wippen support springs

[Roger Jolly]

---------------------- multipart/alternative attachment

Hi Jack,
                  Samick is using them in the Renner action/  Knabe line of 
pianos,  3 different thickness of spring across the key 
board.  .7mm,  .6mm,  .5mm.   You will hear passionate arguments for and 
against.  The keyboard should be weighted off at 67gms tapered to 60gms at 
the end of the spring section, with the springs disconnected.   Springs are 
the connected, and touch weight adjusted from 54gms in bass to 48gms 
extreme treble.
I will be going to Korea next week to set up new touch weight parameters.

I like the lowering of mass. and the increase in up weight, from the use of 
springs.   Springs should not support any more than 15gms of down weight in 
the bass and 8-10 gms in the treble.

As for making weighting more difficult.    I feel you can get very even 
weighting, and use a pre mapped or CNC weight off pattern, the springs are 
simple to adjust once you get the hang of it.

Springs have been used in the past to hide a multitude of sins at the 
factory level.   Fudging geometry and friction problems.    When used 
correctly, I love them.

Regards Roger
Technical Consultant
Samick Music Corp.


At 09:36 PM 4/27/2005, you wrote:
>I would like to know some things about wippen support springs. Who uses 
>them?  Do companies still continue to use them?  Should they be 
>removed?  I know they make key weighting difficult.
>
>Jack Houweling
>
>

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/82/31/92/ac/attachment.htm

---------------------- multipart/alternative attachment--