[pianotech] Re. Glue for hammers

[David Ilvedson]

Well, Ron has lots of free time... '-]

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Joseph Garrett" <joegarrett at earthlink.net>
To: pianotech at ptg.org
Received: 6/8/2009 8:01:36 AM
Subject: [pianotech] Re. Glue for hammers


>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