Virtual Capstan

[Isaac OLEG]

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But this is not the intention to lighten the parts, only to add a secondary
capstan. What I suspect is that the usual DW/UW measurements are not saying
enough in that case.

These new magnets look amazing, I did some tests with strong magnets a few
years ago, and indeed the repelling or attracting force they have can be way
more than any of us suspect actually.


Isaac OLEG

Entretien et reparation de pianos.

PianoTech
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94400 VITRY sur SEINE
FRANCE
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  -----Message d'origine-----
  De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de David M. Porritt
  Envoye : dimanche 22 juin 2003 19:15
  A : pianotech@ptg.org
  Objet : Re: Virtual Capstan


  Bob:

  Isn't this like the man who wouldn't set his suitcase down because the
elevator already had a lot of weight on it?

  dave
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  On 6/21/2003 at 11:54 PM BobDavis88@aol.com wrote:
    Imagine holding a 10-lb. sack of sugar. You feel it as ten pounds. Now
attach a powerful magnet to the bottom of the sack, and a powerful repelling
magnet in your hand. The magnets might not touch, but is the sugar lighter?
No. It might even float a few inches in the air, but you still feel ten
pounds of weight in your hand, the same as if it were sitting on top of a
coil spring which you were holding.

    This is because the magnets are part of the lever system. In order to
actually remove weight from the system, they have to be external to it. This
is true as well of springs. Wippen assist springs are external to the
system. Their  force acts against the support flange, and in turn upon the
[theoretically rigid] wippen mount rail. 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.

    I think Richard should re-do his measurements.

    Bob D
  **************** END MESSAGE FROM BobDavis88@aol.com *********************
_____________________________
David M. Porritt
dporritt@mail.smu.edu
Meadows School of the Arts
Southern Methodist University
Dallas, TX 75275
_____________________________

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