Engineering 22
Solid
Modeling - 2
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22 – Engineering Design Graphics
1
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
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
Engineering 22 – Engineering Design Graphics
2
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Constructive Solid Geometry (CSG)
 Standard “primitive” shapes
 AutoCAD has six primitives:
• box, wedge, cone, cylinder, torus, sphere
 Primitives are moved into place with 3D
commands to assemble object
 Primitive are combined with boolean
commands:
• union, subtract, interfere
Engineering 22 – Engineering Design Graphics
3
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Recall The Primitive Solids
Engineering 22 – Engineering Design Graphics
4
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
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
Engineering 22 – Engineering Design Graphics
5
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Construct Primitives in Place
 Use Osnap to locate starting point of
primitive on existing geometry
 Position UCS to locate starting point
 Reorient UCS to construct cylinders and
wedges
 Cylinder - height in Z axis
 Wedge - point in X axis (and Z axis)
Engineering 22 – Engineering Design Graphics
6
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
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!!)
Engineering 22 – Engineering Design Graphics
7
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24
EX16-24
MILLIMETERS
Engineering 22 – Engineering Design Graphics
8
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24 Game Plan
 Make 13x30x35 Box
 Make Solid Cyl →
Ø30 O.D. x 13H
 Move Cyl to TopEnd of Box
 Union Box & Cyl
 Make Box 13x30x37
 Move new Box to
Position & Union
Engineering 22 – Engineering Design Graphics
9
 Locate w/ xLines
cen of Ø16 Hole
 Move & Orient UCS
at Ø16 Hole
Location
 Construct Ø16 x
13H Solid Cyl
 Subtract Ø16 Cyl
from Previous
Construction
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-01
 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
Engineering 22 – Engineering Design Graphics
10
Command: cylinder
Current wire frame density:
ISOLINES=18
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
 Draw 2 Cylinders
Command: cylinder
Current wire frame density:
ISOLINES=18
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 ofBruce
cylinder
or
Mayer, PE
[Center
of other
end]: 13
BMayer@ChabotCollege.edu
• ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-02
 Add & Subtract
• UNION of BOX & LgCYLINDER
• SUBTRACT SmallCLYINDER
Engineering 22 – Engineering Design Graphics
11
 Pick Objects with
Mouse
Command: union
Select objects: 1
Select objects: 1
total
Select objects:
Command: subtract
Select solids and
subtract from ..
Select objects: 1
Select objects:
Select solids and
subtract ..
Select objects: 1
Select objects:
Command:
found
found, 2
regions to
found
regions to
found
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-03
 Make Tall Box, and
Move into Position
 Pick Objects with
Mouse
Engineering 22 – Engineering Design Graphics
12
 For Move locate
corners using OSnap
Command: box
Specify corner of box or
[CEnter] <0,0,0>: <Snap on>
Specify corner or
[Cube/Length]: l
Specify length: 30
Specify width: 13
Specify height: 37
Command: m
MOVE
Select objects: 1 found
Select objects:
Specify base point or
[Displacement] <Displacement>:
Specify second point or
<use first point as
displacement>:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-04
 Move UCS to Face
of Tall Box
Engineering 22 – Engineering Design Graphics
13
 Rotate Axes with 3Pt
Command: ucs
Current ucs name: *WORLD*
Enter an option
[New/Move/orthoGraphic/Prev/Restore
/Save/Del/Apply/?/World]
<World>: m
Specify new origin point or
[Zdepth]<0,0,0>: <Osnap on>
Command: ucs
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore
/Save/Del/Apply/?/World]
<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>:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-05
 Locate Ø16 Hole-Ctr
with xLines & OffSet
 Can Only OffSet in
UCS X-Y Plane
Engineering 22 – Engineering Design Graphics
14
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] <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:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-06
 Draw Cylinder
Command: cylinder
Current wire frame density:
ISOLINES=18
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: 16
Specify height of cylinder or
[Center of other end]: -13
 Note: Cyl-Hgt is
NEGATIVE
Engineering 22 – Engineering Design Graphics
15
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-24-07
 Add & Subtract
• UNION of Main-Part
& Tall Box
• SUBTRACT Ø Cyl
Engineering 22 – Engineering Design Graphics
16
 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
Bruce Mayer, PE
model.
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19
Engineering 22 – Engineering Design Graphics
17
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19 Game Plan
 Make Two Cylinders
• Ø40x30L
• Ø28x50L
 Union the Two Cyls
to make a “Stepped”
Shaft
 Make Box 60 X 40W
x (40-19 = 21)H
 Locate Box Position
on Stepped Shaft
Engineering 22 – Engineering Design Graphics
18
 Subtract Box from
Stepped Shaft
• Creates the “Flat” 19
Above the bottom
 Erase Box
 Make Ø12 Cylinder
thru Flat
 Subtract Cyl from
the structure
 Erase Cyl
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-01
 Make Cyl’s
 Move & Union Cyls
w/ Osnap to Make
Stepped Shaft
Engineering 22 – Engineering Design Graphics
19
Command: cylinder
Current wire frame density:
ISOLINES=24
Specify center point for base of
cylinder or [Elliptical] <0,0,0>:
<Snap on>
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
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-02
Engineering 22 – Engineering Design Graphics
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Command:
CYLINDER
Current wire frame density: ISOLINES=24
Specify center point for base of cylinder
or [Elliptical] <0,0,0>: <Osnap off>
<Object Snap Tracking off> <Osnap on>
<Osnap off>
Specify radius for base of cylinder or
[Diameter]: d
Specify diameter for base of cylinder: 28
Specify height of cylinder or [Center of
other end]: 60
Command: m
MOVE
Select objects: 1 found
Select objects:
Specify base point or [Displacement]
<Displacement>: cen
of Specify second point or <use first point
as displacement>: cen
of
Command: union
Select objects: 1 found
Select objects: 1 found, 2 total
Select objects: *Cancel*
Bruce Mayer, PE
Command
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-03
 Make Box and
Locate Box Position
with xLines
Engineering 22 – Engineering Design Graphics
21
Command: box
Specify corner of box or [CEnter]
<0,0,0>:
Specify corner or [Cube/Length]: l
Specify length: 40
Specify width: 21
Specify height: 60
Command: xl
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: cen
of
Specify through point:
Specify through point:
Command:
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: o
Specify offset distance or [Through]
<1.0000>: 5
Select a line object:
Specify side to offset:
Select a line object:
Command: xl
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: cen
of
Bruce Mayer, PE
Specify through point:
BMayer@ChabotCollege.edu
Specify
through• ENGR-22_Lec-29_SolidModel-2.ppt
point:
EX16-19-04
 Move Box and
Subtract
Command: m
MOVE
Select objects: 1 found
Select objects:
Specify base point or
[Displacement] <Displacement>:
Specify second point or
<use first point as
displacement>:
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:
Engineering 22 – Engineering Design Graphics
22
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-05
 Move UCS to
Locate and
Create Ø12 Hole
Engineering 22 – Engineering Design Graphics
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Command: xl
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: mid
of
Specify through point:
Specify through point:
Command: xl
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: mid
of
Specify through point:
Specify through point:
Command: *Cancel*
Command: ucs
Current ucs name: *WORLD*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/S
ave/Del/Apply/?/World]
<World>: n
Specify origin of new UCS or
[ZAxis/3point/OBject/Face/View/X/Y/Z]
<0,0,0>:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-06
 Move UCS to
Locate and
Create Ø12 Hole
Engineering 22 – Engineering Design Graphics
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Command:
UCS
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/S
ave/Del/Apply/?/World]
<World>: n
Specify origin of new UCS or
[ZAxis/3point/OBject/Face/View/X/Y/Z]
<0,0,0>: x
Specify rotation angle about X axis
<90>: -90
Command: cylinder
Current wire frame density:
ISOLINES=24
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: 12
Specify height of cylinder or [Center
of other end]: 22
Command:
Command:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-07
 Subtract Ø12 Cyl,
and Chamfer Front
Edge
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:
Engineering 22 – Engineering Design Graphics
25
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-08
 Subtract Ø12 Cyl,
and Chamfer Front
Edge
Engineering 22 – Engineering Design Graphics
26
Command: chamfer
(TRIM mode) Current chamfer Dist1 =
0.0000, Dist2 = 0.0000
Select first line or
[Undo/Polyline/Distance/Angle/Trim/mE
thod/Multiple]: d
Specify first chamfer distance
<0.0000>: 5
Specify second chamfer distance
<5.0000>:
Select first line or
[Undo/Polyline/Distance/Angle/Trim/mE
thod/Multiple]:
Base surface selection...
Enter surface selection option
[Next/OK (current)] <OK>:
Specify base surface chamfer distance
<5.0000>:
Specify other surface chamfer
distance <5.0000>:
Select an edge or [Loop]: Select an
edge or [Loop]:
Command:
Command:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19-09
 Rotate UCS and
Object to set
SEISO View
Engineering 22 – Engineering Design Graphics
27
Command: ucs
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/S
ave/Del/Apply/?/World]
<World>: m
Specify new origin point or
[Zdepth]<0,0,0>: mid
of
Command:
Command:
Command: _plan
Enter an option [Current
ucs/Ucs/World] <Current>:
Regenerating model.
Command: rotate
Current positive angle in UCS:
ANGDIR=counterclockwise ANGBASE=0
Select objects: 1 found
Select objects:
Specify base point: 0,0
Specify rotation angle or
[Copy/Reference] <0>: 90
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Command: ucs
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?
/World]
<World>: n
Specify origin of new UCS or
[ZAxis/3point/OBject/Face/View/X/Y/Z] <0,0,0>: y
Specify rotation angle about Y axis <90>: 90
Command: rotate
Current positive angle in UCS:
ANGDIR=counterclockwise ANGBASE=0
Select objects: 1 found
Select objects:
Specify base point: 0,0
Specify rotation angle or [Copy/Reference] <90>: -90
Command: ucs
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?
/World]
<World>: n
Specify origin of new UCS or
[ZAxis/3point/OBject/Face/View/X/Y/Z] <0,0,0>: x
Specify rotation angle about X axis <90>: 90
Bruce Mayer, PE
Engineering 22 – Engineering Command
Design Graphics
EX16-19-10
 Rotate UCS and
Object to set
SEISO View
28
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-19 Result
 WireFrame HIDE
Engineering 22 – Engineering Design Graphics
29
 Gourand SHADE
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Demo → EX16-37
GAME PLAN

Use TopView from
Lecture15 as Base
of Object

Extrude to 2.50
High

Slice at 45°

Locate Hole Ctr
and make ؽ
Cylinder
EX16-37 INCHES
Engineering 22 – Engineering Design Graphics
30
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Game Plan cont.
 Subtract ؽ From
Main Block
 Make 1x0.25x0.75
Box and move into
place on Main Block
 Move Prism into
place on Main Block
and Subtract
 Subtract Box From
Main Block
 Make Triangular
Prism of height 2.5
Engineering 22 – Engineering Design Graphics
31
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-37-01
 Use PEdit to Make
Base form in
PolyLine to Extrude
• Start with
Demo_EX16-37_StartFrom_EX5-1111.dwg
Engineering 22 – Engineering Design Graphics
32
Command: pedit
Select polyline or [Multiple]:
Object selected is not a polyline
Do you want to turn it into one?
<Y>
Enter an option
[Close/Join/Width/Edit
vertex/Fit/Spline/Decurve/Ltype
gen/Undo]: j
Select objects: 1 found
Select objects: 1 found, 2 total
Select objects: 1 found, 3 total
Select objects: 1 found, 4 total
Select objects: 1 found, 5 total
Select objects: 1 found, 6 total
Select objects: 1 found, 7 total
Select objects:
7 segments added to polyline
Enter an option
[Open/Join/Width/Edit
vertex/Fit/Spline/Decurve/Ltype
gen/Undo]:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-37-02
 Extrude PLine to
2.5H
 Enclose in Bounding
Box
 xLines to Define
Slice-Plane Pts
Engineering 22 – Engineering Design Graphics
33
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-37-03
 Use Slice to Cut
Form at 45°
Command: slice
Select objects: 1 found
Select objects:
Specify first point on slicing
plane by
[Object/Zaxis/View/XY/YZ/ZX/3poin
ts]
<3points>:
Specify second point on plane:
Specify third point on plane:
Specify a point on desired side
of the plane or [keep Both
sides]:Command
Engineering 22 – Engineering Design Graphics
34
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Current ucs name: *NO NAME*
Enter an option
[New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/
?/World]
<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
<2.6300,0.5000,0.0000>:
Specify point on positive-Y portion of the UCS XY
plane <1.6300,1.5000,0.0000>:
Command: xl
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: o
Specify offset distance or [Through] <Through>: .88
Select a line object:
Specify side to offset:
Select a line object:
Specify side to offset: *Cancel*
Command:
XLINE Specify a point or
[Hor/Ver/Ang/Bisect/Offset]: o
Specify offset distance or [Through] <0.8800>: 1.06
Select a line object:
Bruce Mayer, PE
Engineering 22 – Engineering Design
Graphics
Specify
side to offset:
35
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Select a line object:
EX16-37-04
 Locate Hole Center
on Slant-Face
EX16-37-05
 Draw Long Cylinder
thru Block
Engineering 22 – Engineering Design Graphics
36
Command: cylinder
Current wire frame density:
ISOLINES=24
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: .5
Specify height of cylinder or
[Center of other end]: -3
Command:
Command:
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-37-06
 Subtract Cyl from
Block to complete
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:
Engineering 22 – Engineering Design Graphics
37
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX16-37 Result
 Today
Engineering 22 – Engineering Design Graphics
38
 Lec15 Sketch
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
OrthoViews From Solid
Engineering 22 – Engineering Design Graphics
39
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
All Done for Today
EX16-37:
One
Last Look
Engineering 22 – Engineering Design Graphics
40
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
Engr/Math/Physics 25
Appendix
f x   2 x  7 x 
9x  6
3
2
Bruce Mayer, PE
Licensed Electrical & Mechanical Engineer
BMayer@ChabotCollege.edu
Engineering 22 – Engineering Design Graphics
41
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt
EX15-4.1
Command: _ai_box
Initializing... 3D Objects
loaded.
Specify corner point of box:
<Snap on>
Specify length of box: 6
Specify width of box or [Cube]:
5
Specify height of box: 2
Specify rotation angle of box
about the Z axis or
[Reference]:
 Make Blue Obj
Layer
Command:
Command: _-view Enter an option
[?/Categorize/lAyer
state/Orthographic/Delete/Resto
re/Save/Ucs/Window]: _swiso
 Box in WCS
Engineering 22 – Engineering Design Graphics
42
Bruce Mayer, PE
BMayer@ChabotCollege.edu • ENGR-22_Lec-29_SolidModel-2.ppt