Thanks for the info John. And OOPS! I confused your name with John..........somebodyorother who does rebuilding from NY! Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: "John Hartman" <pianocraft@sprintmail.com> To: <pianotech@ptg.org> Sent: Tuesday, January 09, 2001 12:40 PM Subject: Re: Capstans > Terry, > > You will find the series of articles about capstan replacement in the first > three installments of "Piano Shop Trade Secrets". They appeared in the December > 99, February 00 and the March 00 issues of the Journal. If you don't have these > you can contact the home office to buy back issues. > > I was at the Arlington Convention to work at the Renner booth. I was not there > to present any of my classes. > > John Hartman RPT > > Farrell wrote: > > > 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 > > > > > > > > > > > >
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