of the 2D rocket concept line,
(Pro|ENGINEER will pre-highlight the vertex), and left-click
(XXXX1111) to select it.
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At this stage the fuselage extrude is solid but the final
fuselage needs to be hollow. There are a number of ways to achieve
this result:
o Complete the Extrude Feature and then apply a Shell
Feature
o Sketch two concentric circles for the extrude
o Use the Thin option
o The Thin option creates an extrude with a thin wall; within
this Thin Extrude Feature the wall thickness can be defined either
internally, externally of symmetrical about the defining
sketch.
90. In the Extrude Feature Dashboard select the ThinThinThinThin
option
The Extrude Feature Dashboard will change to show the different
options for creating a Thin Extrusion.
While the required wall thickness is 1mm it is often a good idea
to enter a larger value so you can see in which direction the Thin
is being applied. In this case enter 10mm
91. To step through the different offset direction left-click
Change Change Change Change
DirectionDirectionDirectionDirection . The required offset is
inside.
92. Once the direction is correct enter a wall thickness of
1mm1mm1mm1mm.
93. To complete the Extrude Feature select Accept FeatureAccept
FeatureAccept FeatureAccept Feature at the far right-hand side of
the Dashboard.
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This stage of the Fuselage design is complete and the geometry
has been created within the Rocket assembly and linked to the 2D
rocket concept.
94. In the Model Tree right-click the FUSELAGE.PRT and from the
menu options that appear select OpenOpenOpenOpen.
Pro|ENGINEER will Open FUSELAGE.PRT as a separate file, i.e.
outside of the assembly.
Task 12: Assigning material properties and other parameters
The next step is to assign material and project information.
95. From the Pro|ENGINEER top toolbar select EditEditEditEdit
and in menu that appears select SetupSetupSetupSetup
96. In the Menu Manager that appears (on the right-hand side of
the screen) select MaterialMaterialMaterialMaterial.
Pro|ENGINEER will open up the Materials menu.
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97. In the Materials menu select
cardboardcardboardcardboardcardboard.
98. To assign it to the model left-click the right pointing
triple arrow , followed by and then in the Menu Manager select
DoneDoneDoneDone.
NoteNoteNoteNote: If you cant see cardboard in the list of
available materials please refer to Appendix XXAppendix XXAppendix
XXAppendix XX
While the rocket fuselage is finished, in that its geometric
form is complete, Pro|ENGINEER can capture other information which
is a critical part of the design and engineering process. For this
concept part this information will be project information.
99. From the Pro|ENGINEER top toolbar left-click
ToolsToolsToolsTools and from the pull-down menu select
ParametersParametersParametersParameters.
100. In the Parameter dialog fill in the Values for DESCRIPTION,
MODELLED_BY and
PROJECT. Click to accept your parameters.
101. The Rocket Fuselage part is now finished. At this point
save the part; from the top toolbar select Save Save Save Save
FFFFileileileile and in the Save dialog select .
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Task 13: Modelling the rocket nose cone
The next task is to model the nose cone, again within context of
the rocket assembly.
102. In the Pro|ENGINEER top toolbar left-click
WindowWindowWindowWindow and selet
ROCKET.ASMROCKET.ASMROCKET.ASMROCKET.ASM. This will display the
rocket assembly window.
NOTENOTENOTENOTE: When you have more than one Pro|ENGINEER part
and/or assembly open always use the above method for switching
between parts. This ensures that Pro|ENGINEER synchronises the part
being displayed to the User menu/actions .
Do NOTNOTNOTNOT select the parts from the Microsoft Windows
Taskbar along the bottom of your screen.
103. Toggle on the Datum Plane display .
104. From the Pro|ENGINEER feature tool bar select
Create a Component in Assembly Mode Create a Component in
Assembly Mode Create a Component in Assembly Mode Create a
Component in Assembly Mode .
105. In the Component Create dialog enter
nose_conenose_conenose_conenose_cone for the Name and left-click
.
Pro|ENGINEER will open up the Create Options dialog.
As when creating the Fuselage component: Make sure the Copy
FromCopy FromCopy FromCopy From field shows the required template
part. This tutorial has been developed to use
solid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prt
within the pro_standards directory.
106. Once youve selected the correct template, in the Create
OptionsCreate OptionsCreate OptionsCreate Options dialog left-click
.
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Pro|ENGINEER will now create a new part and add it to the
assembly.
107. You will notice a new set of Datum Planes in the graphics
window. Hold down the CtrlCtrlCtrlCtrl and AltAltAltAlt keys and
right-click-drag to move the new nose_cone part within the
assembly.
Pro|ENGINEER will also display the component placement Dashboard
along the bottom the window.
The nose_cone part now needs to be located within the assembly.
As with the Fuselage, this will be accomplished by aligning Datum
Planes.
108. In the graphics window select the TOPTOPTOPTOP Datum Plane
(XXXX1111) of the nose_cone followed by the NOSENOSENOSENOSE Datum
Plane (XXXX2222) of the Concept part.
Depending on how close these two Datum Planes are Pro|ENGINEER
will determine a suitable assembly constraint.
The required result is to align both Datum Planes with no offset
(i.e. coincident)
The Dashboard can be used to set the required assembly
constraints.
109. In the Dashboard make sure the AlignAlignAlignAlign option
is selected and the constraint
alignment setting is
CoincidentCoincidentCoincidentCoincident
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110. Now select the FRONTFRONTFRONTFRONT Datum Plane of the
nose_cone part and the FRONTFRONTFRONTFRONT Datum Plane of the
Concept part. Again ensuring the Dashboard options are
AlignAlignAlignAlign and
CoincidentCoincidentCoincidentCoincident.
111. Finally select the RIGHTRIGHTRIGHTRIGHT Datum Plane of the
nose_cone part and the RIGHTRIGHTRIGHTRIGHT Datum Plane of the
Concept part. Once more ensuring AlignAlignAlignAlign and
CoincidentCoincidentCoincidentCoincident.
112. To accept and finish locating the nose_cone left-click
AcceptAcceptAcceptAccept for the far right of the Dashboard.
113. At this point save the assembly; from the top toolbar
select Save Save Save Save FFFFileileileile and in the Save dialog
select .
The next step is to create the nose cone geometry. Pro|ENGINEER
is currently active in the assembly so the NOSE_CONE.PRT needs to
be activated
114. In the Model Tree right-click the
NOSE_CONENOSE_CONENOSE_CONENOSE_CONE.PRT.PRT.PRT.PRT and from the
menu that appears select ActivateActivateActivateActivate.
Pro|ENGINEER will change the display of the compoent within the
Model Tree to indicate the Fuselage part is active by display a
small green diamond
on the graphic; .
The nose cone will be created using a Revolve Feature. A Revolve
is a sketch-based feature and will use a 2D profile based which
will reference both the concept geometry and the fuselage.
115. From the feature toolbar select Create SketchCreate
SketchCreate SketchCreate Sketch .
116. Pro|ENGINEER will prompt you to
. In the Model Tree select the FRONTFRONTFRONTFRONT Datum Plane
in NOSE_CONENOSE_CONENOSE_CONENOSE_CONE.PRT.PRT.PRT.PRT. (to expand
NOSE_CONE.PRT
select the ++++ infront of the graphic, as per standard Windows
navigation)
Pro|ENGINEER will automatically suggest/select the TOPTOPTOPTOP
datum plane as the ReferenceReferenceReferenceReference Plane to
define the Sketch
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Orientation and Sketch view direction.
117. To accept these references and enter the Sketcher
select
Pro|ENGINEER will now reorient the view to look directly onto
the Sketch plane and also create two Sketch Reference lines.
At this point the Datum Planes are no longer required.
118. Left-click Datum Planes on/offDatum Planes on/offDatum
Planes on/offDatum Planes on/off .
The nose cone will directly reference geometry within the 2D
concept and the fuselage model.
119. To help in the selection of the required reference geometry
zoom in to the nose and
from the Top Toolbar left-click Wireframe HiddenWireframe
HiddenWireframe HiddenWireframe Hidden to change the the view
display
120. From the Top Toolbar select
Sketch>ReferencesSketch>ReferencesSketch>ReferencesSketch>References
and move the cursor over the fuselage model until the inner edge
highlights and the left-click (XXXX1111). This will create a new
reference line in the nose cone part which will always be linked to
the fuselage via the assembly.
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The next step is to bring the arc for the nose cone into the
sketch nose cone.
121. From the Feature Toolbar select Create Entity from
EdgeCreate Entity from EdgeCreate Entity from EdgeCreate Entity
from Edge and select the arc (XXXX1111), then in the
TypeTypeTypeType dialog select close.
In industry there is often a difference between the design
concept and the actual manufactured component. For example in the
case of the nose cone, the 2D concept has the nose coming to a
sharp point, however to manufacture the mould tool required to
create a plastic nose cone with such a sharp point would difficult
and costly. Also such a sharp point would soon become damaged
during use.
Manufacture of the nose cone mould tool would be easier if the
nose didnt come to such a sharp point and as long as the
aerodynamic properties werent compromised the design change is
acceptable. This type of design change is often referred to as
Design for Manufacture and is an important part of the engineering
process.
Using the Top Down approach the nose cone production part can be
modelled to better suit manufacturing and in-service requirements.
In this case this means adding a small round on the nose cone
point.
122. From the sketch toolbar select Create Circle
.
123. Poisition the cursor over the vertical reference line just
below the point of the 2D nose cone and left-click to position the
circles centre (XXXX1111). Move the cursor onto the arc until you
see TTTT which indicate a Tangent constraint will be created, and
left click to create the circle (XXXX2222).
124. From the sketch toolbar left-click Select ItemsSelect
ItemsSelect ItemsSelect Items
to exit Create Cirlce.
Dont worry about the dimension just yet.
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To achieve the required result some geometry needs to be
removed.
125. From the Sketch Toolbar select Dynamically Dynamically
Dynamically Dynamically
Trim section entitiesTrim section entitiesTrim section
entitiesTrim section entities (often referred to as Squiggle
Trim).
Pro|ENGINEER will display small dots which indicate geometry
segments, i.e. the geometry between the dots. The Squiggle Trim
will remove any segment geometry.
126. Left-click-drag and move the cursor over each of the line
segments that needs to be removed/trimmed, (as shown).
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The next step is to sketch the part of the nose cone that will
attach it to the fuselage. In this case the nose cone will have a
slide fit into the fuselage.
In model rocketry the parachute is typically deployed from the
top of the fuselage: The rocket motor propells the rocket skyward
and when all the rocket propellant is consumed the rocket continus
to coast upward.
The rocket motor has a small delay composition which starts
burning leaving a trail of smoke to help track your rocket. When
the delay composition is fully consumed it ignites whats called the
ejection charge. This fast burning ejection charge overpressurises
the fuselage and pushes the nose cone off and the parachute
out.
It is therefore important that the nose cone fits nicely into
the fuselage.
127. Zoom into the area around the top of the fuselage.
128. From the Sketch Toolbar Select Create LineCreate LineCreate
LineCreate Line
.
129. Start the line at the end of the main nose cone arc
(XXXX1111) and then move along the horizontal reference line
(XXXX2222) (futher inside the fuselage reference line), then
vertcally down (XXXX3333) and then horizontally onto the main
vertical reference line (XXXX4444).
130. While still in Create Line, zoom out so you can see the top
of the nose cone and select the end of the small arc
(XXXX5555).
131. From the Sketch Toolbar left-click Select ItemsSelect
ItemsSelect ItemsSelect Items to exit Create Line.
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The nest step is to create the required dimensioning scheme with
the correct values.
132. From the Sketch tollbar select Create Defining
Diemnsions ad using the same techniqes used to dimension the
Rocket Concept create the required dimensions with the correct
values.
The dimension between the inside of the fuselage and the nose
cone insert is set to 0.25mm0.25mm0.25mm0.25mm, this will allow the
nose cone to slide in and out of the fuselage.
As the nose cone geometry references the fuselage geometry if
the fuselage changes diameter so will the nose cone.
The nose cone point has a radius of 1.5mm1.5mm1.5mm1.5mm, this
will still produce an aerodynamic nose cone but without the sharp
point.
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The last thing to do is create a centreline.
133. From the Sketcher toolbar left-click the small up-turned
arrow
to the right of Create LineCreate LineCreate LineCreate Line and
from the pull-out menu
select Create CentrelineCreate CentrelineCreate CentrelineCreate
Centreline .
134. Create the Centreline along the main vertical reference
line (XXXX1111XXXX2222).
The nose cone sketch is now complete.
135. From the Sketch Toolbar left-click Accept SketchAccept
SketchAccept SketchAccept Sketch
136. From the Feature Toolbar select
RevolveRevolveRevolveRevolve .
Pro|ENGINEER will automatically preview the Revolve and display
the feature Dashboard.
(If nothing happens, select the newly created sketch, if nothing
happens you may need to go back into the sketch using Edit
Definition and check the sketch profile.)
137. To complete the Revolve Feature select Accept FeatureAccept
FeatureAccept FeatureAccept Feature at the far right-hand side of
the Dashboard.
The next step is to add additional features to the nose cone.
These features can be created outside of the assembly.
138. In the Model Tree right click and from the pull-down menu
select ActivateActivateActivateActivate.
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The next step is to change the colour of the nose cone.
139. From the Pro|ENGINEER Top Toolbar select ViewViewViewView
and from
the pull down menu select .
140. Select the desired colour from the list followed by .
141. To close the Appearance Editior select
For information on how to create colours please refer to For
information on how to create colours please refer to For
information on how to create colours please refer to For
information on how to create colours please refer to Appendix
BAppendix BAppendix BAppendix B
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To aid insertion of the nose cone into the fuselage a small
radius will be added to the insert section.
142. From the Feature Toolbar select RoundRoundRoundRound
143. Left-click the bottom edge of the nose cone and set the
value to 2222mmmmmmmm
144. To complete the Round Feature select Accept FeatureAccept
FeatureAccept FeatureAccept Feature at the far right-hand side of
the Dashboard.
At the moment the nose cone is solid. The required nose is
hollow.
145. From the Feature Toolbar select ShellShellShellShell . Make
sure no geometry is select to ensure the Shell will be applied to
the entire nose cone. Enter a value of 1.5mm1.5mm1.5mm1.5mm for the
shell thickness and make sure its applied to the inside of the
nose.
146. To complete the Round Feature select Accept FeatureAccept
FeatureAccept FeatureAccept Feature at the far right-hand side of
the Dashboard.
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Task 14: Assigning material properties and other parameters
The next step is to assign material and project information.
147. From the Top Toolbar select EditEditEditEdit and in the
menu that appears select SetupSetupSetupSetup
148. In the Menu Manager select
MaterialMaterialMaterialMaterial
149. Pro|ENGINEER will open up the Material menu. Select
LDPE.mat (Low Density PolyEthelen).
150. To assign the material to the model left-click the right
pointing
tripple arrow , followed by and then in the Menu Manager select
DoneDoneDoneDone.
151. From the Top Toolbar select ToolsToolsToolsTools and from
the menu select ParametersParametersParametersParameters....
152. In the Parameter dialog enter the values for DESCRIPTION,
MODELLED_BY and PROJECT. Left-click to accept the parameters.
153. The Rocket Nose Cone part is now finished. At this point
save the part; from the top toolbar select Save Save Save Save
FFFFileileileile and in the Save dialog select .
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Task 15: Modelling the Fins
When designing a rocket one of the most important issues is
rocket stability. In the large commercial rocket this is achieved
with active guidance which in some case is where the rocket engine
moves to influence the direction of flight.
In model rocketry stability is usually achieved by adding Fins.
The fins provide what is called passive stability. Fins provide
stability by using the air that flows over them during flight to
keep the rocket flying stable.
While there are a number of other important issues relating to
rocket stability, such as Centre-of-Gravity and Centre-of-Pressure,
we will ignore these for the purposes of this tutorial.
154. In the Pro|ENGINEER top toolbar left-click
WindowWindowWindowWindow and selet
ROCKET.ASMROCKET.ASMROCKET.ASMROCKET.ASM. This will display the
rocket assembly window.
NOTENOTENOTENOTE: When you have more than one Pro|ENGINEER part
and/or assembly open always use the above method for switching
between parts. This ensures that Pro|ENGINEER synchronises the part
being displayed to the User menu/actions .
Do NOTNOTNOTNOT select the parts from the Microsoft Windows
Taskbar along the bottom of your screen.
155. Toggle on the Datum Plane display .
The rocket fins will be created in the same manner as the
fuselage and nose cone, within the context of the assembly.
At this stage we dont need to see the nose cone or the
fuselage.
156. In the Model Tree right-click on
FUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRTFUSELAGE.PRT and from the menu
select HideHideHideHide.
157. Repeat this process for the
NOSE_CONE.PRTNOSE_CONE.PRTNOSE_CONE.PRTNOSE_CONE.PRT and the
assembly Datum Planes.
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158. From the Pro|ENGINEER feature tool bar select
Create a Component in AsCreate a Component in AsCreate a
Component in AsCreate a Component in Assembly Modesembly Modesembly
Modesembly Mode .
In the Component Create dialog enter finfinfinfin for the Name
and left-click .
Pro|ENGINEER will open up the Create Options dialog.
As when creating the Fuselage & nose cone components: Make
sure the Copy FromCopy FromCopy FromCopy From field shows the
required template part. This tutorial has been developed to use
solid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prtsolid_start_part_mm.prt
within the pro_standards directory.
Once youve selected the correct template, in the Create
OptionsCreate OptionsCreate OptionsCreate Options dialog left-click
.
159. Pro|ENGINEER will now create the new part and add it to the
assembly. Using the same techniques used to assemble the fuselage
part into the assembly select the relevant Datumn Planes pairs:
Fin TOPTOPTOPTOP Datum Plane to Concept ENDENDENDEND Datum Plane
(AlignAlignAlignAlign &
CoincidentCoincidentCoincidentCoincident)
Fin FRONTFRONTFRONTFRONT Datum Plane to Concept
FRONTFRONTFRONTFRONT (AlignAlignAlignAlign &
CoincidentCoincidentCoincidentCoincident)
Fin RIGHTRIGHTRIGHTRIGHT Datum Plane to Concept
RIGHTRIGHTRIGHTRIGHT (AlignAlignAlignAlign &
CoincidentCoincidentCoincidentCoincident)
160. To accept and finish locating the new Fin part within the
assembly left-click AcceptAcceptAcceptAccept .
161. In the Model Tree right-click the
FINFINFINFIN.PRT.PRT.PRT.PRT and from the menu that appears select
ActivateActivateActivateActivate. Pro|ENGINEER will change the
display of the component within the Model Tree to indicate the
Fuselage part is active by display a small green diamond
on the graphic;
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The Fin will be created using a Extrude Feature. An Extrude is a
sketch-based feature and will use a 2D profile based which will
reference both the concept geometry.
162. From the feature toolbar select Create SketchCreate
SketchCreate SketchCreate Sketch .
163. Pro|ENGINEER will prompt you to Select the
FRONTFRONTFRONTFRONT Datum Plane in
FINFINFINFIN.PRT.PRT.PRT.PRT. (to expand FIN.PRT select the ++++
infront of the graphic, as per standard Windows navigation)
Pro|ENGINEER will automatically suggest/select the TOPTOPTOPTOP
datum plane as the ReferenceReferenceReferenceReference Plane to
define the Sketch
164. From the Feature Toolbar select Create Entity from Create
Entity from Create Entity from Create Entity from
EdgeEdgeEdgeEdge and select the fin geometry indicated
(XXXX1111, X, X, X, X2222, , , ,
XXXX3333), then in the TypeTypeTypeType dialog select .
The Fin will attach to the fuselage with a tab that will be
inserted into a slot down the side of the fuselage (not yet
modelled).
165. Sketch the tab geometry as shown using Create LineCreate
LineCreate LineCreate Line
.
The tab will be controlled by both geometric and dimensional
constraints.
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166. In the Sketch Toolbar select Impose Sketch
ConstraintsImpose Sketch ConstraintsImpose Sketch ConstraintsImpose
Sketch Constraints
.
167. In the Constraints dialog select Create Equal LengthsCreate
Equal LengthsCreate Equal LengthsCreate Equal Lengths and select
the two small verical lines (XXXX1111, XXXX2222), and
left-click .
168. In the Sketch Toolbar select Create Defining Create
Defining Create Defining Create Defining
DimensionsDimensionsDimensionsDimensions and add the two
dimension shown.
The use of geometric constraints ensures the tab will remain
central to the Fin.
169. The Fin sketch is now complete, from the Sketch
Toolbar left-click Accept SketchAccept SketchAccept SketchAccept
Sketch .
The next step is to extrude the sketch into a solid.
170. To help see the extrude better change the view orientation
to either Isometric or Trimetric.
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171. From the Feature Toolbar select Extrude Feature .
Pro|ENGINEER automatically preview the extrude an open the
feature Dashboard.
The solid needs to be extruded each side of the sketch to create
the required Fin.
172. In the feature Dashboard change the depth options to
Sym