capstan spacing

[Isaac OLEG]

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Ask some design oriented guys more experienced than me, but seem to me that
the goal in placing capstan and pins is to align them on a straight line
(front pin, balance pin / capstan) while this ideal situation is not always
possible indeed.

Checvk the position of the mis centered capstans in that regard, may be they
are not so much off then ?

Interesting subject, those hand drilled instruments are not really accurate
for parts alignemnent in my opinion.

Isaac OLEG


-----Message d'origine-----
De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de Allen
Wright
Envoyé : jeudi 5 août 2004 03:28
À : College and University Technicians
Objet : Re: capstan spacing


Wim and Vince,

My question would be, what happens to the spacing of the rep to the hammer
shank/knuckle after these acrobatics you mention?

I certainly shim the whip flange in order to space the lever to the hammer
flange, but I prefer to keep the top of the rep lever as horizontal as much
as possible, and not tilt the lever off of 90 degrees if I can help it.

But what I'm really getting at is this: I notice quite a few of the capstans
I've removed were slightly off center of the keys anyway, and not always in
the right direction (making the capstan spacing noticeably off). It just
seems to make sense to me to take advantage of the opportunity (while
drilling new capstan holes) to see where the whip heels are when all the
action parts are properly spaced to the strings (particularly in the bass
and tenor, where the strings can't be moved) and drill capstans off center
purposely in the right direction.

Probably even just some form of eyeballing the relationship of the whip
heels to the keys could be used to mark where to drill the capstan holes. I
wondered though if anyone has thought about this and perhaps come up with a
real accurate way to do it.

I also wonder if there is any reason why slightly off-center capstans could
be a bad idea, in terms of geometry or wear. Perhaps more wear on one side
of the keybushings? I imagine that would be subtle if noticeable at all.

Any comments will be appreciated.

Cheers,

Allen Wright
Northern Kentucky University
On Wednesday, August 4, 2004, at 03:28 PM, Wimblees@aol.com wrote:


  In a message dated 8/4/04 11:15:10 AM Central Daylight Time,
awright440@cinci.rr.com writes:

  I
  noticed before removing the capstans that quite a few of them aren't
  centered perfectly to the whip heels, some being quite noticeably off
  to one side or the other. The rep levers are spaced to the hammer
  shanks accurately (with the hammers spaced to the strings).


  Alan

  You can try to center the cushions over the capstans by tilting the wips.
You might need to paper the flange to do that, just like you paper one
corner of a hammer flange to move the hammer to the right or lift. (not the
same as traveling).

  The other way to center the capstan under the wippen is to move the front
of the key. I just did this on an older D. There were quite a few capstans
that were not center under the wippen cushions. So after I tilted the wips
as much as I could, I moved the front of the key slightly, and moving some
of the keys around them to make sure the keys were still evenly spaced.
Also, make sure the keys are level. That can also effect the centering of
the capstan.

  Wim
  Willem Blees, RPT
  Piano tuner/technician
  School of Music
  University of Alabama

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