new Longworth chuck

[Wally Wenzel]

Jerry, I made one of those a few years ago, and just a couple of weeks ago i made another. I turned the buttons for mine on my pen mandrel so i could shape them the way i wanted with more taper so as to grip better, then i diped them along with the head of the bolt in what is called plasti dip it is what they dip plier handles and the like in to give a cushion effect, i diped them 3 or 4 times to get a really good coating. It works as good as can be and is as fool proof as you can get. I use it all the time. I made mine out of 3/4 and 1/4 ply.
Wally

[Bill Stevener]

Just another good link, which may also be helpful.

http://www.woodcentral.com/cgi-bin/r...cles_485.shtml

Check the other link I posted in this thread, look on pg. 2.

[Bruce Shiverdecker]

Thanks Bill. I missed that it consisted of TWO pieces.

Bruce

[Paul Heely]

Not to be crabby, but, How do you keep the feet aliged so that the piece is centered? Looks like they act independently, not in unison like a scroll chuck does.

Bruce

I would assume you could also help center it the same was as when using a a friction chuck. Use the tail stock and the center point on the foot of the piece that was left from earlier turning to center and hold the piece against the chuck until the feet are tightened.

[joe greiner]

Very well done, Jerry.

Some suggestions from my experience:
1. Cut some half-holes on the perimeter of the back disk. A Forstner bit works fine for half-holes. This enables rotating the front disk with one hand while holding the bowl with the other. (pic 1 - bowl absent)

2. Add a fender washer at the back disk to help the bolt stay perpendicular to the surfaces of the disks. Also, a snug retainer on the end of the bolt can avoid losing the wing nut when (not if) it gets too loose. A slot cut in the end of the bolt facilitates tightening the bolt for expansion mode, i.e. for an undercut rim. (pic 2 - washer was DIY HDPE; the retainer was micro-surgery on a wire nut.)

3. When tightening the bolts, work diametrically as for tightening lug nuts on a car wheel, vs. working around the circle. This helps to maintain a concentric condition on the compressed buttons.

4. A couple wraps of duct tape across the bowl to the back of the back disk is good insurance against a free-flying satellite. BTDT. Most finishes won't be harmed by brief contact with the tape adhesive.

Joe

[Jerry Allen]

Good tips, Joe and Wally

[DONNIE CRUMP]

i would like the pdf as well good job by the way

[John Keeton]

Donnie, this thread is four years old, and I doubt you will get a response. The .pdf file is posted in the thread and downloadable if you are a contributor. It probably is not viewable by you with a member status.

[Louis Prugh]

Jerry,
I would like the cdr file please.
Lou Prugh