Unglued grand jack tender

[Marcel Carey]

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When I find a broken jack tender, I find it's an important thing to look for
excessive after touch. Remember if there is too much after touch, it's
possible to bind the jacks and cause failure.

Marcel Carey, RPT
Sherbrooke, Qc
  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf Of Dean May
  Sent: November 10, 2004 7:51 AM
  To: Pianotech
  Subject: RE: Unglued grand jack tender


  Joe,



  Do you have personal experience with these jacks failing after being CA’d?
Remember the CA is not carrying the stress, the joint is. The CA has swollen
the wood and set. It seems to me that this enables the wood joint to carry
the load as it should. It is not the bonding power of CA that we are using
here.



  My personal experience is not one failure from jacks glued 6 years ago.



  Dean

  Dean May             cell 812.239.3359

  PianoRebuilders.com   812.235.5272

  Terre Haute IN  47802



  -----Original Message-----
  From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
Behalf Of Joe Garrett
  Sent: Tuesday, November 09, 2004 8:54 PM
  To: pianotech
  Subject: Re: Unglued grand jack tender



  Cy asked: " why are those =
  jacks made in two pieces to begin with?  Is it just so they can fail in =
  a repairable way if regulation is off (too much aftertouch)?"



  Cy,

  Being the maker of obsolete action parts, I can say the Jack is the most
difficult item to make. (just close your eyes and try to imagine how that
configuration is cut!) It's made that way, because it's better, IMO

  BTW, I hope you are prepared to replace those jacks, as in fairly soon, as
CA doesn't last very well in Stress applications. Please don't do that
anymore. I don't care if it is in some PTG manual.....it's a bad way to
repair something like that! Especially in a high end piano! Yikes!

  <G>

  Best Regards,



  Joe Garrett, R.P.T.
  Captain, Tool Police
  Squares R I

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