What kind of drive? what kind of load? How do you know this is not correct? 601-604 is a VERY SMALL error. You will chase yourself around all day trying to get that to zero and it will make no difference in the end. Kind of like spending all your time trying to eliminate all the backlash in a manual mill. that is a .066666% error on the spindle speed. Not significant.
VFD, 3 phase motor, no load (air cutting)
I put a laser tacho on the spindle and it reads 600.0 to 600.8rpm
So whilst I agree it doesn't seem to make much difference and it is a small amount.... except the threading will not start 50% of the time. This seems to be the G76, G32 or G92 not picking up the index. Presumably because the index is too irratic.
thanks for the reply