Write a main program and a subprogram for the following machining operation and turn in: a. First, drill 9 holes with tool# l and .257" drill on an Aluminum box tube, the Z-direction depth of the holes are .3 inches. Use right top corner as the program reference zero (PRZ). b. Then create 5/16 -18 NC threads using a tap as tool# 2 on those drill holes, the Z depth of the tapping is .6 inches.
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