[pianotech] action ratio

[Joseph Garrett]

And they mean what?! I'll need something a bit stronger, like a good single malt!"Key in"??? What does that refer to? Just because some brainiac thunk that up, doesn' mean squat unless an explanation is with it imo.<G>
Joe


----- Original Message ----- 
From: Dale Erwin 
To: joegarrett at earthlink.net;pianotech at ptg.org
Sent: 8/25/2012 8:18:25 AM 
Subject: Re: [pianotech] action ratio


These are formulas used by Nick Gravagne , David Stanwood and others to determine the overall action ratio. Which is a very useful thing to know. 
 Need some Excedrin now Joe?


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: Joseph Garrett <joegarrett at earthlink.net>
To: pianotech <pianotech at ptg.org>
Sent: Sat, Aug 25, 2012 8:03 am
Subject: Re: [pianotech] action ratio


David said: "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? "

David,
First of all, I need to know what the hell "key out...." and "key in..."
means. Have never heard the terms. I suspect if I knew, I'd get a headache
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I
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