Let us assume that you are drilling eight holes, equally spaced in a bolt-hole circle. That is, there would be holes at 12,3,6, and 9 o'clock and four more holes equally spaced between them. The diameter of the bolt hole circle is 6 in. The designer says that the holes must be 45 ± 1 ° from each other around the circle.
a. Compute the tolerance between hole centers.
b. Do you think a typical multiple-spindle drill setup could be used to make this bolt circle-using eight drills all at once? Why or why not?
c. Do you think that the use of a jig may help improve the situation?