Turning

Subject:
Re: Vac pump questions
Response To:
Vac pump questions ()

John K Jordan
One place to look is Joe Woodworker's vacuum chucking page:
https://www.joewoodworker.com/veneering/vacuumchucking.htm
This is meant for the person building his own vacuum chucking system from components, basically everything except the pump. (He sells the bearings, fittings, etc. at pretty good prices.)

He talks a little about vacuum pump requirements. The vacuum pressure needed depends on the area of the chuck, the weight of the piece, the speed turned, the porosity of the wood, any leaks in the system. He shows the simple math to calculate the force but doesn't make specific recommendations, only this:

"I can only suggest one thing... the bigger, the better. Several of our customers are using 3 CFM vacuum sources for chucking but most are opting for 5 CFM` vacuum sources."

A more powerful pump is not a problem as long as you put a bleeder valve to reduce the force if needed. A vacuum gauge can help.

I've heard that people are happy with vacuum chucking systems from here:https://www.frugalvacuumchuck.com/
He sells reconditioned pumps with complete systems or kits. The prices don't look bad to me.

JKJ

© 1998 - 2017 by Ellis Walentine. All rights reserved.
No parts of this web site may be reproduced in any form or by
any means without the written permission of the publisher.

WOODCENTRAL, P.O. BOX 493, SPRINGTOWN, PA 18081