I am trying to cut 5/8-18 threads on a SL-20 and not having very good luck. The work piece is a socket head cap screw with the head cut off to make a stud. I am only getting maybe 2 parts before the insert chips the very end of the point off and makes a bad thread. I am running 500RPM with coolant. This is only the 2nd or 3rd time in 8 years I have cut threads on a CNC lathe, so I may be missing something obvious to someone with experience.
Does the G76 cycle feed the tool straight in, or does it feed in at 30* to cut on one edge of the tool? I see in the manual there is an "A" value that can be added to my G76 line for tool nose angle. Does this make the insert feed in at an angle? I currently do not have an A value in the program.
Thanks!