When an odd number of holes is involved, or when
the holes are not spaced symmetrically with respect to the reference axes, a
separate X, Ycoordinate calculation I necessary for each hole.
EXERCISES
22.16
Solve
for the jig-bore coordinate distances for the number of equally spaced holes
and the hole circle diameters indicated:
a)
Five
holes on an 8-inch diameter hole circle.
b)
Ten holes on a 12-inch diameter hole circle.
c)
Six
holes on an 8-inch diameter hole circle.
d)
Seven
holes on a 10-inch diameter hole circle.
e)
Twelve
holes on a 12-inch diameter hole circle.
22.17
Solve
for the numerical control coordinate distances for the number of equally spaced
holes indicated for the specified hole circle diameters (one or more holes on a
center line):
a)
Seven
holes on a 10-inch diameter hole circle.
b)
Three
holes on a 5-inch diameter hole circle.
c)
Six
holes on an 8-inch diameter hole circle.
d)
Twelve
holes on a 12-inch diameter hole circle.
e)
Ten holes on a 6-inch diameter hole circle.
22.18
The
plate shown in Figure 22.13 is to have two holes bored using a boring machine.
After hole
A
is bored, the table of the
machine is moved in two directions,
X
and
Y
, to locate hole
B
. Find the distances
X
and
Y
when line
AB
and
∠
A
have the following measurements:
F
IGURE
22.13
22.19
Nine holes are equally spaced around the 7.125-inch diameter
bolt circle shown in Figure 22.14. Find the chordal distance between the
following holes:
F
IGURE
22.14
22.20
Seven
holes are equally spaced on the 114.30 mm bolt circle shown in Figure 22.15.
They are to be checked by measuring the distances
AB
and
AC
. Determine these distances.
F
IGURE
22.15
22.21
Five
equally spaced holes are on the 6.435 inch bolt circle shown in Figure
22.16. Find the indicated chordal distances:
F
IGURE
22.16
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