[pianotech] action ratio

[Mike Spalding]

Dale,

Why would he need excedrin?  He said the headache would only come once 
he was told the definition of the terms in the equation.  All YOU've 
provided is the names of people who use them.

Mike

On 8/25/2012 10:18 AM, Dale Erwin wrote:
> 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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