"Anthony" wrote in message
...
"John Martin" wrote in news:1129592760.888899.110050
@g43g2000cwa.googlegroups.com:

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



A slight dab or 5 of liquid nitrogen would have brought it right out,
most likely.

I have been wondering how well a product called "dust off" would work. It's
made for cleaning out computer cases. Any way one time I turned the can
upside down and sprayed a little in my hand. Not a bright thing to do. I had
a spot of frost for about 15 seconds. I thought man you could freeze a
bushing and drop it in with this stuff. I haven't tried it yet, but about a
15 seconds spraying on the tang end of a number 3 morse taper and I had
frost. Any one out there try that yet?