Capstans

[Farrell]

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
> > > >
> > >
> > >
>
>