CA Glue

[Alan]

Well, okay. I don't pretend to be an expert but ...

When he said "cracked bridge" I pictured serious splitting——separation of
laminations, or some such. In such a case, I would want epoxy for it's
gap-filling, shear-strength, fiber-filling, and stable bonding
characteristics.

If it's just little eyelash cracks, I'm open to the CA option and have used
it--especially when I don't want to loosen string tension, etc., to do a
proper epoxy job. But I don't really know that it is working, though I'm
sure it helps stabilize pins. For how long, I dunno.

And don't get me wrong, I am a 100 percent convert to tuning pin CA work and
have saved quite a few pianos with it, but I still think of CA as
"superglue" and don't trust it where real solid bonding and shear-strength
are required between porous surfaces, e.g., wood. So when I can clamp
things, its Titebond or Elmer's Carpenter Glue for me. And when clamping is
not possible or gaps are to be filled, e.g., large cracks around bridge
pins, I like epoxy. Thinner is better, the kind that thins and activates
with heat is ideal for bridge work, methinks.

Any actual glue experts, out there? How about owner's/workers from big-time
piano rebuilding shops? What is your counsel and experience?
  
Alan R. Barnard
Salem, MO


-----Original Message-----
From: Chris Henke [mailto:cjhpianotech@comcast.net] 
Sent: Thursday, September 16, 2004 5:22 PM
To: Pianotech
Subject: Re: CA Glue


Alan, would you care to write a few words about why you prefer Epoxy for 
cracked bridges?

Chris Henke
Portland, Oregon

----- Original Message ----- 
From: "Alan" <tune4u@earthlink.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Thursday, September 16, 2004 11:12 AM
Subject: Re: CA Glue


> 1) Cracked bridge? No. Epoxy. But, to stabilize bridge pins—including 
> very minor eyelash cracks on pianos not worth major restoration or 
> repairs? Yes. (Oooh, Mrs. Zinser woulda thrashed me soundly for THAT 
> lousy bit of
> English!)
>
> 2) Unk.
>
> 3) Because the CA repair here is not actually a "gluing" job, but 
> rather a "soaking up filling in the wood fibers then drying hard" kind 
> of job, I am of the belief that this repairs is relatively permanent. 
> Check back with me in 20 years ...
>
> Alan R. Barnard
> Salem, MO
>
>
> These questions should make for some interesting discussion:
>
> 1) who likes to use CA glue instead of Epoxy for cracked bridges, and 
> why?
>
> 2) How long is a cracked bridge repair using CA glue expected to last?
>
> 3) How long is a loose tuning pin repair using CA glue expected to 
> last?
>
> Thanks, Chris Henke
> Portland, Oregon
>
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