CA and Bridge Pins

[Jim Logan]

Not coming in at the start of this thread I'm a bit puzzled at the terms 
CA glue and ' thin like water'.
For the benfit of a dumb Aussie! Would CA stand for contact 
adhesive?
If it does, how do you thin it down to ' water thinness' ? Other than 
heating it that is. I always thought an epoxy resin was the standard 
bridge pin fixer!
Cheers

Jim Logan - Piano Tuner/Technician



From:           	Kurt Matthies <kwgm@MESAINTERACTIVE.COM>
To:             	"'pianotech@ptg.org'" <pianotech@ptg.org>
Subject:        	RE: CA and Bridge Pins
Date sent:      	Thu, 19 Oct 2000 10:55:45 -0600
Send reply to:  	pianotech@ptg.org

Susan,

This is exactly what happens. The CA glue becomes solid, like cement, and
holds the pin. You basically fill up the crack with the stuff, let it cure
for a few minutes, and it does the trick. On the grand, gravity was a
helper. If you could somehow tilt the upright so the bridge were horizontal,
it would really help.

--kwgm
Kurt W.G. Matthies

-----Original Message-----
From: Susan Kline [mailto:sckline@home.com]
Sent: Thursday, October 19, 2000 9:41 AM
To: pianotech@ptg.org
Subject: Re: CA and Bridge Pins


At 11:10 AM 10/19/2000 -0400, you wrote:
>In a message dated 10/18/2000 11:20:19 PM Pacific Daylight Time,
>sckline@home.com writes:
>
> > Wiping off
> >  the area after a few seconds, maybe breathing on it or rubbing it with
> >  a little white glue to set it up,
>
>Greetings Susan,
>As clever as the white glue discovery is for tacking two things together,
>that's not the intent here. The CA is being used as a filler, and the ideal
>situation would be for it to fill the bridge pin holes level with the
bridge,
>replacing only the space around the pin. Any additional
goop/sticky/compound
>would seem to be superfluous at best.
>Cheers,
>Bob Davis


Hi, Bob

Actually, I've been looking at the results of mixing the two glues, but I
need to do more. If there is plenty of space, and plenty of both glues, it
turns to a sort of hard froth. I haven't checked over time to see if it
hardens further in a day or more.

If the CA has wicked into the holes, it shouldn't end up being goopy, but
should turn to a pretty hard material. The question is whether a thin
smear of white glue to quicken its set time would end up gummy. Maybe
not ... or possibly, it might be easy to remove later. I doubt that the
white glue would penetrate the CA past the surface of the bridge, but who
knows?

I think I have a hunk of bridge off an old, long-dead piano. If I can find
it, I'll try experimenting with it, and see what I get.

Regards,

Susan


Jim Logan