Front Rail Keypin Alignment Reality Check

[Scott Nelson]

Hi Terry, 
   
  When you turn the key pin left or right, you are effectively decreasing the space in the mortise. It's similar to when the damper wire, instead of travelling vertically, is being pushed through the guide rail bushing at an angle. This often results in a sticking damper if there is not much clearance between the wire and bushing.
   
  The best way to do this would be to shift the position of the keypin laterally, rather than bend it at an angle; it is also impractical under most circumstances. So, you may have to ease the key a little more instead. 
   
  Incidentally, if you turn the pin left or right and have sufficient clearance, it can be observed that the key will travel to the left or right as it goes down, so your spacing of course needs to be done with the stack on. I say this because I did it with the keys at full dip (stack off) and 
found out later that the spacing at rest position was less than ideal.

  regards, 
   
  Scott Nelson, RPT
  Steve Brady's concert piano technician book had some stuff on side pressure that pianists can feel. Important to teflon powder the bushing cloth...

David Ilvedson, RPT
Pacifica, CA 94044

----- Original message ----------------------------------------
From: A440A at aol.com
To: pianotech at ptg.org
Received: 6/24/2008 1:51:44 PM
Subject: Re: Front Rail Keypin Alignment Reality Check



><< I'm doing this on a keyboard with nice new key bushings. When the pin is 
>aligned with the mortise slot, there is near zero friction. But when you bent 
>the pin to move the key over, friction picks up real quickly.


>So what's going on here >>

>Greetings, 
> It sounds to me like the too long a piece of bushing cloth is in the 
>mortise. 
>Regards, 

>Ed Foote RPT 
>http://www.uk-piano.org/edfoote/index.html
>www.uk-piano.org/edfoote/well_tempered_piano.html
> 


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