Re: Ballscrew machining, FAQ

In a message dated 02/26/2000 2:35:59 PM Hawaiian Standard Time,
stratton@... writes:

<< Problem is the screw is .508" in diameter, too small for a 5/8"
collet. Given that it's a screw, I don't see any easy way to indicate
it in in a four jaw chuck, and my three jaw is ready for the scrap
heap. Looks like it's time to place an order for a 39/64" collet,
which would be .609375". What is the gripping range of a 5c collet
anyway? I'd try tape and the 5/8", but not sure how accurate the
results would be. >>

Chris,
I took a 1.5" long length of 1" dia cold rolled steel and bored it out to
the correct diameter. Then I slit it length wise so it can be clamped. Insert
the ballscrew, grip the assembly in the 1" 5c collet in your spindle and turn
away.

Peter
THRD, Inc.