Capstans

[Delwin D Fandrich]

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>From the information given, I'd guess an oversized pilot hole.=20

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.=20

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.=20

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


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  ----- Original Message -----=20
  From: Dave Nereson=20
  To: pianotech@ptg.org=20
  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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