U1 hammer butt problem

[John Formsma]

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Did you check for excess friction in the troublesome flanges?

John Formsma (not my real name)
  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf Of Pianotunaguy@aol.com
  Sent: Thursday, June 03, 2004 7:49 PM
  To: pianotech@ptg.org
  Subject: Re: U1 hammer butt problem



  In a message dated 6/3/04 10:22:37 AM, roger.j@sasktel.net writes:



    Do you have sufficient after touch?  If the hammers
    have been filed, and the back rail has not been corrected, (46mm blow if
my
    memory is correct).  This can be the cause of the problem.  Dip should
be 10mm.
      Key level through the centre section will also give the same problem.
    Are the length of the loops the same as the old loops?  This can
    significantly alter the spring tension.



  Thanks to all for your great suggestions.  Roger, you've given me a few
things to check.  There IS enough after touch, but I wonder if the loops are
the same size.  They were certainly made of a different material, much
thicker in diameter than the old loop.  I did move the hammer rail forward
to the specs in the little blue book by Potter, but I don't recall the
distance.  I also levelled the keys and set the dip all to the specs listed
in that book.

  I just have the gut feeling that this is caused by something that I
changed, and not just wear and tear.  After all, this problem appeared en
masse from the moment I put it all back together.

  PTG (PianoTunaGuy)


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