Hi Guys,
I will try and correct a few points about tool compensation in turning.
1. Compensation on a lathe is in no way the same as milling.
2. Tool comp on the lathe has no effect on the diameter of the work.
Lathe tools have a nose radius, this can be set to 1 of 8 tip directions in the tool offset table along with the actual radius of the tool tip.
A standard finish turning tool is set to 3 an internal tool is set to 2.
Radius comp is there to compensate for the error between the programmed change point and the actual contact point of the tool. This sound odd I know but without it angles and rads are the wrong shape and size.
Now the crunch.
I have never got Mach to work properly, I think there are major issues with comp in lathe, I need to talk to Brian and Art about this while Lathe is getting some attention.
Graham.