Chapter 8 Creating and Working with Solid Model Features
205
Copyright Goodheart-Willcox Co., Inc.
and subtract it from the base or you can chamfer the top edge of a hole. Chamfering is
the quickest method.
1. Draw a cylinder representing the diameter of the hole, Figure 8-31A.
2. Subtract the cylinder from the base object.
3. Select the
CHAMFER
or
CHAMFEREDGE
command.
4. If using the
CHAMFER
command, select the top edge of the base object, enter the
chamfer distance(s), and pick the top edge of the hole, Figure 8-31B.
5. If using the
CHAMFEREDGE
command, pick the top edge of the hole and enter the
chamfer distance(s). Preview the result before completing the operation.
Boss
A boss serves the same function as a spotface. However, it is an area raised above
the surface of an object. Draw a boss as follows.
1. Draw a cylinder representing the diameter of the hole. Extend it above the base
object higher than the boss is to be, Figure 8-32A.
Hole
A B C
Counterbore
Figure 8-29.
Constructing a
counterbore.
A—Draw a cylinder
to represent a hole.
B—Draw a second
cylinder to represent
the counterbore.
C—Subtract the two
cylinders from the
base object.
Subtract
A B
Figure 8-30.
Constructing a spotface.
A—The bottom of the
second, larger-diameter
cylinder should be
located at the exact
depth of the spotface.
However, the height
may extend above the
surface of the base.
Then, subtract the two
cylinders from the base.
B—The finished solid.
Edge to
chamfer
A B
Figure 8-31.
Constructing a
countersink. A—
Subtract the cylinder
from the base to
create the hole. B—
Chamfer the top of
the hole to create a
countersink.