[CAUT] Lever Arm Ratio

[Dale Erwin]

Hi Bob
  Measuring the key ratio. Folks do this 2 ways.  You pick
 ie Measure from the key front to the balance hole. say 10 inches
 then measure from the balance hole to the top of the capstan or just straight back from the balance hole to a line directly under the intersecting contact point of the capstan. The distances will be different
The ratio will come out slightly different so try it both ways and see which way you prefer.
Dale
 


Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
 Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397

 
  





-----Original Message-----
From: Bob Hull <hullfam5 at yahoo.com>
To: caut <caut at ptg.org>
Sent: Thu, Aug 9, 2012 7:03 pm
Subject: [CAUT] Lever Arm Ratio



Hi All!  In measuring a key for the ratio between front lever arm and rear lever arm,  I am measuring from the front of the key and the back end of the key to the capstan.  However, if the capstan is angled (1927 Steinway M) then, does the measurement need to account for the offset created by the angled capstan.  In other words, is the length of the lever determined by the point on the top of the key at the capstan point of contact with the key or the distance from the key end to the contact point with the wippen heel?


I am taking these measurements to give to WN&G for the building of a new top action stack.  


Thanks,


Bob Hull

 
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