Cad-cam Lab Manual (F)

SREC/CAD-CAM LAB MANUAL Page 1

CAD/CAM Laboratory

Instruction Manual

SRI RAMAKRISHNA ENGINEERING COLLEGE DEPARTMENT OF MECHANICAL ENGINEERING

COIMBATORE-641022

Name :...

Roll Number :...

Class :...


PREFACE

In the past fifteen years the interactive computer graphics and CAD/CAM

technology have been impacting the drafting, design, and manufacturing tools

significantly. The purpose of this course is to present CAD/CAM principles and tools in

generic and basic terms. These principles are supplemented with engineering and design

applications as well as problems. The course is also concerned with developing basic

abilities to utilize the existing CAD/CAM systems (in our case CREO PARAMETRIC 1.0

V5) in engineering practice. In engineering practice, CAD/CAM has been utilized in

different ways by different people.

Some of the applications of this technology are:

Production of drawings and design documents

Visualization tool for generating shaded images and animated displays

Engineering analysis of the geometric models (finite element analysis, kinematic

analysis, etc.)

Process planning and generation of NC part programmes.

SAFETY IN THE COMPUTER LAB

Always Remember: Safety First!

These guidelines are important. It is possible to do serious damage in the Computer Lab- both to yourself and to some expensive equipment. Please, follow

these guidelines!


Protecting Yourself

In the Computer Lab

Please, no running.

Periodically glance away from the screen. Staring into a computer monitor too

long will strain your eyes.

Let an instructor know if the colour scheme, font size, or other settings of your

computer are causing strain on your eyes. There are many built-in ways to adjust

these settings for comfort.

Avoid long sessions of typing as they may cause repetitive stress injuries to your

hands.

Maintain good posture to ease your back.

Keep the noise level to a minimum.

Be aware of the fire exits and the location of this rooms fire extinguishers.

When working inside of a computer case

Dont attempt to touch any live wires. The high voltage in this country can kill!

Dont open the computers power supply or monitor. There is nothing inside either

that can be repaired except by a professional, but there are many things that can

injure you.

Watch out for sharp metal edges!

Finally

Dont sit in front of the computer all day. It is not your friend, its just a tool! Get

out and exercise, chat with your mates, and have a life!


Protecting the Equipment

In the Computer Lab

Please, no food or drink near the computers!

Always shut down the computer via Windows Start button

Use a surge protector to keep excess electric power from damaging your computer

Unplug the computer or turn off the wall socket when the machine is not in use.

Excessive heat can damage the computers. Please ensure that the room temperature

stays cool.

Motion can damage some computer components. Try to move laptop computers as

little as possible, especially when the hard drive or the floppy drive is whirring.

Note all serial numbers, in case of theft.

Always have at least two copies of all your important files, in case the worse

happens! Especially in busy offices, the data on your computer is soon more

valuable than the hardware itself.

Turn off the computer when not in use. Like a car engine, parts wear out after a

certain mileage!

When working inside of a computer case

Beware of static electricity! The mild shock that would startle you can destroy the

sensitive electronics inside of a computer. Wear an anti-static strap to ensure that

you are grounded to the PC.

Do not touch any of the circuit boards directly! If you must add or remove them,

please handle them by their edges. They can be damaged, and the fingerprints that

you leave behind can cause short circuits

Especially, do not touch the gold or silver contacts where the component connects to

the motherboard!

Keep dust away from the computers. This can cause short circuits


INSTRUCTIONS TO STUDENTS

Students are required to remove their footwear outside the centre and keep it in the

box provided for the same.

Students should leave their belongings outside the lab except their observation note

book, the concerned books/manuals and calculators.

Students are requested not to place their legs on the wall or on the table.

Students should refrain from leaning on the table and sitting on it.

Before logging in to a particular terminal, if there is something wrong in the

terminal, the student should report the same immediately to the concerned staff.

Students should not use any disks brought from outside without prior permission

from the concerned staff.

Before leaving the Terminal, the students should logout properly and leave their

chairs in position.

Students are not allowed to take any manual outside the center.

Edibles are strictly prohibited in the center.

No internet browsing allowed during the lab hours.

IMPORTANT INSTRUCTIONS TO HANDLE CNC MACHINES

Get permission from the concerned staff before switch ON the CNC machines.

Ensure the proper power supply for the system and machine.

Handle the CNC machines very carefully.

If any problem occurs in the system or machine immediately inform to the concerned staff. Dont try to rectify the problem by yourself.

Your batch is responsible for the CNC machine and its system while doing the lab

Exercise assigned to your batch.


SYLLABUS

A.Computer Aided Design (CAD)

3D Part modeling protrusion, cut, sweep, draft, loft, blend, rib

Editing Move, Pattern, Mirror, Round, Chamfer

Assembly creating assembly from parts assembly constraints

Conversion of 3D solid model to 2D drawing - different views, sections, isometric view and dimensioning

Introduction to Surface Modeling

3D modeling of machine elements like flanged coupling, screw jack etc.

B. Computer Aided Manufacturing (CAM)

1. Manual Part Programming (Using G and M Codes) In CNC lathe

1.1 Part programming for Linear and Circular interpolation, Chamfering and Grooving

1.2 Part programming using standard canned cycles for Turning, Facing, Taper turning and Thread cutting

2. Manual Part Programming (Using G and M Codes) In CNC Milling

2.1 Part programming for Linear and Circular interpolation and Contour motions.

2.2 Part programming involving canned cycles for Drilling, Peck drilling, and Boring.

C. Simulation and NC Code Generation

NC code generation using CAD / CAM softwares - Post processing for standard CNC Controls like FANUC, Hiedenhain etc.

Course code and Name 08AA705 CAD /CAM LABORATORY

Semester 7 Credits 3


LIST OF EXERCISES

Sl. No. DESCRIPTION

Page No.

A) COMPUTER AIDED DESIGN (CAD)

1 Design process and Role of CAD. 10

2 Solid modeling. 11

3 Requirements for Modeling Assembly. 12

4 CAD/CAE/CAM Data Exchange. 12

5 Creo Parametric 1.0 software overview. 13

6 Exercises in 3D Part Modeling. 28

7 Exercises in Part Assembly. 38

8 Additional Exercises in Part Modeling and Assembly. 46

B) COMPUTER AIDED MANUFACTURING (CAM)

MANUAL PART PROGRAMMING IN CNC LATHE

9 Programming in CNC Lathe. 49

10 Exercise in Production Lathe using Single Tool. 54

11 Exercise in Production Lathe using Multi Tool. 70

MANUAL PART PROGRAMMING IN CNC MILLING

12 Linear, Circular Interpolation and Pocketing. 76

13 Exercises in Linear, Circular Interpolation and Pocketing. 76

C) SIMULATION AND NC CODE GENERATION

14 LATHE SIMULATION- CL and NC Code generation using CAPSTURN software. 65

15 MILLING SIMULATION- CL and NC Code generation using CAPSMILL software. 81


INDEX

EX. NO

DATE NAME OF THE EXPERIMENT MARKS PAGE

NUMBER SIGNATURE

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.


Staff In charge

K.L.Senthil Kumar,

Assistant Professor/Mechanical

EX. NO

DATE NAME OF THE EXPERIMENT MARKS PAGE

NUMBER SIGNATURE

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.


A.COMPUTER AIDED DESIGN (CAD)

1. DESIGN PROCESS AND ROLE OF CAD

According to Shingly, the design process is an iterative procedure involving the following six phases:

a). Recognition of need b). Definition of problem c). Synthesis d). Analysis and optimization e). Evaluation f). Presentation

Phase 3 (synthesis) includes defining the design problem, design conceptualization, searching for design information, modeling and simulation. Phase 4 (analysis and optimization) may includes parameter study, finite element analysis, etc. Although computers are being utilized more and more in the design process, their use is still limited to the last four steps in the design and they are mainly used as a tool that helps the designer, rather than as a replacement for the designer. BENEFITS OF USING CAD:

(1) Increasing productivity (2) Improving quality of design (3) Improving communications (4) Creating data-base for manufacturing

GEOMETRIC MODELING

The term geometric modeling (or representation) means a method of describing commonly used curves and surfaces in terms of values of a few parameters. THREE TYPES OF GEOMETRIC MODELS Wireframe Model : connect 3D vertex points, sometimes ambiguous. Surface Model : define surface to form an object. Solid Model : various representation schemes are used to describe a solid object


THE DESIGN PROCESS AND COMPUTER-AIDED DESIGN Design process

Fig-1.1 Role of computers in design process 2. SOLID MODELING

A solid modeling system is usually an interactive computer graphics system that is intended to create true three-dimensional components and assemblies. Recent advances in CAD software, computers, and graphical displays have made it possible to use solid representations of components being considered in the design process. These solid models can be employed innumerous ways.

ADVANTAGES OF SOLID MODELING

A realistic visual display: By producing a shaded visible surface image of the solid, solid modeling allows a designer to see exactly what has been created. Easy to deal with


different views: Once a part has been created, we have the ability to rotate, shade, section, or produce almost any view required by a designer.

Single associated model database: The solid modeler provides the only database suitable for all CAD operations. Almost all information needed for part generation is contained in the solid model. The algorithm should be able to ensure that it represents physically possible shape that is complete and unambiguous Applications. e.g., automatic generation of a mesh for a finite element analysis.

3. REQUIREMENTS FOR MODELING ASSEMBLING

a). PART MODELING AND ANALYSIS:

The part analysis includes the material type, mass and inertial properties, functional properties of the faces, etc.

b). HIERARCHICAL RELATIONSHIPS:

An assemble tree and assemble sequence must be given.

c). MATING CONDITIONS: There are two methods for specifying mating conditions: Specify the location and

orientation of each part in the assembly, together with the representation of the part itself, by providing a 4 x 4 homogeneous transformation matrix. (i.e., transformation from MCS to WCS)Specify the spatial relationships between its individual parts as mating conditions. For example, a mating condition can consist of planar faces butting up against one another or requiring centerlines of individual parts to be collinear.

4. CADCAE/CAM DATA EXCHANGE

Computer databases are now replacing paper blueprints in defining product geometry

and non-geometry for all phases of product design, analysis, and manufacturing. It becomes increasingly important to find effective procedures for transferring data among CAD/CAE/CAM systems.

The need to exchange modeling data is directly motivated by the need to integrate and automate the design and manufacturing process to obtain the maximum benefits from CAD/CAE/CAM systems.

FOUR TYPES OF MODELING DATA TO BE TRANSFERRED:

(1) Shape (2) Non shape (3) Design (4) Manufacturing


(1) Shape data consists of both geometrical and topological information as well as part features. Entity attributes such as font, color, and layer as well as annotation is considered part of the entity geometrical information. Topological information applies only to products described via solid modeling. Features allow high-level concept communication about parts. Examples are hole, flange, web, pocket, chamfer, etc.

(2) Non shape data includes graphics data such as shaded images, and model global data as measuring units of the database and the resolution of storing the database numerical values.

(3) Design data has to do with the information that designers generate from geometric models for analysis purposes. e.g., mass property and finite element mesh data.

(4) Manufacturing data consists of information such as tooling, NC tool paths, tolerance, process planning, tool design, and bill of materials.

Commonly Used CAD Data Exchange Format IGES (Initial Graphics Exchange

Specification) PDES (Product Data Exchange Using STEP) IGES is focused on CAD-to-CAD exchange where primarily shape and non-shape data were to be transferred from one system to another. PDES is previous called Product Data Exchange Standard. It is for the exchange of complete product descriptions which covers the four types of modeling data (i.e., shape, non-shape, design and manufacturing).Other data exchange interfaces include: STL, Neutral, SET, ECAD, VDA, STEP, PDGS, Creo Parametric 1.0, Render, CGM, VRML, PATRAN, TIFF, etc.

5. CREO PARAMETRIC 1.0 SOFTWARE OVERVIEW

Creo Parametric 1.0 is a computer-aided design (CAD) system for mechanical assembly, part modeling, and drawing production. Developed with STREAM technology, Creo Parametric 1.0 is designed to increase software performance with an interface that ensures maximized user productivity and return on investment. Creo Parametric 1.0 STREAM technology boosts essential CAD user productivity by capturing engineers' solid modeling design intentions through inference logic and decision-management concepts. STREAM technology makes Creo Parametric 1.0 easy to learn, easy to use, and more productive than any other mid-range CAD system on the market. THE PART ENVIRONMENT:

The Creo Parametric 1.0 part modeling environment allows you to construct 3-D solid models with true features. The part modeling process starts with a base feature, such as a block or cylinder, which you build upon with part features to create a part model. Part features include protrusions and cutouts (extruded, revolved, swept, and lofted), holes, ribs, thin-walled solids, rounds, draft angles, and chamfers. You can also construct rectangular and circular feature patterns and mirror copies. When you design parts in Solid Works, all


geometry is created in the context of constructing features. The software keeps track of construction elements for you, making them available when you edit the feature but hiding them from view while you work on other parts of the design. You can also add your own construction geometry, such as extruded, lofted, and swept surfaces, intersection curves, projected curves, and intersection points.

THE ASSEMBLY ENVIRONMENT:

Creo Parametric 1.0 can manage large, complex assemblies containing many parts and sub-assemblies. The Assembly environment contains commands for fitting parts together with natural assembly techniques such as mate and aligns. Creo Parametric 1.0 accommodates the fact that most parts are designed in the context of an assembly. To support this workflow, Creo Parametric 1.0 provides tight integration with the part modeling environment, visualization tools, data management tools, and part-to-part relationship management tools. Creo Parametric 1.0 makes it easy to manage assembly data from the earliest phases of project planning, through revision cycles, manufacturing, project maintenance, and archival. THE DRAFT ENVIRONMENT:

Creo Parametric 1.0 provides a separate drafting environment for producing engineering drawings directly from 3-D part or assembly models. Creo Parametric 1.0 drawings are associated with the 3-D model, so that the drawing reflects changes in the model as the design progresses. These model-to-drawing links minimize drawing maintenance in response to engineering changes, so that you can easily keep drawings up-to-date with the part or assembly model. Hidden line representations are properties of the drawing view they do not affect your view of the solid model in the Part or Assembly environments. You can create drawings that display various views, sections, details, dimensions, notes, and annotations. You can also add feature control frames, datum frames, weld symbols, and surface texture symbols to your drawings. Ensuring that the dimensions and annotations on your drawings conform to your companys standards or international standards are easy as in Microsoft Office products, you can capture these settings in styles and templates.

6. PART MODELING AND ASSEMBLING

IMPORTANT STEPS a). Choose the best profile for sketching. b). Choose the proper sketch plane. c). Create a new part. d). Create a sketch. e). Extrude a sketch as a boss. f). Extrude a sketch as a cut.


g). Create Whole Wizard holes. h). Insert fillets on a solid. i). Make a basic drawing of a part. j). Make a change to a dimension. k). Demonstrate the associatively between the model and its drawings.

TERMINOLOGY: Moving to 3D requires some new terminology. The CREO PARAMETRIC 1.0

software employs many terms that you will become familiar with through using the product. Many are terms that you will recognize from design and manufacturing such as cuts and bosses. FEATURE:

All cuts, bosses, planes and sketches that you create are considered Features. Sketched features are those based on sketches (boss and cut), applied features are based on edges or faces (fillet).

GRAPHICS TOOLBAR:

Located at the top of the graphics area, the in Graphics toolbar contains commonly used tools and filters for the graphics area display. You can customize the tools and filters displayed in the In Graphics toolbar.

Fig-1.2 Graphics toolbar

QUICK ACCESS TOOLBAR:

The Quick Access toolbar is located at the top of the interface. It contains a commonly used set of commands that are independent of the tab currently displayed in the ribbon. These commands are available regardless of the specific mode or tab in which you are working. You can customize the Quick Access toolbar to add additional commands.

Fig-1.3 Quick Access toolbar

RIBBON: A context-sensitive menu across the top of the interface that contains the majority of

the commands you use in Creo Parametric 1.0 Parametric. The ribbon arranges commands into logical tasks through tabs and groups


Fig-1.4 Ribbon

PLANE:

Planes are flat and infinite. They are represented on the screen with visible edges. They are used as the primary sketch surface for creating boss and cut features.

Fig-1.5 Default Datums

PARALLEL PLANE:

Creates a reference plane parallel to a part face or reference plane at an offset value you define. You can define the offset value using the cursor or by typing a value in the Distance box on the ribbon bar.

SKETCH:

In the Creo Parametric 1.0 system, the name used to describe a 2D profile is sketch. Sketches are created on flat faces and planes within the model. They are generally used as the basis for bosses and cuts, although they can exist independently. EXTRUSION BOSS/ BASE:

Although there are many ways to create features and shape the solid, for this lesson, only extrusions will be discussed. An extrusion will extend a profile along a path normal to the profile plane for some distance. The movement along that path becomes the solid model.


Fig-1.6 Extrusion of solid from Base

EXTRUDED CUTOUT:

A Cut is used to remove material from the model. This is the opposite of the boss. Like the boss, cuts begin as 2D sketches and remove material by extrusion, revolution, or other methods.

Fig-1.7 Extrusion of solid from Base

REVOLVED BOSS/ BASE: Constructs a protrusion by revolving a profile

a) Create a sketch that contains one or more profiles and a centerline, line, or edge to use as the axis around which the feature revolves.

b) Click one of the following revolve tools: i). Revolved Boss/Base on the Features toolbar, or Insert, Boss/Base,

ii). Revolve Revolved Surface on the Surfaces toolbar, or Insert, Surface, Revolve


c) In the Property Manager, set the options. d) Click OK.

Fig-1.8 Revolved object

LOFTED BOSS/ BASE:

Constructs a protrusion by fitting through a series of cross sections. You can define the cross sections using profiles drawn within the command, sketches, or edges of existing features. The cross sections must be closed, planar elements

Fig-1.9 Extrusion of solid from Lofted Boss

VIEW OPTIONS:

Creo Parametric 1.0 gives you the option of representing your solid models in one of several different ways. Examples of each are shown in the illustration below


Fig-1.10 View Options CREATION OF BASIC SOLID FEATURES: Extrude: Extension in third axis of the profile

Fig-1.11 Extrude of Solid from the sketch

Revolve: Revolve the profile about axis of symmetry

Fig-1.12 Revolve the profile about axis symmetry


Sweep: Extrusion of a cross section along a path

Fig-1.13 Sweep extrusion of a cross section along a path

Blend / Loft : Blending of different cross sections along a path

Fig-1.14 Extrude of Solid using blend

EDITING & ENGINEERING FEATURES IN PART MODELING

a) Round : Modify the sharp edge to curved edge b) Chamfer : Modify the sharp edge to flat edge c) Shell: Removes a surface or surfaces from the solid then hollows out the inside of

the solid, leaving a shell of a specified wall thickness. d) Rib : Special type of protrusion to create a thin fin or web e) Cut : Remove the undesirable portion from the basic part f) Hole : Remove cylindrical portion from the basic part g) Pattern: Create instances of the selected feature by varying some specified

dimensions CHAMFER EDGE CHAMFER: Add or remove material by creating a beveled surface on an edge or between surfaces. CUT: Use an Extrude to remove material from the part. To meet our design requirements, the

depth of the extrude will use a different depth type on each side of the sketch plane.


Fig-1.15 Removal of undesirable portion from the basic part using CUT

HOLE:

Use the Hole tool to create a coaxial hole on the axis of the axle hub. The hole will be diameter and have a blind depth. The car axel will be inserted into the hole when assembled.

Fig-1.16 Removal of cylindrical portion from the basic part using HOLE

PATTERN:

The Pattern tool enables you to quickly duplicate a feature within your model. In this exercise, you will learn to pattern about an axis using the Axis type pattern. You will also use the Reference pattern to create patterns where a feature follows the pattern of a feature it references.

Fig-1.17 Creation of instances of the selected feature using PATTERN


SETTING YOUR WORKING DIRECTORY: Creo Parametric 1.0 Parametric starts in a start-in folder on your computer, by

default; this is your working directory. A working directory is the folder you open files from and save files to. The working directory is selected before every session. When you exit Creo Parametric 1.0 Parametric, it does not remember the working directory for the next session. Open Files - The File Open dialog box looks to the working directory. Save Files - Files are saved to the folder they were opened from, this is not always the working directory.

Fig-1.18 Setting of working directory

SETTING DATUM TAG DISPLAY: The display of each datum tag type can be controlled independently using icons from the Show group of the View tab.

Fig-1.19 Setting Datum Tag Display PROCEDURE - BASIC PART MODELING: a) Set your working directory and create a new part name b) From the Home tab, Data group, click Select Working Directory c) In the Select Working Directory dialog box

Navigate to the folder Creo Parametric 1.0


Double-click the folder Module Double-click the folder Part. Click OK to set the folder as your working directory

d) Create the new part model.

Fig-1.20 Create the new part model

e) Start the Extrude tool and sketch a curve to define the shape of the part.

Fig-1.21 Selection of the datum plane

f) From the In Graphics toolbar, click Sketch View to re orient the model to the 2-D sketch

view.


Fig-1.22 Sketch view for 2D sketch

g) Light blue weak dimensions are automatically created when you sketch a shape. If you

edited the dimension values, they will convert to dark blue strong dimension. Weak dimensions are Creo Parametric 1.0s guess as to how the sketch should be dimensioned.

Fig-1.23 Sketch Dimensioning

h) Use the Extrude tool to create a solid cylinder that is extruded a depth, symmetrically about the sketch plane FRONT.

Fig-1.24 Extrude options


i) Define additional options to complete the extruded cylinder.

Fig-1.25 Extruded solid

ASSEMBLY OPERATIONASSEMBLY CONSTRAINTS: a). Create an assembly containing component1.PRT and component2.PRT

From the Quick Access toolbar click New. Select Assembly as the Type. Type component in the Name field and click OK.

Fig-1.26 New assembly part open

b). If necessary, from the In Graphics toolbar, click Datum Display Filters and disable the

display of all datum features. c). From the Model tab, Component group, click Assemble. d). In the Open dialog box, select component2.PRT and click Open

Click in the graphics area to position the part. In the graphics area, right-click and select Default Constraint from the pop-up

menu. Click Complete Component


Fig-1.27 Setting of default constraint

e). Click Assemble from the Component group. f). In the Open dialog box, select Component1.PRT and click Open

Click in the graphics area to position the component-1 near the component-2 g). Select the first set of constraint references:

Select the inner cylindrical surface of Component1.PRT Select the outer cylindrical surface of Component2.PRT

Fig-1.28 Assembling of mating surfaces

h). Select the second set of constraint references:

Move your cursor over datum plane FRONT in Component1.PRT and when it highlights, select it.

Move your cursor over datum plane FRONT in Component2.PRT and when it highlights, select it.


Fig-1.28 Assembling of surfaces by coincident

i). Ensure that the Constraint type shown in the dashboard is Coincident and not Distance j). On the left side of the dashboard, select the Placement tab notice that a constraint set

containing two Coincident type constraints was created based on the references you selected.

k). Click Complete Component. l). Press CTRL + D to reorient the model.

m). From the Quick Access toolbar, click Save and Click OK to verify that the model will be

saved in your working directory.


EXERCISE FOR PART MODELING

&

ASSEMBLY


All dimensions are in mm

Ex.No:

PART MODELING -WALL BRACKET: 01 Date:


AIM

It is aimed to understand the commands used for geometric modeling in Creo

Parametric 1.0 modeling and thereafter create a 3D module of the wall bracket.

SOFTWARE USED

Creo Parametric 1.0

PROCEDURE

The modeling process is initiated by prompting the modeling window of the

Creo Parametric 1.0 software.

The features of the part to be modeled are studied for planning the modeling.

Part Design is selected to model a given component.

Select a plane (XY or YZ or ZX) and enter into the sketch mode of

Mechanical Part Design.

The 2-Dimensional diagram is sketched in sketch mode using profile,

constraint, and operation tool bar using sketch tools.

The 3-Dimensional diagram is obtained by performing various operations

using sketch based, dress up, transformation and constraint features tool bars.

Check the part modeling diagram using the given Component and then

verified.

RESULT

Thus three dimensional models was created for the given part and verified for

dimensional consistency using Creo Parametric 1.0 software.

Ex.No:




Ex.No:



AIM



SOFTWAREUSED

Creo Parametric 1.0

PROCEDURE












verified.

RESULT



Ex.No:




Ex.No:



AIM



SOFTWAREUSED

Creo Parametric 1.0

PROCEDURE












verified.

RESULT



Ex.No:




Ex.No:



AIM



SOFTWAREUSED

Creo Parametric 1.0 PROCEDURE












verified.

RESULT



Ex. No:




Ex.No:



AIM

It is aimed to understand the commands used for geometric modeling in

modeling and thereafter create a 3D module of the wall bracket.

SOFTWAREUSED

Creo Parametric 1.0

PROCEDURE












verified.

RESULT



Ex.No:

PART MODELING -WALL BRACKET: 05

Date:



Ex.No:

PART ASSEMBLY-SCREW JACK

Date:


AIM

It is aimed to understand the commands used for geometric assembling in

Creo Parametric 1.0 assembly and thereafter create a 3D module of the given

component.

SOFTWARE USED

Creo Parametric 1.0

PROCEDURE

The modeling process is initiated by prompting the modeling window of the Creo Parametric 1.0 software.

The features of the part to be modeled are studied for planning the modeling. Part design is selected to model a given component. Select a plane (XY or YZ or ZX) and enter into the sketch mode of

Mechanical Part Design. The 2-Dimensional diagram is sketched in sketch mode using profile,

constraint, and operation tool bar using sketch tools. The 3-Dimensional diagram is obtained by performing various operations

using sketch based, dress up, transformation and constraint features tool bars. All components are drawn similarly and saved. Assembly design is selected to assemble the various parts of the given

component. Various parts are imported using product structure tool bar. The assembly diagram is obtained by performing various operations using

assembly, move, constraint tool bars. Check the assembly drawings using the given detailed drawings and then

verified.

RESULT

Thus assembled model was created and verified for dimensional consistency using


Ex. No:

PART ASSEMBLY-SCREW JACK Date:



Ex. No:

PART ASSEMBLY-KNUCKLE JOINT Date:


AIM



component.

SOFTWAREUSED

Creo Parametric 1.0

PROCEDURE








verified.

RESULT

Thus assembled model was created and verified for dimensional consistency

using Creo Parametric 1.0 software.

Ex.No:

PART ASSEMBLY-KNUCKLE JOINT Date:



Ex.No:

PART ASSEMBLY-PLUMBER BLOCK Date:


AIM

It is aimed to understand the commands used for geometric assembling in Creo

Parametric 1.0 assembly and thereafter create a 3D module of the given component.

SOFTWAREUSED









verified.

RESULT



Ex.No:

PART ASSEMBLY-PLUMBER BLOCK Date:



Ex.No: PART ASSEMBLY-PROTECTED FLANGE COUPLING

Date:


AIM



component.

SOFTWAREUSED





Part design is selected to model a given component.







All components are drawn similarly and saved.

Assembly design is selected to assemble the various parts of the given

component.

Various parts are imported using product structure tool bar.

The assembly diagram is obtained by performing various operations using

assembly, move, constraint tool bars.

Check the assembly drawings using the given detailed drawings and then

verified. RESULT



Ex.No:

PART ASSEMBLY-PROTECTED FLANGE COUPLING Date:


CONTENT BEYOND THE SYLLABUS

EXERCISES DIAGRAMS FOR

PART MODELING &

ASSEMBLY


ADDITIONAL EXERCISES IN PART MODELING


ADDITIONAL EXERCISE IN ASSEMBLY MODELING


COMPUTER AIDED MANUFACTURING (CAM)

MANUAL PART PROGRAMMING & SIMULATION

CNC-TURNING MACHINE &

CNC-MILLING MACHINE


INTRODUCTION TO CAM

The CAM process is a subset of the manufacturing process. Computer-aided

manufacturing (CAM) is defined as the effective use computer technology in

manufacturing planning and control. CAM is most closely associated with functions

in manufacturing engineering, such as process and production planning, machining,

scheduling and numeric control part programming. The implementation of CAM

process is shown in figure.

Fig-2.1 Implementation of CAM Process

The geometric model developed during the CAD process forms the basis of

the CAM activities. Various CAM activities may require various CAD information.

Interface algorithms are usually utilized to extract such information from CAD

Geometric model

Interface Algorithm

Process planning

Assembly

NC programming

Inspection

Packing


databases. In case of process planning, features that are utilized in manufacturing

(e.g., holes, slots, etc.) must be recognized to enable efficient planning of

manufacturing. NC programme, along with ordering tools and fixtures, result from

process planning. Once parts are produced, CAD software can be used to inspect

them. This is achieved by superposing an image of the real part with a master image

stored in its model database. After passing inspection, CAM software can be utilized

to instruct robot systems to assemble the parts to produce the final product.

PREPARATORY FUNCTIONS:

G00 Rapid Traverse

G01 Linear Interpolation (Cutting feed)

G02 Circular Interpolation (Clockwise)

G03 Circular Interpolation (Counter Clockwise)

G04 Dwell

G28 Return to Machine reference position

G40 Tool nose radius compensation cancel

G41 Tool nose radius compensation left

G42 Tool nose radius compensation right

G50 Maximum spindle speed setting / Coordinate system setting

G70 Finishing cycle

G71 Turning cycle (Rough)

G72 Facing cycle

G73 Pattern repeating cycle

G74 End face peck drilling

G75 Outer diameter / internal diameter drilling

G76 Multiple thread cutting

G96 Constant surface speed

G97 Constant surface speed cancel (constant rpm)

G98 Feed per minute

G99 Feed per revolution


MISCELLANEOUS FUNCTIONS:

M00 Program stop

M01 Optional stop

M03 Spindle clockwise

M04 Spindle counter clockwise

M05 Spindle halt

M08 Coolant on

M09 Coolant off

M10 Chuck or collet close

M11 Chuck or collet open

M30 Program End

M40 Chuck outer clamping

M41 Chuck inner clamping

GENERAL NOTATIONS: X X coordinate value Y Y coordinates value Z Z coordinates value D Diameter of tool T Tool Number F Feed rate S Spindle speed R Radius of arc SYNTAX:

G00 X Z;

G01 X Z F ;

G02 X Z R F ;

G03 X Z R F ;

G04 X ;

G28 U W ;

G70 P Q F;


P Start sequence Q End sequence F Feed

G71 U R;

G71 P Q u w F;

U Depth of cut R Relief in X direction P Start sequence Q End sequence u Stock amount for finish X axis w Stock amount for finish Z axis F Feed

G74 R;

G74 Z Q F;

G75 R;

G75 X Z P Q F;

G76 P Q R;

G76 X Z q p F;

P Number of idle passes Q First pass depth of cut R Relief X Thread minor diameter Z Thread Length q Second pass depth of cut p Thread height F Pitch


EXERCISE

FOR

CAM PROGRAMMING


All Dimensions are in mm

PROGRAM:

O0001

G21 G40 G98

G28 U0 W0

M06 T0101

M03 S1500

G00 X23 Z2

G90 X23 Z-10 F30

X22

X21

X20

X19

X18

X17

X16

X15

X14

X13

X12

G00 X23 Z-10

G90 X23 Z-20 F30

X22

X21

X20

X19

X18

X17

X16

G00 X23 Z-20

G90 X23 Z-30 F30

X22

X21

X20

G00 X23 Z-30

G90 X23 Z-70 F30

X22

G28 U0 W0

M05

M30

Ex. No: MANUAL PROGRAMMING LATHE

(STEP TURNING) Date:


AIM

It is aimed to write a manual program for performing plain turning

operation in cylindrical shaft using CNC trainer lathe.

EQUIPMENTS AND TOOLS

CNC lathe.

Work piece blank (23 X 70 mm).

Carbide tipped turning tool.

Vernier caliper (0 150 mm).

PROCEDURE

The program is written using G00, G01 and G90 Codes through iterative edit box of the CNC software.

Appropriate machining parameters such as spindle speed and feed are included in the programme using the syntax Sxxxx in rpm and Fxx in mm/min.

Simulation is performed for verification and errors are removed if any. Work piece is fitted in the chuck of the CNC Trainer lathe. Initially, the slides are moved to home position for making the tool offset. Necessary carbide tipped turning tool is mounted in the required tool

pocket in the turret. Tool offsets are found in X axis and Z-axis sequentially, by moving the

slides in such a way that it just touches the work piece. Then, tool offsets are programmed in the machine for the movement of the

tool with respect to the work piece datum. The CNC program is executed for machining the work piece. The dimensions are verified using Vernier Caliper.

RESULT

Thus the CNC program is written and the given work piece is machined to

the required size.





PROGRAM

O0002 R = (Maximum dia minimum dia) / 2

G21 G40 G98

G28 U0 W0

M06 T0101

M03 S1500

G00 X20 Z2

G90 X20 Z-15 F30 R-0.5

R-1.0

R-1.5

R-2.0

R-2.5

G28 U0 W0

M05

M30


(TAPER TURNING) Date:


AIM

It is aimed to write a manual program for performing taper turning



CNC lathe.

Work piece blank ( 20 X 70 mm).


Vernier caliper ( 0 150 mm).

PROCEDURE

The program is written using G00, G01 and G90 Codes through iterative edit box of the CNC software.


Required radius for the taper turning operation is calculated by (max.dia min.dia)/2.





RESULT


the required size.





PROGRAM:

O0003

G21 G40 G98

G28 U0 W0

M06 T0606

M03 S600

G00 X18 Z2

G76 P 06 1560 Q50 R0.1

G76 X16.744 Z-14 P613 Q300 F1

G28 U0 W0

M05

M30


(THREADING) Date:

M18 X 1

25

14


AIM

It is aimed to write a manual program for performing threading operation

in cylindrical shaft using CNC trainer lathe.


CNC lathe.




PROCEDURE

The program is written using G00, G01, G76 and G90 Codes through iterative edit box of the CNC software.






RESULT


the required size.


(THREADING) Date:



PROGRAM:

O0004

G21 G40 G98

G28 U0 W0

M06 T0101

M03 S1200

G00 X20 Z2

G74 R0.5

G74 X0 Z-5 Q5000 F30

G28 U0 W0

M06 T0202

M03 S1200

G00 X0 Z2

G74 R0.5

G74 X0 Z-22 Q5000 F30

G28 U0 W0

M06 T0303

M03 S1200


(DRILLING AND BORING) Date:


G00 X0 Z2

G74 R0.5

G74 X0 Z-22 Q5000 F30

G28 U0 W0

M06 T0404

M03 S1200

G00 X12 Z2

G90 X12.5 Z-15 F30

X13

X13.5

X14

X14.5

X15

X15.5

X16

X16.5 Z-7

X17

X17.5

X18

X18.5

X19

X20

X20.5

X21

X21.5

X22

G28 U0 W0

M05

M30


AIM

It is aimed to write a manual program for performing drilling and boring



CNC lathe.




PROCEDURE

The program is written using G00, G01, G74 and G90 Codes through iterative edit box of the CNC software.






RESULT


the required size.





PROGRAM:

O0005

G21 G98

G28 U0 W0

M06 T0202

M03 S1500

G00 X25 Z2

G71 U0.5 R1

G71 P1 Q6 U0.1 W0.1 F60

N1 G01 X16

G01 Z0

G01 X18 Z-2

G01 X18 Z-18

G03 X22 Z-22 R4

G01 X22 Z-30

N6 G01 X25 Z-36

G70 P1 Q6 S1500 F30

G28 U0 W0

M03 S600

M06 T0404

G00 X26 Z-16

G75 R1

G75 X15 Z-18 P50 Q1000 F30

G28 U0 W0

M06 T0606

M03 S600

G76 P 06 1560 Q50 R0.1

G76 X16.744 Z-14 P613 Q300 F1

G28 U0 W0

M05

M30


(STEP TURNING, GROOVING AND THREADING) Date:


AIM

It is aimed to write a manual program for performing step turning,

grooving and threading operation in cylindrical shaft using CNC trainer lathe.


CNC lathe.




PROCEDURE

The program is written using G00, G71, G70, G75, G76 and G90 Codes through iterative edit box of the CNC software.






RESULT


the required size.





Ex. No: COMPUTER ASSISTED PART PROGRAMMING LATHE



AIM

It is aimed to create a graphic model of the given part drawing and to

generate its computer numerical program using CADEM software.

EQUIPMENTS REQUIRED:

Computer with peripherals.

Laser printer.

PROCEDURE

Geometric model of the part to be machined is created using the graphic

command in the CADEM software. Model is created to the finished size

and profiles.

Stock size is defined using its diameter and length. A tool turret position is

selected as rear turret and tool facing downward is selected.

Initially facing operation is performed. Right hand facing tool is selected

and machining parameters such as depth of cut and spindle speed required

is maintained for facing operation.

Similarly right-hand turning tool is selected for turning operation. Depth

of cut, feed, spindle speed, coolant requirement is fixed for turning

operation.

Operations are verified by simulating them in the respective order as

created and the program is obtained for machining required profile.

RESULT

Thus the computer assisted program is obtained for machining the given

work piece.




AIM





Laser printer.

PROCEDURE



and profiles.



Right hand turning tool is selected and machining parameters such as

depth of cut and spindle speed required is maintained for the operation.



RESULT


work piece.






(THREADING) Date:


AIM





Laser printer.

PROCEDURE



and profiles.



Right-hand threading tool is selected for threading operation. Depth of cut,

feed, spindle speed, coolant requirement is fixed for the operation.



RESULT


work piece.


(THREADING) Date:


AIM





Laser printer.

PROCEDURE



and profiles.



Required drill tool is selected and machining parameters such as depth of

cut and spindle speed required is maintained for the operation.

Similarly, internal bore tool is selected for boring operation. Depth of cut,

feed, spindle speed, coolant requirement is fixed for the operation.



RESULT


work piece.




AIM





Laser printer.

PROCEDURE Geometric model of the part to be machined is created using the graphic


and profiles.



Initially step turning operation is performed. Turning tool is selected and

machining parameters such as depth of cut and spindle speed required is

maintained for the operation.

Grooving tool is selected for the next operation. Depth of cut, feed,

spindle speed, coolant requirement is fixed for the operation.

Similarly, right handed threading tool is selected for threading operation.

Depth of cut, feed, spindle speed, coolant requirement is fixed for the

operation.



RESULT


work piece.





Program:

O0001

G21 G28 Z0

G28 X0 Y0

M06 T01

M03 S1200

G90 G00 X20 Y10 Z5

G01 Z0 F40

M98 P005 5555

G00 G28 X0 Y0 Z0

M05

M30

O5555

G91 G01 Z-1 F40

G90 G01 X70 Y10

G03 X80 Y20 R10

G01 X80 Y70

G02 X70 Y80 R10

G01 X20 Y80

G03 X10 Y70 R10

G01 X10 Y20

G02 X20 Y10 R10

G01 X20 Y10 Z7

M99

Ex. No: MANUAL PROGRAMMING MILLING

(PROFILE MILLING) Date:


AIM

It is aimed to write a CNC program for profile milling operation and to

machine it with a CNC milling machine.

EQUIPMENTS/TOOLS REQUIRED

CNC milling machine.

Work piece blank.

End milling cutter.

PROCEDURE

The program is written using milling Codes through iterative edit box of

the CNC software.

Simulation is performed and verified for the given profile.

An end mill cutter is mounted in the collet chuck and kept in the

respective pocket of ATC.

All the slides are moved to the home position.

In the job mode, the slides are again moved to work piece reference.

After reaching the work reference, tool reference and tool offset is set for

the selected tool.

The program is executed for machining the profile.

RESULT

Thus the CNC program is written for the given profile and machining is

done using CNC milling machine.


(PROFILE MILLING) Date:



PROGRAM:

O0002

G21 G94

G91 G28 X0 Y0 Z0

M06 T0101

M03 S1500

G90 G00 X0 Y0 Z5

M98 P001 1111

M70

M98 P001 1111

M80

M71

M98 P001 1111

M81

M70

M71

M98 P001 1111

M80

M81

G21 G28 X0 Y0 Z5

M05

M30

O1111

G90 X10 Y10 Z5 F40

G01 Z-1 F40

G01 X35 Y10

G01 X10 Y35

G01 X10 Y10

G00 Z5

G00 X0 Y0 Z0

M99


(MIRRORING) Date:

AIM

It is aimed to write a CNC program for mirroring operation and to

machine it with a CNC milling machine.



Work piece blank.

End milling cutter.

PROCEDURE


the CNC software.







the selected tool.


RESULT



Ex.No: MANUAL PROGRAMMING MILLING

(MIRRORING) Date:



PROGRAM:

O0003

G21 G28 Z0

G28 X0 Y0

M06 T01

M03 S1200

G90 G00 X0 Y0 Z5

G73 G98 X20 Y20 Z-5 Q1 R2 K1 F15

X70 Y20

X45 Y45

G91 G28

M05

M30


(DRILLING) Date:


AIM

It is aimed to write a CNC program for drilling operation and to machine

it with a CNC milling machine.



Work piece blank.

End milling cutter.

PROCEDURE


the CNC software.







the selected tool.


RESULT




(DRILLING) Date:



Ex.No: COMPUTER ASISTED PART PROGRAMMING MILLING

(PROFILE MILLING) Date


AIM



EQUIPMENTS REQUIRED


Laser printer.

PROCEDURE Geometric model of the part is to be machined is created using the graphic

commands in CADEM software. Model is created to the finished size and

profiles.

Blank size is defined using its length, breadth and thickness.

Tool turret position is selected as rear turret and tool facing downward is

selected.

Profile milling is performed by selecting an end milling tool and depth of

cut, feed, spindle speed, coolant requirement are fixed for operation.

Operations are verified by simulating them in order as created and the

program is obtained for machining the profile.

RESULT


profile.


(PROFILE MILLING) Date




(MIRRORING) Date


AIM



EQUIPMENTS REQUIRED


Laser printer.

PROCEDURE

Geometric model of the part is to be machined is created using the graphic

commands in master CAM software. Model is created to the finished size

and profiles.



selected.

Mirroring is performed by selecting an end milling tool and depth of cut,

feed, spindle speed, coolant requirement are fixed for operation.



RESULT


profile.


(MIRRORING) Date




(DRILLING) Date


AIM



EQUIPMENTS REQUIRED


Laser printer.

PROCEDURE

Geometric model of the part is to be machined is created using the graphic

commands in master CAM software. Model is created to the finished size

and profiles.



selected.

Drilling is performed by selecting an appropriate tool and depth of cut,

feed, spindle speed, coolant requirement is fixed for operation.



RESULT


profile.


(DRILLING) Date




(POCKETING) Date


AIM



EQUIPMENTS REQUIRED

Computer with peripherals

Laser printer

PROCEDURE

Geometric model of the part is to be machined is created using the graphic commands in master CAM software. Model is created to the finished size and profiles.

Blank size is defined using its length, breadth and thickness. Tool turret position is selected as rear turret and tool facing downward is

selected. First circular pocketing is performed by selecting slot drilling tool and

depth of cut, feed, spindle speed, coolant requirement are fixed for operation.

Then the rectangular pocketing is done in the same way as that of circular pocketing with the same operating parameters.

The variety of profiles can be milled by giving the appropriate codes and syntax.

Operations are verified by simulating them in order as created and the program is obtained for machining the profile.

RESULT


profile.


(POCKETING) Date

Cad-cam Lab Manual (F)

Documents