View Full Version : First Longworth chuck. need to make one more
02-05-2008, 1:06 AM
Well I got inspired and made me one. It operates wonderfully but it did not perform. So here is the dilemma and the question.
I used 3/4" ply 15 1/2 in diameter for both discs and everything worked out great aside form the ply warping ever so slightly. Needless to say it renders the chuck worthless since it wobbles about 1/16". I figured, that must be the reason so I'm ready for round 2.
What is the preferred material to make it? I figure MDF but I like to know what your opinions are. Would you use 3/4 for both discs? I don't know where I could get MDF thinner than 3/4. Would lowes or HD sell less than a 4x8 piece of MDF?
Thanks for the info.
02-05-2008, 7:34 AM
The HD's around here have 1/2" MDF.
02-05-2008, 8:31 AM
MDF is available in different thicknesses. Its common material at most large cabinet shops. Try one near you, they probably have scraps.
02-05-2008, 8:44 AM
I used birch ply to make a donut chuck and I was surprised on how much I had to face it before it would run true. I have heard mixed advice about using mdf for chucks but I know it has been done by many people. You can get it at the big box stores in 3/4, 1/2, and 1/4 in 2'x4' sheets as well as the normal 4'x8'.
If you do go by the cabinet shop looking for scraps see if they have any Corian scraps while you're there.
02-05-2008, 8:58 AM
Most HDs and Lowes I go to have cut 2'x4' panels but not always every thickness, but you might ask for them to cut up what you want.
I see 1/2" often, and you could use 1/4 tempered hardboard for the front.
I use 3/8" and 1/4" baltic birch and it works fine. It's very stiff when tightened down.
One of the things that may make it wobble is the mounting method. A hair at the headstock center is magnified at the circumference. Use screws and shim even if you think it's flat and square.
02-05-2008, 9:40 AM
I made mine out of 3/8" MDF and it is holding up well. It is very stable and after about 6 mounths of use still hasn't given me any trouble.
02-05-2008, 11:05 AM
Mine is made from 3/4" MDF for the back plate and 1/2" for the front. Works slick.
02-05-2008, 12:21 PM
Thanks for the info. I took it appart again last night and check the warp. It is only on one of the plates (the one that drives) before I make one more I'll try to pass the one I have throught the drum sander and see what happens, or just scrape the face of the disc. I think trueing the one I have sould be faster.
I'll post once I done.
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