AutoCAD Tutor SolidModel

8/10/2019 AutoCAD Tutor SolidModel

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3D Modeling Basics

Wireframe models

Surface models

Solid models


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Wireframe Model

Represents edge of actualobject

Surfaces of object are notdefined

Transparency and novolume

2D objects in 3D space Use Line, Circle, Arc


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Surface Model

Edges and surfaces are defined

Object has volume but no mass

Each surface is constructed individually

Each surface is created / move to thecorrect orientation w.r.t other surfaces

Easier to visualize than wireframe

Can be displayed in wireframe or hiddenview

Draw / Surfaces

Command: _hide


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Solid Model

A complete computerized replica of the actualobject

Complete surfaces, edges, interior features ofthe object

Object has volumeand mass

Can be displayed in wireframeor hidden view

Constructing primitive shapes

Using Boolean operations to create composite solid


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Constructive Solid Geometry

(CSG) TechniquesPrimitive SolidsDraw / Solids

Box Cone Cylinder Extrude Revolve Sphere Torus Wedge

Boolean OperationsModify / Solid Editing

Union

Joins selected solids

Subtract Subtract one set of solids

from another Intersect

Create a solid ofintersection (commonvolume) from theselected solids

+


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Part Sample(to be used in CAM section)

SW Isometric View


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Part Sample(to be used in CAM section)

Top View


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Common Operations

DrawingEnvironments

Metric unit orientation

Set the drawing limit Set isometric

viewpoint

Primitive Solids and2D Object

Solid boxes

Cylinders

Rectangular

Object Modification

Fillet

Extrude

Subtract

Union

Move

Dimensioning


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Step 0: Setup theenvironment

Set the environment at startup

Metric setting

Viewing in 3D View / 3D Views / SW

Isometric

Select common operations

from Toolbar View / Toolbars

Select Solid Editing, ViewPoint, Object Snap, Modify,


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Step 1: Solid box

Create solid boxat 0,0,0

Define size of thebox: 50,50,15

x, y, z coordinate


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Step 2: Solid from 2D object

Create separate object (2D

rectangularwith the size 44,

44

Round one corner: Fillet

(radius of 22)

Create a solid object using

Extrudefeature

Draw / Solid / Extrude

Height: 5; Taper: 0)


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Step 3: Solid cylinders

Create separate solid objects: 2 Cyl inders:Diameter1 = 20; Diameter2 = 10; Heigh t = 5

Use Subtractcommand to create a hole (Modify / Solid editing)


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Step 4: Move Objects

Moveroundedsquare object tothe base part Use object snap

to help locate thepositions

Subtractsmallbox from thebigger box


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Step 5: Move objects

Movea cylinder

object to an

appropriate

position Move at the base

of the cylinder to22,22,10

Combine(Union)

2 objects


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Step 6: Round Corners

Round the

edges using

Fil let (radius

of 2)


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CAD Assignment

Guidelines and Minimum Requirements

Section 1: Part Design

Each student has to select and design an applicable part that satisfies the followingconditions:

- The part must serve a least one practical purpose.

- The part must be a single solid object

- The overall dimension must not exceed W20cm xL20cm x H20cm

- The part should have at least one curve surface

- The part should have at least one hole (e.g., cylinder hole, rectangular hole, cone)

- At least one corner of the part must be rounded with indicated dimensions.

- The part should have one island

- All dimensions have to be indicated in either isometric view or in several 2

dimensional views.


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CAD Assignment

The part should be able to be machined by at least two of the followingoperations (but not limit to):

Milling, Turning, Wire cutting EDM, Die sinking, Threading, Drilling, Boring,Bending

Cleary indicate the type of material for your designed part.

Clearly indicate your name and last name in the drawing. It can bewritten directly on the designed part or within the drawing area.


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CAD Assignment

Section 2: Written Report Each student has to submit one written report that thoroughly explains the design

steps of the part. Step-by-step instructions accompanied with figures are required.The report must also explain the machining operations of the designed parts.

Ground Rules and Policies Students are required to submit CAD assignment package which include a CAD file

in floppy disk (one diskette for one file) and a written report. Clearly label yourname and student ID on the submitted floppy disk and report.

The CAD assignment packagedues at

4 p.m. on December 28, 05 (Wednesday).

4 p.m. on February 8, 2006 (Wednesday)

No late assignment is accepted.

This assignment must be an individual work. Do not copy your friends. Anyassignment in question will receive a zero score for CAD section. And no rework of

any kind is accepted.

AutoCAD Tutor SolidModel

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