[pianotech] action ratio

[Dale Erwin]

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: Fenton Murray <FMurray at cruzio.com>
Sent: Fri, Aug 24, 2012 9:29 pm
Subject: RE: [pianotech] action ratio



Very interesting.
I think the answere to Dave’s question is “ it’s equal to let off”
 



 
  

 

-----Original Message-----
From: David Love <davidlovepianos at comcast.net>
To: pianotech <pianotech at ptg.org>
Sent: Fri, Aug 24, 2012 8:03 pm
Subject: [pianotech] action ratio


One formula for the action ratio has been given as:

 

Key out  x wippen out  x shank out  =  blow distance – let off

Key in      wippen in    shank in       key dip – after touch

 

 

Does anyone happen to know what the standard (or minimum) aftertouch is in this formula or how it was derived? 

 

 

Thanks

 

 

David Love

www.davidlovepianos.com

 

 



 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20120825/f24f55f0/attachment.htm>