Roller Bearings link ? ( was Bad Bearing ( was Re: stuck stepper

Because of the odd shapes of the pieces I was using I had been boring
my bearing seats with a boring head in my mill. My biggest problems
with tight tolerances really have been tool deflection and the fact
that I don't have guage blocks or even a real internal micrometer.

I finally went out and bought a proper sized reamer to get the hole
size exactly right. This cut down on the number of "rigged" bearing
seats I had to tolerate.

Thanks for the advice. I'll keep my eye out for an internal knurling
tool. I don't know that I really need one, but it sounds kind of
neat.

-Erik Reikes

>
> They can be found. I'm not sure in long run it's much better.

Nobody puts

> bearings into knurled seats. They shoot for the right fit. I wind up
> fitting stuff to these tolerances every week. Working to tenths-

thou isn't

> easy but it's possible even with older equipment, and it's quite
> satisfying. One method is to set compound angle to arcsin .1, then

each

> thou grad is .0001" on radius. Or you can set it to arcsin .05 and

work

> directly to dia.
>
> Regards, Hoyt McKagen
>