S3 Mech CAD Lab Manual

DEPARTMENT OF MECHANICAL

ENGINEERING

LAB MANUAL

COMPUTER AIDED DRAFTING AND MODELING LAB

(S3 ME)

ST.THOMAS INSTITUTE FOR SCIENCE AND TECHNOLOGY (STIST) THIRUVANANTHAPURAM

08.308 Computer Aided Drafting and Modelling Lab

L-T-D: 0-0-2 Credits : 2

(i) Introduction to computer aided drafting and solid modeling: software and hardware.

(ii) Understand basic 2D geometric construction techniques.

a. Cartesian and polar coordinate systems: locating points, coordinate entry methods, units and limits.

b. Object generation: lines, arcs, polylines, and multilines; rectangles, circles, polygons, and ellipses.

c. Transformations: move, copy, rotate, scale, mirror, offset and array; trim, extend, fillet, chamfer

d. Layers: creation, naming, properties manager.

e. Blocks: create, edit, import and explode.

f. Text: creating and editing, formatting, text styles.

g. Dimensions: creating and editing, dimension styles.

(iii) Exercise on basic drafting principles to create technical drawings.

a. Create orthographic views of machine parts from pictorial views.

b. Create isometric views of machine parts from orthographic views

c. Create hatched sectional views of machine parts.

(iv) Understanding basic solid modeling techniques

a. Creation of solid primitives b. Boolean operations

c. Extrude, Revolve operations

d. 3D Views

(v) Exercise on basic modeling to create machine parts

Create solid models from pictorial views

University Examination:

Question paper may contain two parts. Part A shall contain 2D

drafting which carries 40% marks, Part B shall contain 3D drafting

which carries 40% marks and 20% marks is for viva voce conducted during

the exam.

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PART MODELING

Exercise No: 1

Exercise No: 3

Exercise No: 2

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Exercise No: 4

Exercise No: 5

Exercise No: 6

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Exercise No: 7

Exercise No: 8

Exercise No: 9

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Exercise No: 10

Exercise No: 11

Exercise No: 12

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Exercise No: 13

Exercise No: 14

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Exercise No: 15

Exercise No: 16

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Exercise No: 17

Exercise No: 18

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Exercise No: 19

Exercise No: 20

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STUDY ON SOLID EDGE

Introduction

Solid Edge is a 3D CAD parametric feature solid modeling software. It runs on

Microsoft Windows and provides solid modeling, assembly modelling and

drafting functionality for mechanical engineers, designers and drafters. Through

third party applications it has links to many other Product Lifecycle Management

(PLM) technologies.

History

Solid Edge V1 was first released in 1995. In October 1997 the Sheet Metal

environment was introduced with V3.5. UGS Corp switched from the ACIS

modeling kernel to Parasolid kernel in 1998 with V5. Solid Edge with

Synchronous Technology was launched in 2008. Solid Edge with Synchronous

Technology 2 was launched in 2009. Solid Edge ST3 was released on October 13,

2010, and ST4 followed in July 2012 with either modelling mode (Synchronous

or Ordered) being available from any part. The last version is Solid Edge ST5 with

ST6 due in 2013.

Modeling

Ordered

The ordered modeling process begins with a base feature controlled by a 2D

sketch, which is either a linear, revolved, lofted, or swept extrusion. Each

subsequent feature is built on the previous feature. When editing, the model is

"rolled back" to the point where the feature was created so that the user cannot

try to apply constraints to geometry that does not yet exist. The drawback is that

the user does not see how the edit will interact with the subsequent features.

This is typically called "history" or "regeneration based" modeling. In both

ordered and synchronous mode Solid Edge offers very powerful, easy yet stable

modeling in hybrid surface/solid mode, where "Rapid Blue" technology helps

the user to create complex shapes in an intuitive and easy way.

Direct

The Direct modeling features allows the user to change model

geometry/topology without being hindered by a native model's existing - or an

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13 CAD Lab Manual S3 Mechanical DEPT OF MECHANICAL - STIST

imported model's lack of - parametric and/or history data. This is particularly

useful for working with imported models or complex native models. Direct

modeling features are available in both Ordered and Synchronous mode. If used

in the Ordered mode, the direct modeling edits are appended to the history tree

at the point of current rollback just like any other ordered feature.

Synchronous

The software combines direct modeling with dimension driven design (features

and synchronously solving parametrics) under the name "Synchronous

Technology". Parametric relationships can be applied directly to the solid

features without having to depend on 2D sketch geometry, and common

parametric relationships are applied automatically.

Unlike other direct modeling systems, it is not driven by the typical history-based

modeling system, instead providing parametric dimension-driven modeling by

synchronizing geometry, parameters and rules using a decision-making engine,

allowing users to apply unpredicted changes. This object-driven editing model is

known as the Object Action Interface, which emphasizes a User Interface that

provides Direct Manipulation of objects (DMUI). ST2 added support for sheet

metal designing, and also recognizing bends, folds and other features of

imported sheet metal parts.

Assembly

An assembly is built from individual part documents connected by mating

constraints, as well as assembly features and directed parts like frames which

only exist in the Assembly context. Solid Edge supports large assemblies (over

100,000 parts).

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DIFFERENT VIEWS OF GIVEN SOLIDS

Exercise

No. 1

Exercise

No. 2

Exercise

No. 3

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Exercise

No. 4

Exercise

No. 5

Exercise

No. 6

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Exercise

No. 7

Exercise

No. 8

Exercise

No. 9

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Exercise

No. 10

Exercise

No. 11

Exercise

No. 12

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Exercise

No. 13

Exercise

No. 14

Exercise

No. 15

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Exercise

No. 16

Exercise

No. 17

Exercise

No. 18

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Exercise

No. 19

Exercise

No. 20

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Figure No: 1

Figure No: 2 Figure No: 3 Figure No: 4

Figure No: 5 Figure No: 6

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Exercise No. 1

Date:

3D MODELING OF A SOLID USING SOLID EDGE

Aim:

To model the given 3D part (figure 1) using Solid Edge ST5.

Commands and Tools used:

Extrude, Line, Rectangle, Circle, Arc, Trim, Smart Dimension, Zoom, Sketch

View.

Procedure:

1. Start Solid Edge ST5 software.

2. In the opening window, click ‘ISO Part’ for creating a new part file.

3. Save the file in .par format with a suitable file name. While the modeling

proceeds, save the work at regular intervals.

4. Start modeling by selecting the line command, choose an appropriate plane

for creating the 2D sketch and lock it (F3).

5. Select ‘Sketch View’ to orient the active view normal to the sketch plane.

6. Start drawing the 2D sketch given in figure 2, in the locked plane using

different sketch tools. The sketch shown in figure 2 can be drawn using Line

and Arc commands. Use Trim command if required.

7. Define the sketch using suitable dimensions. Use Smart Dimension tool.

8. After finishing the sketch shown in figure 2, extrude the sketched region to

required distance, 56.

9. For extruding the next section of the solid, open a new sketch by selecting the

suitable surface in the extruded model and lock the sketch plane. Click ‘Sketch

view’.

10. Draw the 2D sketch shown in figure 3 using Line command and dimension it

to define the sketch.

11. Extrude the sketched region to required distance, 100.

12. The procedure continues for extruding the next section of the given solid. Use

Circle command to draw the sketch shown in figure 4. Dimension it and locate

the circle with reference to the extruded model.

13. After defining the sketch, extrude it. The hole in this section is created by

drawing another circle (figure 5) on this extruded surface.

14. While extruding, select Remove material option to create a hole.

15. The last section of the solid, the rib, is drawn by creating a new reference plane

using the command ‘Coincide Plane’.

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25 CAD Lab Manual S3 Mechanical DEPT OF MECHANICAL - STIST

16. The new plane is created at the middle of the extruded cylinder (parallel to the

proposed rib). The sketch shown in figure 6 is drawn in this newly created

reference plane.

17. After defining the sketch, extrusion is done symmetrically about the plane, 9.

18. The final model should look like figure 1.

19. Select a standard view of the model using View Orientation tool and take a

screenshot.

20. Save the model and close the window.

Result:

The given 3D solid is modeled using Solid Edge.