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Introduction to CAD/CAM

using MasterCAM

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Agenda

Introduction to CAD/CAM

Introduction to MASTERCAM

2D CAD using MASTERCAM Tool Path Planning in MASTERCAM

Tool Path Optimization

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Readings

http://130.203.243.91/Lab%20Manuals%20Test%20Site/Frameset.htm

Go through the Tutorial/ MasterCAM

Modules on the Web

Groover Mikell,Zimmers W Emory, CAD/CAM Computer Aided

Design and Manufacturing, Chapter 2-5, Prentice Hall 1984.

Chang, et al, Computer Aided Manufacturing, Chapter 10,

Prentice-Hall, 1991.

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Objectives

To understand the need for CAD/CAM in Lean

Manufacturing.

To be able to create 2D Geometries in

MASTERCAM

To be able to create 2D toolpaths in

MASTERCAM

To use MASTERCAM for identifying optimumtoolpaths

To generate NC codes using MASTERCAM

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CAD/CAM

Computer-aided design (CAD) is the use ofcomputer systems to assist in the creation,modification, analysis, or optimization of a

design.

Computer-aided manufacturing (CAM) is the useof computer systems to plan, manage, and

control the operations of a manufacturing plantthrough direct or indirect computer interface withplants resources.

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Need for CAD/CAM

To increase productivity of the designer

To improve quality of the design

To improve communications

To create a manufacturing database

To create and test toolpaths and optimize them

To help in production scheduling and MRP models

To have effective shop floor control

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How do CAD/CAM systems

work? Developing NC code requires an understanding of:

1. Part geometry

2. Tooling

3. Process plans

4. Tolerances

5. Fixturing

Most CAD/CAM systems provide access to:

1. Part geometry

2. Tooling

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Instructions can be generated

for a generic NC machineA set of tool paths and

positions can be automatically

generated

These paths can be edited and

modified

These paths and instructions

can then be posted to a

specific machine

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The Design Process : Then and Now

Before CAD After CAD

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CAD/CAM and the new

Environment

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Exercise (3-5 mins)

Discuss how CAD/CAM helps in Lean

Manufacturing? Elaborate on any one

aspect.

What advantages does CAD/CAMapproach offer in NC Programming?

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CAD/CAM Support

AutoCAD 200i

Pro Engineer 2001

MasterCAM

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What do I need to begin

MasterCAM? Part geometry

Draw or import

Tooling Library or create

Process plans

Fixtures Define orientation and location

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MasterCAM

Mastercam is a three-dimensionalgeometry creation engine along withfeatures to aid in tool path generation andverification.

MasterCAM allows tool path planning andNC code generation for a given part. This

part can either be drawn in MasterCAM orimported from other CAD packages

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MasterCAM Drawing

Geometrical part drawing

In-built CAD package

Two-dimensional parts

Three-dimensional parts

Translators (include)

IGES (international Graphics Exchange Standard)

DXF (AutoCad) CADL (CADKey)

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Tool Path Generation using

MasterCAM Tool path generation

Extensive Tool library

Machining parameter selection NC program generator

Animation to visualize machining operations

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Exercise (individual)

Is it always good to use a CAD/CAM

package? Why?

What are the advantages of using aCAD/CAM system?

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Exercise (Group)

Develop a set of rules as to when to use a

CAD/CAM system.

Create an economic model that can beused to justify using MasterCAM or a

similar system.

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Getting Started with 2D Drawing

Create simple 2D Geometries using basic

shapes say a Rectangle

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Building 2D Geometry

Place and Dimension the Shape

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Creating Shape with Lines and

Rectangles Complete the Basic profile. We will now add

arcs, fillets and trim entities

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Adding Arcs, Radius and Fillets Click on Main Menu [Create- Arc-pt dia cir] on to

dimension and place arcs/circles

Click on Main Menu [Create-Fillets] to create Fillets.

Dimension them Suitably.

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Completing our Mock Profile To Trim or Cut entities Main Menu [Modify-Trim-2

Entities] to get required profile.

Dont forget to Save your file

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Getting started withToolpaths

Click on Main Menu [Toolpaths]. MasterCAM liststhe different machining operations

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Contouring Options

By Selecting Contour the various Contouring Options are listed.

Select Chain and the geometry chains up and shows tool travel

direction

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Defining Tool Parameters

Select the Contour type and Tool Parameters Windowpops up. Feed the Right Parameters and Right Click to

Select Specific Tools.

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Selecting the Tools MasterCAM has a whole range of tools in a tool library from which

tool selections can be made. Now feed the correct parameters.

You can also specify your own tools.

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Displaying Toolpaths Once both the Tool parameters and Contour Parameters have been

Correctly defined. Click Ok to display the Toolpath.

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ToolpathOptimization?

MASTERCAM does NOT give a minimum time

Toolpath. It gives the toolpath that has been

selected.

Exercise :

Try out different toolpaths from the toolpaths pallete for

the part in the tutorial. Which one is optimal? Why?