Darryl Keil Last Activity 2025-09-09 11:09 AM
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Eddie Pacheco; Sa...

 
Subject : rotary vacuum coupler
Posted : 2002-01-25 4:24 PM
Post #29651
: This is about using a vacuum pump for clamping instead of veneering. : I need a rotary coupler to attach my vacuum hose to the outboard end : of the spindle in the headstock of my wood lathe. The inboard end of : the spindle gets a vacuum chuck mounted on it.: The ones in the wood turning catalogs are about a hundred bucks : (ouch). Anyone know of a good one for a reasonable price?You can make a simple vaccum connection to your lathe with this setup. Purchase a length of hollow threaded stock from the electrical supply section of your hardware store. These are used for lamps and come in various lengths.A 12" length of this material may work for you. The stuff is easy to cut.Next purchase the male and female ends of an airhose quick-coupling. The maleend will have to have a female NPT thread.Affix the male end of the quick-connect to the threaded lamp rod using expoxyor by brazing. The other end of the threaded lamp rod goes through your headstockand is secured to the center of a plywood faceplate. Affix closed cell foam to the faceplate forminga ring about a 1/2" less in diameter smaller than the faceplate. The female coupling connects to a hose to your vacuum source and the the 3 ballbearings in thecoupling provide the the means for this part to be secured and the male part to spin within it.This setup is similar to one sold by one of the lathe tool and accessories suppliers.You wil also need a vac. resevoir to provide a buffer for seal leakage. Another thing that will helpis a very small bleed valve to prevent the collapse of thin walled turnings.




 
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Martin Gottlieb

 
Subject : rotary vacuum coupler
Posted : 2002-01-25 5:01 PM
Post #29652 - In reply to #29651
: : This is about using a vacuum pump for clamping instead of veneering. : : I need a rotary coupler to attach my vacuum hose to the outboard end : : of the spindle in the headstock of my wood lathe. The inboard end of : : the spindle gets a vacuum chuck mounted on it.: : The ones in the wood turning catalogs are about a hundred bucks : : (ouch). Anyone know of a good one for a reasonable price?: You can make a simple vaccum connection to your lathe with this setup. : Purchase a length of hollow threaded stock from the electrical supply section : of your hardware store. These are used for lamps and come in various lengths.: A 12" length of this material may work for you. The stuff is easy to cut.: Next purchase the male and female ends of an airhose quick-coupling. The male: end will have to have a female NPT thread.: Affix the male end of the quick-connect to the threaded lamp rod using expoxy: or by brazing. The other end of the threaded lamp rod goes through your headstock: and is secured to the center of a plywood faceplate. Affix closed cell foam to the faceplate forming: a ring about a 1/2" less in diameter smaller than the faceplate. : The female coupling connects to a hose to your vacuum source and the the 3 ballbearings in the: coupling provide the the means for this part to be secured and the male part to spin within it.: This setup is similar to one sold by one of the lathe tool and accessories suppliers.: You wil also need a vac. resevoir to provide a buffer for seal leakage. Another thing that will help: is a very small bleed valve to prevent the collapse of thin walled turnings. Thanks, but will the 3 ball bearings in the coupler last?
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