1. They'll be fine as-turned on the lathe.
2. Any more than about 30-35 thou off and they get too thin in my opinion.
3. What matters most is that the axis of the driveshaft is perpendicular to the surface of the clutch plate. To do this, I made a mandrel with a slight taper that I could press the clutch plate onto and chuck in the lathe, using a center in the tailstock on the other end. This has always worked well for me.
|