Ratio question

[Dan Reed]

It would have an effect on action mechanics..but Phils question is to 
define a relationship or formula  between changing key height, and the 
resultant key dip.

Dan

On May 11, 2008, at 12:34 PM, David Ilvedson wrote:

> But if the key is raised the capstan will move back slightly and that 
> would have some effect on action mechanics...?
>
> David Ilvedson, RPT
> Pacifica, CA  94044
>
> ----- Original message ----------------------------------------
> From: "Jon Page" <jonpage at comcast.net>
> To: pianotech at ptg.org
> Received: 5/11/2008 9:44:36 AM
> Subject: Ratio question
>
>
>>> Is there a ratio that can be looked upon as a standard with
>>> the following scenario:
>>> If you increase the key height by ... , you will increase
>>> dip by ... .  Something tells me it's not a 1:1 ratio.
>
>> Where'd you get that something?...
>
>> If you raise the key height 1mm, the dip will increase the same 
>> amount; 1:1.
>
>> The only ratio aspect which is different and non-applicable is that
>> the key height increases a smaller percentage than the dip:
>> 62 mm key height increased to 63 mm is a .016% increase
>> 10 mm dip increased to 11 mm is a 10% increase.
>> But has no bearing on anything.
>> -- 
>
>> Regards,
>
>> Jon Page
>