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Introduction to CAD/CAM

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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/ MasterCAMModules on the Web

Groover Mikell,Zimmers W Emory, CAD/CAM Com pu ter AidedDesign and Manufactu r ing , Chapter 2-5, Prentice Hall 1984.

Chang, et al, Compu ter Aided Manufac tu r ing , Chapter 10,Prentice-Hall, 1991.

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

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ExerciseReadiness Assessment Test A.K.A. RAT

AS A INDIVIDUAL , prepare adetailed response for the Readiness

Assessment test found on the web

http://www.engr.psu.edu/cim/ie450/ie450rat4.doc

Open Book / Open Notes

http://www.engr.psu.edu/cim/ie450/ie450rat4.dochttp://www.engr.psu.edu/cim/ie450/ie450rat4.dochttp://www.engr.psu.edu/cim/ie450/ie450rat4.dochttp://www.engr.psu.edu/cim/ie450/ie450rat4.doc

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Objectives

To understand the need for CAD/CAM in LeanManufacturing.

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 adesign.

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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How do CAD/CAM systemswork?

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 generatedfor a generic NC machine

A set of tool paths andpositions can be automatically

generatedThese paths can be edited andmodified

These paths and instructionscan then be posted to aspecific machine

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The Design Process : Then and Now

Before CAD After CAD

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CAD/CAM and the newEnvironment

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Exercise (3-5 mins)

Discuss how CAD/CAM helps in LeanManufacturing? Elaborate on any oneaspect.

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 beginMasterCAM?

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

http://www.mastercam.com/http://www.mastercam.com/

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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 usingMasterCAM

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/CAMpackage? 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 aCAD/CAM system.

Create an economic model that can beused to justify using MasterCAM or asimilar system.

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Getting Started with 2D Drawing

Create simple 2D Geometries using basicshapes say a Rectangle

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Building 2D Geometry

Place and Dimension the Shape

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Creating Shape with Lines andRectangles

Complete the Basic profile. We will now addarcs, 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 with Toolpaths

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 traveldirection

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Defining Tool Parameters Select the Contour type and Tool Parameters Window

pops up. Feed the Right Parameters and Right Click toSelect 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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Toolpath Optimization?

MASTERCAM does NOT give a minimum timeToolpath. It gives the toolpath that has beenselected.

Exercise :

Try out different toolpaths from the toolpaths pallete forthe part in the tutorial. Which one is optimal? Why?