Unequal key ratios: puzzler

[David Love]

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I used the Stanwood method.

David Love
  ----- Original Message -----=20
  From: Isaac OLEG SIMANOT=20
  To: pianotech@ptg.org=20
  Sent: February 15, 2002 2:50 PM
  Subject: RE: Unequal key ratios: puzzler


  David,

  How did you mesure the ratio ? By weighting or measure ?

  Thanks.

  Isaac
    -----Message d'origine-----
    De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la =
part de David Love
    Envoy=E9 : vendredi 15 f=E9vrier 2002 16:31
    =C0 : Pianotech
    Objet : Unequal key ratios: puzzler


    Recently rebuilt a S&S model S c 1931.  The measured key ratios for =
the sharps were .48, for the naturals .51.  I considered moving the =
capstans on the sharps so the total leverage on each would be equal.  =
But when I started to set up samples and take measurements, I found that =
the FW pattern was smooth and the corresponding SWR's were equal.  I =
would have expected that sharps to need less FW or, with a smooth line =
front weighting,  a varied SWR.  Somewhere in the system something else =
compensated for the different key ratios.  Question is where?  All new =
parts, strike weights smoothed, BW all equal.  the job is now completed. =
 I left the capstan positions alone and the FW curve was pretty smooth, =
SWR all 5.9 - 6.0.  A few bumps along the road as is often the case, but =
one would have expected 6-10 grams less FW on the sharps.  Any opinions?

    David Love


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