Wow SD you are going way back here, as most new cnc lathes have that built into something like a "tool data" page. G41 is TNRC left side of the tool, and G42 is right side, if I remember correctly. If you simply program point to point and your tool has a nose radius of .031", and you need your angle to be 45 degrees, it won't be. Thats where your G42 is programmed to compensate for the tools radius. Lets say you're taking a cut at X 1.000 then need to drop to .75 at a 45 degree angle, thats where the G41 is programmed. If you're handy at Trig, you can trig the Starting points X and Z and the final points X and Z. As far as what follows the G41 or G42 I can't recall, seems to me it was followed by several letters Like R or Q. Sorry its been so long I can't remember. I'm sure different controls are probably not the same as far as the letters go. I hope this helped.
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