Tightbond Creep

[Farrell]

Thanks for the rehash!

Terry Farrell
  
----- Original Message ----- 
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Sunday, April 27, 2003 2:11 PM
Subject: Re: Tightbond Creep


> 
> >Is this just urban legend or what? What I am especially concerned about is 
> >laminated ribs, rib-to-panel, and bridge-to-panel joints with Tightbond. I 
> >know its been stated that creep is not a problem, but I was rather 
> >suprised to see the above on a website that otherwise seems to provide 
> >pretty darn good information.
> >
> >Terry Farrell
> 
> And you'll hear it again and again forever from everyone on the planet who 
> uses hide glue, resorcinol, plastic resin, epoxy, urea formaldehyde, 
> Gorilla Glue, or anything else that's not an aliphatic resin (because 
> someone told them it creeps). What you won't hear - at least I never have 
> that I recall in spite of having asked around a number of times through the 
> years and searched the Web for creep rate information - is anyone who 
> reports actual instances where Titebond or any other yellow carpenter's 
> glue has shown this to be the case. Everyone seems to "know" this, but no 
> one seems to have seen it first hand. If you ever do find documented creep 
> rates for a Titebond glue joint observed under real world livable 
> conditions, I'd sure like to know about it. Anyone have creep and 
> compression set rate figures on spruce under the stress conditions it's 
> placed under in a piano soundboard - compression crowned or rib crowned? 
> Laminated ribs? It wouldn't surprise me a bit to discover that the creep 
> rate of spruce is considerably higher than that of Titebond, which leaves 
> us where if that's the case? I've been using Titebond for bridge and 
> soundboard work for over 25 years, and don't know of a glue joint failure. 
> Maybe they just don't tell me when the ribs fall off.
> 
> I rank it at about the level of concern of sound not going through 
> horizontal laminations in bridge caps and roots, plate bushings killing 
> tone, tuning duplexes increasing sustain 300%, and which side of the 
> mountain your soundboard lumber came from.
> 
> But that's me. Your mileage may vary.
> 
> Ron N
> 
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