206
AutoCAD and Its Applications—Advanced
Copyright Goodheart-Willcox Co., Inc.
2. Draw a second cylinder the diameter of the boss. Place the base of this cylinder
above the top surface of the base object a distance equal to the height of the boss.
Give the cylinder a negative height value so that it extends inside of the base object,
Figure 8-32B.
3. Union the base object and the second cylinder (boss). Subtract the hole from the
unioned object, Figure 8-32C.
4. Fillet the intersection of the boss with the base object, Figure 8-32D.
O-Ring Groove
An O-ring is a circular seal that resembles a torus. It sits inside of a groove constructed
so that part of the O-ring is above the surface. An O-ring groove can be constructed by
placing the center of a circle on the outside surface of a cylinder. Then, revolve the circle
around the cylinder. Finally, subtract the revolved solid from the cylinder.
1. Construct the cylinder to the required dimensions, Figure 8-33A.
2. Rotate the UCS on the X axis (or appropriate axis).
3. Draw a circle with a center point on the surface of the cylinder, Figure 8-33B.
4. Revolve the circle 360° about the center of the cylinder, Figure 8-33C.
5. Subtract the revolved object from the cylinder, Figure 8-33D.
PROFESSIONAL TIP PROFESSIONAL TIP
In many cases, you will draw the O-ring as a torus. A copy of the torus can be used
to create the O-ring groove instead of revolving a circle as described in the previous
section.
A B C D
Figure 8-32.
Constructing a boss. A—Draw a cylinder for the hole so it extends above the surface of the
object. B—Draw a cylinder the height of the boss on the top surface of the object. C—Union
the large cylinder to the base. Then, subtract the small cylinder (hole) from the unioned
objects. D—Fillet the edge to form the boss.
A B C D E
Figure 8-33.
Constructing an O-ring groove. A—Construct a cylinder; this one has a round placed on
one end. B—Draw a circle centered on the surface of the cylinder. C—Revolve the circle 360°
about the center of the cylinder. D—Subtract the revolved object from the cylinder.
E—The completed O-ring groove.
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206
AutoCAD and Its Applications—Advanced
Copyright Goodheart-Willcox Co., Inc.
2. Draw a second cylinder the diameter of the boss. Place the base of this cylinder
above the top surface of the base object a distance equal to the height of the boss.
Give the cylinder a negative height value so that it extends inside of the base object,
Figure 8-32B.
3. Union the base object and the second cylinder (boss). Subtract the hole from the
unioned object, Figure 8-32C.
4. Fillet the intersection of the boss with the base object, Figure 8-32D.
O-Ring Groove
An O-ring is a circular seal that resembles a torus. It sits inside of a groove constructed
so that part of the O-ring is above the surface. An O-ring groove can be constructed by
placing the center of a circle on the outside surface of a cylinder. Then, revolve the circle
around the cylinder. Finally, subtract the revolved solid from the cylinder.
1. Construct the cylinder to the required dimensions, Figure 8-33A.
2. Rotate the UCS on the X axis (or appropriate axis).
3. Draw a circle with a center point on the surface of the cylinder, Figure 8-33B.
4. Revolve the circle 360° about the center of the cylinder, Figure 8-33C.
5. Subtract the revolved object from the cylinder, Figure 8-33D.
PROFESSIONAL TIP PROFESSIONAL TIP
In many cases, you will draw the O-ring as a torus. A copy of the torus can be used
to create the O-ring groove instead of revolving a circle as described in the previous
section.
A B C D
Figure 8-32.
Constructing a boss. A—Draw a cylinder for the hole so it extends above the surface of the
object. B—Draw a cylinder the height of the boss on the top surface of the object. C—Union
the large cylinder to the base. Then, subtract the small cylinder (hole) from the unioned
objects. D—Fillet the edge to form the boss.
A B C D E
Figure 8-33.
Constructing an O-ring groove. A—Construct a cylinder; this one has a round placed on
one end. B—Draw a circle centered on the surface of the cylinder. C—Revolve the circle 360°
about the center of the cylinder. D—Subtract the revolved object from the cylinder.
E—The completed O-ring groove.

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