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hi'ya martin, not 100% sure but see att.pdf, it's a long time since I did anything on an ELU-kelef WARNING check your +/- directions and abs/inc in program. you can post a sample program to be checked

I'd be inclined to spiral down counterclockwise for a hole, clockwise for a spigot. The only missing data for a G code is tool diameter and start point.

If you program a G code arc which ends at...