[pianotech] Blocking Problem

[Roger Gable]

Blocking ProblemFloyd,
Check the placement of the let-off rail. If too close (forward) toward the fulcrum of the jack, this anomaly can occur. If this is a low cost (cheap) vertical with a thin let-off rail, it could be bending enough on a heavy blow to delay the let-off. Also, try lubricating the butt leather.
Roger Gable
  ----- Original Message ----- 
  From: Floyd Gadd 
  To: pianotech at ptg.org 
  Sent: Sunday, September 19, 2010 3:19 PM
  Subject: [pianotech] Blocking Problem


  List,

  I was adjusting the let-off in the bass of a vertical piano on Friday.  With a slow depression of the key, let-off could be measured at 1/8".  With a firm blow, the hammer blocked solidly against the string, with no interference from the backcheck.  I have only two guesses as to why.  One is that the existing depression on the regulating button is leading to inconsistent interaction with the toe of the jack.  The other is that the profile of the hammer butt buckskin has been compromised by wear, leading to this issue.  

  What other possibilities am I missing?

  Floyd Gadd
  Manitoba Chapter
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