bobble heads

[Isaac OLEG]

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Hello,

Possibly because of the new knuckle position the jack is not clearing it or
is locked in the little cushion in the lever window.

Bad action stack may be , check by lifting one side of the keyboard and see
if the action warps a lot or if the drop screws are not aligned.

Warped action stack and  bad frame bedding could well add to the thing

Hammer tail too short, backchecks angle , and so on .... too much dip
Isaac OLEG

  -----Message d'origine-----
  De : caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]De la part de
Wimblees@aol.com
  Envoye : mercredi 16 octobre 2002 00:47
  A : Pianotech@PTG.org; caut@ptg.org
  Objet : bobble heads


  Problem: Bobbling hammers on a S&S M from C5 on down. I mean, they don't
even check on a hard blow.  Some of them are checking, but only on a hard
blow. The rest just bobble. New hammers, shanks and flanges.

  Let off is right, drop is right, there is after touch. I changed let off,
I changed drop.  Keys are level, right amount of dip.  I increased dip,
decreased dip. I've increased rep spring, and decreased rep spring. Dampers
are not in the way. Nothing.

  This is a 1939 model. There has been some discussion about knuckle size.
As I said, these are relatively, (about 3 years old) new h/s/f/ , with 3/8"
knuckles. Could that have an effect?

  Wim

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