[pianotech] Re. Glue for hammers

Joseph Garrett joegarrett at earthlink.net
Mon Jun 8 09:01:36 MDT 2009


Paul McCloud said: "Having flexibility in the glue joint is going to affect the system,
either a little or a lot. Which one I would guess would depend upon the
degree of flexibility. If it doesn't matter that there's flexibility in
the glue joint, then why do loose hammers emit a different tone? Ok,
that's an extreme case, but is it not a matter of degree? In that case,
the hammers are still disconnected from the jack and continue forward from
momentum. Let's hang some hammers with different glues, different amounts
of clearance in the joint, shanks that are/are not knurled, and see what is
the result. I would guess that there will be some slight difference. For
the sake of this thread, a direct comparison would be very informative.
My take."

Paul et al,
Yes it is "very informative" AND enlightening. I've done the experiment, as you suggest, but not with the Titebond M&H glue, (it wasn't around then). I used PVC-E; TiteBond & Hide Glue. I first voiced the hammers so that they were very even. Then, I removed 2 hammers and reglued with the "Other glue". Let set up for 48 hours and then listened to the difference. This was done on a piano with new hammers/Shanks and flanges, in my shop. The difference was VERY discernable and definate. It proved what I suspected. End of story. If any of you wish to do the same experiment, please do. To debunk is somewhat disrespectful, IMO. <G>
Thanks for listening
I'm out of here for another hiatis
JOe



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