Capstan angle

David Love davidlovepianos@comcast.net
Mon, 18 Apr 2005 16:54:06 -0700


After conducting my own experiment with a straight up capstan and an
elongated and leaning one, I stand corrected.  Interesting though.  I
recall having been corrected on this same point some years ago by
someone but in the other direction.  Oh well.  Hard to argue with a
rocket scientist.  Like my father says.  I've never been wrong, except
once, when I thought I was wrong, but it turns out I was right.  

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Mark Davidson
Sent: Monday, April 18, 2005 4:31 PM
To: Pianotech
Subject: Capstan angle



Phillip Ford wrote:
 >>    Well, it's two against one, so you guys must be right.

Make that two against two.  :)  As Phil has noted, the force on the key 
by the capstan must somehow take into account the sideways force on the 
capstan when the capstan is leaning.  The net effect after doing all the

math is that the distance to the contact point is effectively what
matters.

-Mark
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