Re: [CAD_CAM_EDM_DRO] Machinig Ball Screws

The grinding wheel on a good grinder is mounted on a separate collet
which has a tapered internal bore and a left hand spanner nut to hold
the wheel on. On toolroom size surface grinders the wheel bore is inch
and a quarter. In order to get good finish, and to prevent damage to
the spindle bearings the wheel is weighted so that there is no heavy
spot on the wheel. Good wheel collets have a set of movable weights so
when the wheel is dressed, and mounted on a axle, it can roll between
parallels and stop in a random position, if the wheel has a heavy spot
it always ends up down. Norton makes some kind of adhesive gunk you can
put on the wheel to balance it, but the best way of wheel poising is
with the adjustable collet. An unbalanced wheel makes a wavy pattern in
the ground surface. Sopko in Cleveland makes these balancing wheel
collets for all known grinders.

This said, I've never heard of a balanced wheel on a toolpost grinder.
You typically need a really rigid set up and really good spindle
bearings, neither of which is found on a toolpost grinder, before
balancing makes a difference.

David M. Munro

currinh@... wrote:

>David:
>
>Thanks for the note. I do have a concern about spreading abrasive over
>my lathe. My thought is, if I do this infrequently and are carefull,
>then.....
>
>What is a "poised wheel"?
>
>I had not thought of lapping. This could be an easy solution for a few
>parts. I might try this first and see how difficult it is.
>
>Thanks. :-)
>
>Hugh Currin
>Klamath Falls, OR
>