"Dick" wrote in message
...
snip-----

I've got a couple of
carbide drill bushings that need to be ground down to .642 od from .675 od
to use as sanding mandrills.
Any help would be greatly appreciated,
Dick

I failed to address this issue.
The only real success you'll achieve with grinding carbide is with a diamond
wheel. Beyond that, one of the green silicon carbide wheels may do the
job, but not nearly as well as diamond. I'm not sure you can buy them is
sizes for small grinders. Never seen them in all my years in the shop.

You're not in a good position in this matter. Grinding that much off
almost demands running coolant----which is not a good idea on a lathe when
grinding. You might be far better off to either buy a bushing the right
size, or pay to have them ground. The potential for damaging your machine
(by running coolant when grinding) is very real in this instance.

Considering they're for sanding, you might achieve good success by making
the right size bushing from drill rod and torch hardening. No grinding
necessary. Just a thought.

Harold