Autocad Instructions for Creating Primitives and Solids, Slides of Computer-Aided Design for Engineers

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Solid

Modeling - 2

Learning Goals

• Describe How AutoCAD SOLIDs differ from

WireFrames and Surfaces

• Create AutoCAD “Primitive” Solids
  • Box, Wedge, Cylinder, Sphere, etc.
• Slice and Section 3D Solids
• Use ACAD “Boolean” Operations to create

Solids

• Interfere, Union, Subtract
• Combine Primitives to Make new Solids

Recall The Primitive Solids

Move Primitives into Position

• Make use of geometry of the object
  • Object snap (Osnap)
  • endpoint, midpoint, center, quadrant, etc.
  • cursor menu (Shift - right click)
• Move command (2D)
• 3D commands to rotate, mirror, align, and

array

AutoCAD Solid Model

• Create object primitives (box, cylinder, wedge,

etc.)

• Move into place with 3D commands
• Boolean (union, subtract, Interfere) to create

single solid

• Create object with efficient sequence of

operations (plan ahead!!)

EX16-

EX16-

MILLIMETERS

EX16-24-

• Draw Box

Command: box Specify corner of box or [CEnter] <0,0,0>: Specify corner or [Cube/Length]: l Specify length: 35 Specify width: 30 Specify height: 13

 Draw 2 Cylinders

Command: cylinder Current wire frame density: ISOLINES= Specify center point for base of cylinder or [Elliptical] <0,0,0>: mid of Specify radius for base of cylinder or [Diameter]: d Specify diameter for base of cylinder: 30 Specify height of cylinder or [Center of other end]: 13

Command: cylinder Current wire frame density: ISOLINES= Specify center point for base of cylinder or [Elliptical] <0,0,0>: cen of Specify radius for base of cylinder or [Diameter]: d Specify diameter for base of cylinder: 13 Specify height of cylinder or [Center of other end]: 13

EX16-24-

• Add & Subtract
  • UNION of BOX & Lg-

CYLINDER

• SUBTRACT Small-

CLYINDER

 Pick Objects with

Mouse

Command: union Select objects: 1 found Select objects: 1 found, 2 total Select objects: Command: subtract Select solids and regions to subtract from .. Select objects: 1 found Select objects: Select solids and regions to subtract .. Select objects: 1 found Select objects: Command:

EX16-24-

• Move UCS to Face of

Tall Box

 Rotate Axes with 3Pt

Command: ucs Current ucs name: WORLD Enter an option [New/Move/orthoGraphic/Prev/Restore /Save/Del/Apply/?/World] : m Specify new origin point or [Zdepth]<0,0,0>: Command: ucs Current ucs name: NO NAME Enter an option [New/Move/orthoGraphic/Prev/Restore /Save/Del/Apply/?/World] : n Specify origin of new UCS or [ZAxis/3point/OBject/Face/View/X/Y/ Z] <0,0,0>: 3p Specify new origin point <0,0,0>: Specify point on positive portion of X-axis <1.0000,0.0000,0.0000>: Specify point on positive-Y portion of the UCS XY plane <0.0000,1.0000,0.0000>:

EX16-24-

• Locate Ø16 Hole-Ctr

with xLines & OffSet

 Can Only OffSet in

UCS X-Y Plane

Command: xl XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: Specify through point: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: Specify through point: Specify through point: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] : 12 Select a line object: Specify side to offset: Select a line object: Command: XLINE Specify a point or [Hor/Ver/Ang/Bisect/Offset]: o Specify offset distance or [Through] <12.0000>: 15 Select a line object: Specify side to offset: Select a line object:

EX16-24-

• Add & Subtract
  • UNION of Main-Part &

Tall Box

• SUBTRACT Ø Cyl

 Use HIDE For

Visualization

Command: union Select objects: 1 found Select objects: 1 found, 2 total Select objects: Command: subtract Select solids and regions to subtract from .. Select objects: 1 found Select objects: Select solids and regions to subtract .. Select objects: 1 found Select objects: Command: Command: Command: _hide Regenerating model.

• EX16-

EX16-19-

• Make Cyl’s

Command: cylinder Current wire frame density: ISOLINES= Specify center point for base of cylinder or [Elliptical] <0,0,0>: Specify radius for base of cylinder or [Diameter]: d Specify diameter for base of cylinder: 40 Specify height of cylinder or [Center of other end]: 30  Move & Union Cyls

w/ Osnap to Make

Stepped Shaft

EX16-19-

Command: CYLINDER Current wire frame density: ISOLINES= Specify center point for base of cylinder or [Elliptical] <0,0,0>: