On 1/21/2014 11:50 AM, Zane Omohundro via Piano Technicians Guild wrote:
>
> I spent over an hour reading through previous Pianotech discussions
> that mentioned the procedure,
You have most of what you need then, and some contradictory stuff. The
very first thing you do is pull that action and verify that the block
isn't delaminating and falling apart. CA will only work if it has some
physical structure as a matrix to work with.
> 2) How many drops am I aiming to apply with the glue? A few?
Some. Apply until you can see it backing up. That'll indicate you have
saturated the wood contacting the pin, which is what you want.
> 3) Does it matter where I place the glue relative to the tuning pin
> (north, south, etc?)? Should I try to place drops all around the
> circumstance of the pin?
I put it where the gap is, at the front of the pin so it will be sure to
go in around the pin. It will self distribute from there. The front of
the pin, incidentally, is toward the front of the piano where the
keyboard is.
> 4) Should I wear a respirator during the process?
You should.
>How long does the
> odor remain?
Until it's gone, ascertainable by pulling the respirator down a bit and
sniffing.
Best to do this when it's warm enough to open the
> windows and blow air past the piano for a few days?
Not necessary. It will be over in a half hour.
> 5) Should I wear tight-fitting gloves during the process?
Your call, depending how you feel about getting CA on your hands.
>If yes, what kind? Nitrile? Latex?
Either. Even those "sandwich bag" plastic food handlers' gloves will
work, though they're pretty clumsy.
> 6) The main issues with the piano are in the bass section and through
> the midrange. Should I treat only those sections? Or do the whole
> piano at once?
I do it all. Shooting for the minimal fix has too much callback
potential, and I don't carry CA as part of my kit.
> 7) Better to remove action and put paper down on the keybed to catch
> drips? Or slide paper on top of the action?
Absolutely - remove the action. Murphy was a blithering optimist.
> 8) How long should I wait for the glue to dry before trying a tuning?
I do the worst part first. By the time I've finished the rest of the
piano, the first part will hold tension. Even if I go over the worst
part a second time, I might, at most, have to kill ten minutes or so for
it to firm up enough to tune.
Caveat: I've CA'd maybe four pianos, so this isn't from experience with
thousands
Ron N
Original Message------
Hi List,
I believe I have found a good candidate for a CA glue pinblock treatment on a 1930s Baldwin baby grand. The client wants to get a few more years out of it before moving and will likely leave the piano behind. I have not personally performed this procedure, so I've been trying to gather more information before tackling it.
I spent over an hour reading through previous Pianotech discussions that mentioned the procedure, I've read through the procedure in Mario Igrec's book, and I've spoken with a few technicians about it, but I'm still left with a number of questions. I appreciate any information you can give me.
1) Are there any good Journal articles on this topic or other written resources?
2) How many drops am I aiming to apply with the glue? A few?
3) Does it matter where I place the glue relative to the tuning pin (north, south, etc?)? Should I try to place drops all around the circumstance of the pin?
4) Should I wear a respirator during the process? How long does the odor remain? Best to do this when it's warm enough to open the windows and blow air past the piano for a few days?
5) Should I wear tight-fitting gloves during the process? If yes, what kind? Nitrile? Latex?
6) The main issues with the piano are in the bass section and through the midrange. Should I treat only those sections? Or do the whole piano at once?
7) Better to remove action and put paper down on the keybed to catch drips? Or slide paper on top of the action?
8) How long should I wait for the glue to dry before trying a tuning? A week?
I apologize for the endless questions. I really want more information before jumping into this procedure.
Thank you,
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Zane Omohundro, RPT
Columbia MO
www.zanepiano.com
zanepiano@gmail.com
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