[pianotech] hammer return noise

[Gene Nelson]

        I would begin by replacing the hammershank on one note, with a dummy hammer or whatever, and see if the noise is in the knuckle or elsewhere. If changing hammer shank doesn't fix it, then go on to the whippen,etc.  
      I find that having the rep lever height set so the jack and knuckle are well acquainted with one another, will often quieten the return noise.  See if it is quieter with a significant "wink" in place.  
  Good luck, 
  Ed Foote RPT

  I believe that replacing the hammershank will be my focus today. Initially I had set the rep lever height to minimum required for jack return. The noise is noticable at this adjustment and I had raised the levers slightly thinking that they may provide a cushioned return for the knuckle. It did not help so the rep levers are back to minimal height.
  Gene
















  Key frame is properly bedded.
  Action is regulated.
  All action frame joints and screws are solid and tight.
  All action parts screws are tight.
  All centers are at optimal friction with no wobble.
  All hammer glue joints are solid.
  All whippen glue joints are solid.
  Hammer rest rail has new felt, is adjusted at correct height and nuts are tight.
  Key stop rail has new felt and is adjusted for minimal up key movement.
  I have checked the knuckles - the core is firm dense felt and a needle easily goes in from the side. Buckskin is not too tight over cores.
  I have had minimal to zero results using my sugar coater on the knuckle buck skin.
  I can depress the key about 2mm, release it and give a slightly woody clunk upon return. 
  Noise is a bit louder when hammer falls after releasing from check.
  Happens on the bench and when secured in the action cavity.
  It is noticeable when playing especially in the upper treble section with lid closed but the noise exists in the lower parts as well but not quite so noticeable when playing.

  Any ideas would be helpful.
  At some point I should just give up and accept it as normal action noise? 
  Thanks for your thoughts.
  Gene

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