[pianotech] shift shim

[tnrwim at aol.com]

I've rebuilt the piano, The old leather on the trap system has been removed and replaced with new leather. The cavity where the shift pedal activates the action is all there, and doesn't look worn out. The action shifts correctly. It's just that when you press the shift pedal, there is about 1/2" of lost motion. I can, and have, added another layer of leather, which reduced the gap, and the shift does move over a little sooner. (It stops at the action shift screw. 

My question was if anyone has ever shimmed the action cavity to take care of the gap, or is adding leather the best solution?

Wim 


 




-----Original Message-----
From: Ed Foote <a440a at aol.com>
To: pianotech <pianotech at ptg.org>
Sent: Sun, Nov 13, 2011 3:09 pm
Subject: Re: [pianotech] shift shim


     I think most shift, (assuming we are talking about the una corda), problems I have seen have been because there is a leather pad that is torn off the trapwork. There is supposed to be a leather pad glued to the screwed on wood inlay that is on the shift lever.    Otherwise, there is something that is holding the action too far to the right, creating a large gap between the top of the shift lever and keyframe.  
    And then there is the gap caused by the keyframe having been eroded and crushed where the shift lever contacts it.  I have always inlaid a piece of end grain ebony when rebuilding a keyframe and it has this problem.  



Ed Foote RPT
http://www.piano-tuners.org/edfoote/index.html



 



The shift on my S&S has about a 1/2" - 5/8" gap. Should I shim the action frame or add leather to the shift lever at the pedal rod?
 
WIm



 





 




-----Original Message-----
From: Ed Foote <a440a at aol.com>
To: pianotech <pianotech at ptg.org>
Sent: Sun, Nov 13, 2011 3:09 pm
Subject: Re: [pianotech] shift shim


     I think most shift, (assuming we are talking about the una corda), problems I have seen have been because there is a leather pad that is torn off the trapwork. There is supposed to be a leather pad glued to the screwed on wood inlay that is on the shift lever.    Otherwise, there is something that is holding the action too far to the right, creating a large gap between the top of the shift lever and keyframe.  
    And then there is the gap caused by the keyframe having been eroded and crushed where the shift lever contacts it.  I have always inlaid a piece of end grain ebony when rebuilding a keyframe and it has this problem.  



Ed Foote RPT
http://www.piano-tuners.org/edfoote/index.html



 



The shift on my S&S has about a 1/2" - 5/8" gap. Should I shim the action frame or add leather to the shift lever at the pedal rod?
 
WIm



 




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