We use G65 on our Star SV Lathes. It looks like this (in Z):
G65P8999A.06B.035C.02R0S-.02Z1.086W.02F.0012D1.5E4.0;
We have this in our posts to output the G65 code with all the right info(thanks Bill C.) when ever we use deep hole drilling.
Attached is the O8999 sub-program(drill macro.txt) and an explanation of how to use it(drill macro example.txt).
There is a parameter in some controls that allow you to change the retract amount to come out of the hole or not. On the Stars it's parameter No. 5101-bit 2. Check your manual or use this sub-program.
As far as G74/G75, never used it. Partmaker is pretty good at setting depth of cut (say .010")for a contour. Make sure your initial stock is set correctly (say .100")(10 rough cuts @ .010" - finish).
drill macro.txt drill macro example.txt