lab manual te-i cad

7/29/2019 Lab Manual TE-I CAD

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Department of Mechanical Engineering

Shri. Balasaheb Mane Shikshan Prasarak Mandal, Ambap’s

ASHOKRAO MANE GROUP OF INSTITUTIONS

FACULTY OF ENGINEERING

Vathar Tarf Vadgaon, Dist. Kolhapur

DEPARTMENT OF MECHANICAL ENGINEERING

LABORATORY MANUAL

CAD

Class- T. E. Semester: V

Prepared By: Prof. V. D. Bodake Verified by: Prof. H. V. Shete

Subject Teacher HOD

LAB MANUAL: CAD 1




LABORATORY MANUAL

CAD

Class- T. E. Semester: V

LIST OF EXPERIMENTS

Prepared By: Prof. V. D. Bodake Verified by: Prof. H. V. Shete

Subject Teacher HOD

LAB MANUAL: CAD 2

Sr.

No Name of Experiment Page No.

1 Introduction to CAD/CAM 3

2 Introduction to CATIA 5

3 Introduction to sketcher tool 7

4 Sketch based feature tool 9

5 Transformation feature 11

6 Introduction to assembly design 12

7 Creation of drawing on sheet 14

8 Introduction to surfacing – I 16

9 Introduction to surfacing – II 18

10 Introduction to unigraphics 20




EXPERIMENT NO. 1

TITLE : Introduction CAD/ CAM

OBJECTIVE : To understand and handle design problems in a systematic manner.

Introduction:

1. CAD (Computer Aided Drafting)

CAD is defined as the use of computer system to assist in the creation, modification,

analysis or optimization of a design. The CAD hardware generally includes the computer

one or more graphically display terminals, keyboard and other equipments. The CAD

software consist of computer programs to implement computer graphics on the system

plus application programs to facilitate engineering function of the user. Examples include

stress, strain analysis etc thus CAD is subset process of design which is outcome of

modelling, geometric, computer graphics, design concept and analysis. The various

activities involved in the CAD are mass properties, Finite element method, dimensioning,

surface finish, assembly modelling, generation of shaded images, drafting and

documentation.

2. CAM (Computer Aided Manufacturing)

CAM refers to computer software used to develop computer software used to develop

computer numerical control (CNC) part programs for machining and other processing

applications. CAM is subset of manufacturing process which is integrated outcome of

CAD, CAE (Computer Aided Engineering), Automation and manufacturing Concept. The

various activities involved in CAM are computer aided process planning (CAPP),

Numerical Control (NC) programming, Co-ordinate measuring machine (CMM)

verifications, inspection material handling through Automated Guide Vehicle (AGV) and

Robots, Automated assembling Packing and Automated storage and retrieval system

(ASRS).

LAB MANUAL: CAD 3




3. Implementation of computer in Design.

4. Advantages of CAD/CAM system

1- Easier creation and correction of drawings

2- Better visualization of drawings.

3- Parametric Approach.

4- Automation of repeated task

5- Increased accuracy.

6- Bidirectional associativity.

7- Improved Filing system.

8- Multi-task application.

9- Design analysis.

5. Disadvantages of CAD/CAM system

1- Equipment is expensive.

2- Skilled person is required.

LAB MANUAL: CAD 4




EXPERIMENT No. 2

Title- Introduction to CATIA

Objective- To understand the basic of CATIA V5

1-Introduction

Catia V5 serves the basic the basic design tasks by providing different workbenches. A

workbench is defined as specified enviourrment consist of a set of tools which allow user

to perfect specific design tasks in a particular area. The workbenches in Catia V5 are part

design workbenches, Wireframe and surface design workbenches, Assembly design

workbench.

2-Feature Based Modelling

A feature is defined as the smallest building that can be modified individually. A model

creates in Catia V5 is a combination of a number of individual features and each feature is

relative to other directly or indirectly. These features understand their fit and functional

property and therefore can be modified any time during process if proper design intent is

mentioned while crating the model.

3-Specifiaction Tree

The specification tree keep the a track of all operation that are carried out on the part. The

specification tree appeared when you start a new file under the part design workbench.

4-Compass

The compass is used to manipulate the orientation of parts assemblies or sketches. You

can also orient the view of the parts assemblies.

5-Parametric Modelling

The parametric nature of a software package is defined as its ability to use the standard

properties in defining the shape size of geometry. The main function is to drive theselected geometry to a new size and shape without considering its original dimension.

You can change or modify the shape and size at any stage of the design process.

6-Bidirectional associativity

CATIA V5 has different workbenches such part design workbenches, assembly design

workbench and drawing workbench. The bidirectional assaociativity exist between all the

workbenches ensure that any modification made in the model in any one of the

workbenches of CATIA V5.

LAB MANUAL: CAD 5




7-Geometric constraints

These are logical operation performed o the sketch elements to define their size and

position with respect to other element. Geometric constraints are applied using two

method automatic constraint and manual constraint. While drawing sketch some

constraint are automatically applied and to it and to applied manually you need to invoke

the constraint defined in the dialog box tool and selected the appropriate check box.

Constraints in sketcher

1- Distance

2- Length

3- Angle

4- Radius/Diameter

5- Semi-major axis

6- Semi –minor axis

7- Symmetry

8- Fix

9- Mid point

10- Coincidence

11- Concentricity

12- Tangency

13- Parallelism

14- Perpendicular

15- Horizontal

LAB MANUAL: CAD 6




Experiment-3

Title- Introduction to sketcher tool

Objective- To study the geometry in 2-dimensional

1-The sketcher tool bar

The sketcher bar consists of the following tools

1- Grid

2- Snap to point

3- Element

4- Construction/ Standard element

5- Geometrical constraints

6- Dimensional constraints

2-Profile tool bar

The profile tool bar consists of following tool bar

1- Profile

2- Rectangle

a- Oriented rectangle

b- Parallelogram

c- Elongated hole

d- Cylindrical hole

e- Key hole profile

f- Hexagon

g- centered parallelogram

h- centered rectangle

3- Circle

a- Three point circle b- Circle using co-ordinates

c- Tri-tangent circle

c- Three point arc

d- Arc

4- Ellipse

5- Axis

6- Clicking points

LAB MANUAL: CAD 7




3-Operation tool bar

This tool bar consists of following tools

1- Corners

2- Champers

3- Trim

a- Quick trim

b- Break

4- Mirror

4-constraint tool bar

This tool bar consist of following tools

1- Constraint defined in dialogue box

2- Constraints

3- Fix together

4- Animated constraints

5- Edit multi constraints

5-View tool bar

This tool bar consist of following tools

1- Fit all in

2- Pan

3- Rotate

4- Zoom in

5- Zoom out

6- Normal view

7- Create multi view

8- Isometric view

LAB MANUAL: CAD 8




Experiment – 4

Title- Sketched based feature tool

Objective- To study the geometry in 3-Dimensional

1-Sketched based features

A- Pad and Multi-pad

B- Pocket and Multi-pocket

C- Shaft

D- Groove

E- Hole

F- Rib

G- Slot

H- Solid Combine

-Multi- Section solid

-Removed Multi-Section solid

2- Dress- Up features

A- Edge fillet

B- Chordal Fillet

C- Face-Face fillet

D- Tri-tangent Fillet

E- Variable fillet

F- Chamfer

G- Draft

H- Draft reflect line

I- Variable angle draft

J- ShellK- Thickness

L- Thread

M- Remove faces

3-Measure tool bar

A- Measure between

B- Measure

C- Measure items

LAB MANUAL: CAD 9




-Any geometry

-Point only

-Edge only

-surface only

Fig- Showing pad and Pocket feature

Fig- Showing the Fillet Feature

Fig- Showing the Shaft, Groove and Shell Feature.

LAB MANUAL: CAD 10




Experiment- 5

Title- Transformation Features

Objective- To learn about the transformation feature that will be used to move, rotate,

mirror, pattern, and scale the selected features and bodies.

1. Transformation Tool bar

A- Translation

B- Symmetry

C- Symmetry

D- Axis to Axis

E- Mirror

F- Rectangular Pattern

G- Circular Pattern

H- User Pattern

I- Scaling

2. Boolean Operations

A- Assemble

B- Add

C- Remove

D- Intersect

E- Union Trim

F- Remove lump

G- Stiffener

H- Solid Combine

Fig- Showing the stiffner feature

LAB MANUAL: CAD 11




EXPERIMENT-6

Title - Introduction to Assembly Design

Objective – To study about the assembly design

1. Assembly Design

An assembly design consists of two or more components assembled together at their

respective position.

2. Workbench Tool bars

You can invoke the assembly design workbench by choosing the new bottom from the

standard tool bar and selecting product from new dialogue box. Alternatively you can

choose start> Mechanical Design> Assembly design from the member tool bar in the

assembly design workbench.

3. Product structure tools tool bar

The tool in the product structure tools tool bar are used to insert an existing part or

assembly in the current product file using the tools in this tool bar

A- Component

B- Product

C- Part

D- Existing component

E- Replace component

F- Graph tree recording

G- Generate numbering

H- Manage representation

I- Fast multi instantiation

4. Constraint tool bar

The constraint tool bar is used to apply the constraint to the components of the assemblyto restrict its degree of freedom with respect to surrounding.

A- Con-incidence constraint

B- Contact- constraint

C- Offset constraint

D- Angular constraint

E- Fix component

F- Fix together

LAB MANUAL: CAD 12




G- Change constraint

H- Reuse pattern

I- Quick constraint

5. Using assembly constraint

This section describes the notations and operating modes you will need to set and use

constraints in your assembly structure.

Constraint allowed you to position mechanically component correctly in relation to the

other components. You need to specify the type of constraints you wish to set up between

two components exactly the way you want.

You can also use constraint to indicate the mechanical relationship between the

components. You can apply constraint any between the child components of the active

components. You cannot define the constraints any between the geometric elements

belonging to the same component. You cannot apply constraint between two components

belonging to the same sub assembly if this sub assembly is not the active component.

LAB MANUAL: CAD 13




Experiment-7

Title- Creation of drawing on sheet

Objective- To study the drawing on sheet (Drafting study)

1. Creating a new drawing

This task will show you how to create more or less automatically a new drawig with pre

defined views generated from a part.

Open the general drafting part

1- Select the start>mechanical design command.

2- Select the drafting workbench.

The new drawing operation dialogue box appears with information on views that can

possibly be created as well as information on the drawing standard

3-Select the views you want to be automatically crated on your drawing from the non

drawing creations dialogue box

4-Click ok

You can modify the drawing standards for this, Click the modification. Be careful, the

new drawing creations dialogue box only displays on the condition you prevously define

the CAT Part document. These are the resulting views genarated as yoy Start created CAT

arrow.

2. Sheets

The generative drafting method provides a simple method for managing a sheet. A sheet

contains main views, a view which supports the geometry directly in the sheet. A

background view. A view dedicated to frames and little blocks, interactive or generated

views.

3. Design of sheet

This task will show you know to define the sheet for a new CAT drawing document and if needed add more sheets.

Before you begin make sure you customized the following

Grid

Deactivate the grid icon from the tool bar

1-Click he new icon from the standard tool bar or selected file new from the menu bar

2-Select the drawing workbench and click ok

3-From the new drawing dialogue box. Select the 150 standard and on 150 format.

LAB MANUAL: CAD 14




4- Select the landscape orientation

5- Select the scale and then click ok.

The sheet size depends upon the standard type of example, if you choose the 150 standard

the sheet will automatically be assigned the A0 format. At any time you can change the

standard sheet format, orientation and or scale to do this select page set up from the menu

bar. If you select the new standard the valve in the apply on field becomes all sheets and

the new standard is applied to all drawing sheets.

LAB MANUAL: CAD 15




Experiment-8

Title- Introduction to surfacing –i

Objective- To study the surfacing tools

The basic tasks you will perform in the wire frame and surface workbench are mainly the

creation of wire frame and surface geometry you will use to build your part design. When

selecting a sketch as the input element some restriction are aplly depending upon the

feature you creating. You should avoid selecting self-intersecting sketches as well as

sketches containg heterogeneous elements such as a curve and a point.

1. Creating Mutiple points--This task shows how to create several points at a time. Click

the points and plane Repetition.

2. Creating planes between other planes- Click the planes Repetition icon. The planes

between dialogue box appears. Select the two palnes between which the new planes must

be created. Specify the number of planes to be craeted between the two selected planes

click ok to create the planes

3. Creating the helix- Click the helix icon. The helix curve definition dialogue box

appears. Select a starting point. Set the helix parameters pitch, height, orientation, starting

angle, taper angle, profile. Click ok to create the helix.

4. Creating corners- click the corner icon. The corner definition dialogue box appears.

Select two curves as reference element. The corner will be created between these two

references. Select the support surface, the resulting corner is curve seen as a arc of circle

lying on a support surface.

5. Creating polylines- click the ployline icon. The polyline definition dialogue box

appears. Select several points in a row to create a polyline. It is possible to add or remove

points on polyline. Click ok in the dialogue box to create the polyline.

6. Creating the circles- Click the icon circle. The circle definition dialogue box appears.Use the combo to choose the desired circle type- centre and radius, bitangent and two

points and radius, three points, Bi-tangent and radius, Bi-tangent and point and tri-tangent.

Enter all input as specified.

7. Creating spline- click the icon spline. The spline definition dialogue box appears.

Select two or more points where the spline is to pass. An updated spline is visualized each

time a point is selected. It is possible to edit the spline by first selecting a point in the

LAB MANUAL: CAD 16




dialogue box list then choosing a button to either add a point after the selected point. You

can select the geometry on support check box and select a support.

8. Creating projections- Click the projection icon. The projection definition dialogue box

appears. Select the element to be projected. You can select several elements to be

projection normal or along a direction and click ok to create the projection.

9. Creating intersections- click the intersection icon. The intersection definition dialogue

box appears. Select the two elements to be intersected. The intersection is displayed.

Choose the type of intersection to be displayed. A curve, point, A contour, A Face. Click

ok to crate the intersection element.

10. Creating Extrude surface- click the extrude icon. The extrude surface definition

dialogue box appears. Select the profile to be extruded and specify the desired extrusion

direction. Enter the numerical value and click the ok to create the extrude surface.

Creating the revolution surface- click the revolve surface icon. Revolution surface

dialogue box appears. Select the profile and line indicating the desired revolution axis.

Enter angle values or use the graphic manipulators to derive the angular limits of the

revolution surface.

11. Creating Spherical surface- Click on the sphere icon from the extrude-revolution

tool bar. The sphere surface definition dialogue box appears. Select the center point of the

sphere. Click on the apply to preview the surface. Modify the sphere radius and the

angular limits as required. Click ok to create the surface.

LAB MANUAL: CAD 17




Experiment-9

Title- Introduction to surfacing –ii

Objective- To study the surfacing tools

1. Creating offset surfaces- click the offset icon and select the surface to be offset.

Specify the offset by entering a value or using the graphic manipulator. An arrow

indicates the proposed direction for the offset. The offset surface display normal to the

reference surface. Click ok to create surface.

2. Creating the swept surfaces

A) Using an explicit profile- Click the sweep icon. The swept surface definition dialogue

box appears. Click the explicit the profile icon. Select planar profile to swept out, select

the guide curve. If needed select the planar and if no spine is selected, the guide curve is

implicit used as spine. In the smooth sweeping section you can check the angular

correction option to smooth the sweeping motion along the reference surface. Click ok to

create the swept surface.

B) Using a linear profile

Click the sweep icon. The swept surface definition dialogue box appears. Click the line

profile icon. The five possible cases two limits, limit and middle, with reference surface,

with reference curve, with tangency surface, with draft direction.

C) Using a circular profile

Click the sweep icon. Click the circle icon, then use the combo to choose the subtype. The

following cases are possible, select three guide curves, select two guide curves and enter a

curves. Select the radius values.

D) Using a conical profile

Click the sweep icon. The swept surface definition dialogue box appears. Click surface

definition dialogue box appears. Click the conical icon and then use the combo to choosethe subtype. Two guides, three guides, four guides, five guides. Click ok to create swept

surface.

3. Creating the filling surface- click the fill icon. Select curves or surface between

dialogue box boundary by first selecting an element in the dialogue box list then choosing

a button to either add a new element after or before the selected one. Remove the selected

element. Replace the selected by another curve. Select a passing point. This point should

lie within the area delimited by the selected curves. Click ok to create the fill surface.

LAB MANUAL: CAD 18




4. Creating blended surfaces- Click the blend icon. Successively select the first curve

and its support then the secured curve and its option to trim them by the curve and

assembly then to the blend surface. You can also specify whether and where the blend

blend bounds arise must be tangent to support boundaries. Set the tension type using the

tension tab and click ok.

5. Splitting geometry- Click the split icon. Select the element to be split you can select

several cutting elements. In that case note that the selection order is important as the area

to be split is defined according to element. The elements to remove and element to keep

operation allow the split operation and then click ok.

6. Trimming geometry- Click the trim icon. Select the two surface or two wireframe

elements to be trimmed. You can also select the portions to be kept by clicking the other

side of element 1 and other side of element 2 buttons. You are advised to use the element

to remove and portions to be kept or removed click ok to trim the surface or wireframe

elements.

7. Extracting geometry- Click the extraction icon chosen the propagation type point

continuity. No propagation or tangent continuity. Click the ok to extract the element.

Translating geometry

Translating icon select the element to be translated the vector definition. Click ok to crate

the translated element. The element is added to the specification tree.

8. Rotating geometry- click the rotate icon. Select the element to be rotated. Select a line

as the rotation axis. Enter a value or the drag manipulator to specify the rotation angle.

Click ok to create the rotated element use the repeat object after ok check several rotated

surface and then click ok

9. Performing a symmetry on geometry- Click the symmetry icon. Select the element to

be transformed by symmetry. Select a point, line or plane as reference element click ok tocreate the symmetrical element.

10. Joining surfaces or curves- Click the icon. Select the surfaces or curves to be joined.

Check the tangency button to find out whether the elements to be joined are tangent.

Check the check convexity button to find out whether the elements to be joined are

convex. Check the check manifold button find out whether the resulting joint is manifold.

Click ok to create the joined surface or curve.

LAB MANUAL: CAD 19




Experiment-10

Title- Introduction to UNI-Graphics

Objective- To get the idea about UNI-Graphics design software

Introduction

Unigraphics is a leading CAD/ CAE/CAM software product developed and marked by

UGS. UGS is headquartered in Eypress, CA, but there are many development sites around

the word where unigraphics, along with other products marketed by UGS are developed.

Note that the primary unigrahics development site is also located in Cypress.

Many of the largest companies in the world use unigraphics to design and manufacture

products that vary everywhere from printing presses to locomotives. From cars and trucks

to the fighter planes.

NX is the commercial CAD/ CAM/ CAE PLM software suite developed by Siemens PLM

software. NX is widely used in the engineering Industry, especially in the automotive and

aerospace sectors NX has same presence in the consumer goods design sector. NX is

parametric solid / surface feature- based modeler. It uses the Para solid geometric

modelling. Kernel NX is direct competitor to CATIA and PRO-E.

Feature of U.G

1.Design Flexibilty- A synchronous technology combining constraint driven technique

with direct modelling is used to provide direct editing in the model creation process.

Further flexibility id provided through

A-Active digital make-up

B-A capacity referred to as active make-up.

2- Multiplat form support

A-Functional strength- NX provides a suit of CAE simulation tightly intergrated with NX

design and merged by team centre designers and analysis can work in a multi-discipline.B- Product Manufacturing information- An important aspect of maintaining a multi-

discipline model is ability to create and transmit product manufacturing information

(PMI) within the CAD model.

3- Productivity enhancement- This referred to as your way which allows the interface to

be customized to specific tasks and skill levels. There are also wizards including to help

streamline and automate complex process.

LAB MANUAL: CAD 20




4- Complexity positioning- The NX product line includes a family of integrated

application intended to support both the product and process complexity inheriting

durable goods industries and particularly in automotive and aerospace.

Unigraphics Co-ordinate system

A- Absolute Co-ordinate system (ABS)- Defines 0,0,0 (in X, Y, Z) in model space and

it is fixed, used as general reference for large assemblies not seen on the screen

B- Work Co-ordinate System (WCS)- A mobile Co-ordinate system that may be moved

around to facilatate the construction of objection.

The WCS is indentified by a letter next ‘C’ next to each of the axes (X,Y,Z).

-Change the origin

-rotate the system (Changes orientation)

-Orient the WCS (rotation and location changes)

C-Featured Co-ordinate system- Created by Unigraphics and stored with the feature

called by UG during editing. It is transparent.

Unigraphics Layer

1- Used to organize modelling file

2- There are 256 layers available in every single part file.

3- A layer is a single piece of transparent film with information on it.

4- At any given time you can only create objects on a single layer, the working layer.

5- Layer can be mode selectable (You can pick and work with objects on layer)

6- Layers can be made visible (You can see, but not pick and work with the item on that

layers.

LAB MANUAL: CAD 21

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