John Martin wrote:
I needed to remove some ball bearings from an old power brush I'm
rebuilding. The outer race was hidden by the shoulder on the plate
it's mounted in, so I couldn't drift it out. I broke out the inner
race and tried grinding a notch in the outer race with a Foredom-type
grinder and a pink stone, which was taking forever.

I had some solid carbide end mills, so I mounted the plate in the mill
and used the mills to cut into the race. Pretty quickly found that,
even though the mill is fairly heavy, I had to lock the table down.
It's not really a great way to do it, though. The mill is a
horizontal, which means I'm working on the backside of the piece. And
I broke two endmills. Finally got through the race, but nicked the
housing a bit.

There must be a better way. Have been considering picking up some
carbide burrs for the grinder. Will these cut through hardened races
quickly? Any better choice of grinding points?

John Martin

IF You can get to the backside of the race where the flange is hiding
the back of the beating, Take an end mill & make 2 holes in the flange
big enough for whatever size punch you use to drive the race out..you
don't need 360° support for that bearing anyhow !!

Failing that, I have blown them out w/ an acetelene torch---the brgs are
High carbon steel & usually blow out w/o nicking the support metal--
it's uasualy low carbon steel & won't get hot enough to burn out while
you're doing the race. Jerry
usually