"Wes" wrote in message
...
For something like a taper for a R-8 or MT 4 1/2 or 5C or MT 3 what kind
of
tolerance in inch per foot is considered reasonable?

Thanks,

Wes


The answer is, tighter than I can measure.

I had one R-8 that tended to stick in the mill. After much head-scratching
(it measured the same as the others) and looking for wear spots (I didn't
really want to get my mill spindle full of Prussian Blue...), I figured
where the problem HAD to be. I chucked the offending R-8 into the lathe,
gave it a spin and hit it with some emery cloth for about two seconds. It
took off enough so that the collet now fit perfectly. And I still couldn't
measure the change.

Jerry