Hi John. I think you have addressed my main question regarding pressing capstans into a key - how do you grip the capstan and drive it straight? - you indicated that you use a "'chuck' out of 1/2" canvas reinforced phonelic rod (MSC #75963412571)." What is MSC #75963412571 (is the MSC a company?)? Can you provide any additional technical description of the characteristics of your machined taper (angle, depth, method, etc.)? P.S. Enjoyed your belly class @ Arlington. Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: "John Hartman" <pianocraft@sprintmail.com> To: <pianotech@ptg.org> Sent: Monday, January 08, 2001 7:51 PM Subject: Re: Capstans > Del, > > In the March 2000 issue of the Piano Technicians Journal there is an > article I wrote about using the drill press to instal capstans. The > tapered "chuck" grabs the capstan with enough friction and is easily > made on a wood lathe. I have made a change in my procedure and have made > a new "chuck" out of 1/2" canvas reinforced phonelic rod (MSC > #75963412571). The same tapered hole is machined into the bottom. I got > this Idea from Ted Sambel and have used it successfully for reinstalling > capstans in old key as well as for new keyboards. > > Give it a try, it works great. > > John Hartman > > Delwin D Fandrich wrote: > > > From the information given, I'd guess an oversized pilot hole. Let me > > make a distinction here, as well. It is possible that a factory might > > successfully turn the capstans in place. This would be done with a > > machine that would precisely grip the head of the capstan holding it > > nice an true and then spin the capstan down with no side play on the > > capstan at all. This is not how we would do the operation in our > > shops. We take a capstan wrench -- of whatever type -- and slowly > > crank the thing down. They wobble all over the place finding their way > > down as best they can. By pressing, rather than turning, the capstan > > into a properly sized pilot hole, it is driven straight into the hole > > without much damage to the sides of the hole. I've tried it both ways > > and have consistently found those capstans I have pressed home to be > > straighter and tighter than those I have turned in. However, your > > mileage may vary.... If it works better for you to turn them home, > > then that it the proper way for you. We'll keep pressing on. Del > > ----------------------------------------------------------------------- > > > > ----- Original Message ----- > > From: Dave Nereson > > To: pianotech@ptg.org > > Sent: January 07, 2001 11:37 PM > > Subject: Re: Capstans > > I recently tried to regulate a brand-new Boston studio. > > The capstans wouldn't stay regulated. I'd regulate them, > > then after tuning, there'd be too much lost motion again. > > The capstans were being pushed down into their holes even on > > a medium-hard blow, and no, I wasn't pounding the heck out > > of it. The factory must've a) drilled the holes too large, > > or b) pressed, rather than turned them into their holes. Or > > maybe the holes expanded due to the dry Colorado climate > > ? --Dave Nereson, Denver > > > >
This PTG archive page provided courtesy of Moy Piano Service, LLC