Virtual Capstan

[Mark Davidson]

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Picture capstan exactly under center of gravity of wippen.  The weight =
supported by the wippen center
is zero.  If you move the capstan closer to balance rail, some of the =
weight is shifted to the wippen center.
Also more of the support from the key is shifted from the key front to =
the balance rail.  The wippen=20
center and balance rail are both "grounded".  So maybe there's no =
contradiction.


-Mark

  ----- Original Message -----=20
  From: BobDavis88@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Sunday, June 22, 2003 1:44 AM
  Subject: Re: Virtual Capstan


  In a message dated 6/21/2003 8:56:08 PM Pacific Standard Time, =
BobDavis88@aol.com writes:


    In order for a pair of magnets to store potential energy in the =
deformation of the magnetic field, one of them must be mounted outside =
the moving part of the system; i. e., on the action frame.



  Well, slight correction, I mean energy storage that makes the action =
lighter. A multiple capstan, solid or virtual, just distributes the =
point(s) of application of the force - it doesn't lessen the input force =
required to move the wippen. The changing gap of the magnet just changes =
the distribution of the load between the two capstans.
  Bob 
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