Unglued grand jack tender

[Farrell]

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CA swells wood? There is a rotational shear stress between the two =
pieces of wood in this joint. That will always be there unless you run a =
couple dowels (tiny) through there or some-such. No, I think you'll find =
that the CA will "carry the load" - as well as it can. On a relative =
scale, CA does not perform at its best when the joint is subjected to =
shear stresses.

However, I have also used CA a number of times for years on this repair =
without a failure ......... that I am aware of.   ;-)

Terry Farrell

----- Original Message -----=20
  From: Dean May=20
  To: Pianotech=20
  Sent: Wednesday, November 10, 2004 7:50 AM
  Subject: RE: Unglued grand jack tender


  Joe,

  =20

  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.=20

  =20

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

  =20

  Dean

  Dean May             cell 812.239.3359

  PianoRebuilders.com   812.235.5272

  Terre Haute IN  47802

  =20

  -----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

  =20

  Cy asked: " why are those =3D
  jacks made in two pieces to begin with?  Is it just so they can fail =
in =3D
  a repairable way if regulation is off (too much aftertouch)?"

  =20

  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,

  =20

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

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