"DoN. Nichols" wrote in message
...
On 2008-01-26, Bob Engelhardt wrote:
I'm putting a new motor on my lathe that has a bigger shaft than the old
pulley. I'm planning on boring out the old pulley (another 1/8"), but
I want to make sure that this is not a Bad Idea before I do. Is it OK?

Well -- the first question is what will you use to do the
boring? I would want to do it on a lathe, taking the time to truly
center it in a 4-jaw chuck. (And I might use an old belt to fill the
outer V-groove so the chuck jaws are less likely to damage the pulley.

Soft jaws were made for a job like this. They support the pulley
adequately, and automatically align it in both planes. Best of all, they
won't mar the pulley, which will be delicate due to the narrow edges of the
groove.

Harold