[CAUT] Re: swelling knuckles -- old thread

[michelle stranges]

Heyyy.. that's a VERy interesting post.

:o

michelle

--On Thursday, May 5, 2005 9:32 AM -0400 "Joseph D. Gotta, RPT" 
<tune@a440piano.com> wrote:

> Was there a significant reduction in friction? If so did you find the
> repetition springs suddenly a little too strong? I have encountered this
> and had to relax the springs to alleviate double striking hammers on a
> closely regulated action. This was with powdered Teflon applied to the
> knuckles though so I'm sure there was no swelling involved.
>
> Joseph D. Gotta RPT
>
>
> -----Original Message-----
> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
> Otto Keyes
> Sent: Wednesday, May 04, 2005 4:14 PM
> To: College and University Technicians
> Subject: [CAUT] Re: swelling knuckles -- old thread
>
> Some time back I mentioned encountering a problem with bobbling hammers
> on a
> D after I had hit them with a shot of dry spray teflon, but then forgot
> to
> report the results.
>
>> From some of your suggestions I was afraid I was going to have to
> re-pin
> everything (fairly new parts), but the pinning turned out to be just
> fine.
> Though I don't know how much they changed, since I didn't measure just
> before the treatment, the let-off was consistently closer, so the
> knuckles
> had swelled just slightly.  This, coupled with the fact that the
> regulating
> button felt on the jack had compressed slightly, allowing it to sit just
> a
> bit deep under the knuckle, caused the hammers to double-strike.  Once
> those
> 2 elements were dealt with, it settled down to work like a real piano
> again.
> My guess is that something in the aerosol carrier in the teflon spray
> caused
> the knuckles to swell just enough to cause problems when put together
> with
> other minor deficeincies.  I doubt that it would have caused a problem
> had I
> just sprayed it on the balancier & top of the jack.
>
> Otto
>
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