CA in a hurry

[Dean May]

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I admit that I haven’t done careful scientific studies. All I have is my
experience and gut feeling. I also have Joe Goss and others telling me they
have used it for ten years.

Maybe it is the class of pianos I work on. If you are working on high end
pianos with soft blocks that aren’t terribly old, perhaps oversize pins work
more reliably. I have not had good success with them. I have one old upright
in particular that the whole bass section was really flakey. I put in
several oversize, sand paper shimmed others. It did not last more than a
couple of years. On a severely cracked block you are only stressing the
cracks more in that kind of situation.

Then I CA’d it. That was 4 years ago and it is still holding very snug.
Instead of stressing the wood further, CA reinforces the cellular structure,
it strengthens the wood. Of course that is educated conjecture. No lab
testing involved.

I have not yet encountered a piano that CA glue did not work very reliably
on. I have been doing it for about 6 years now and have yet to see one quit
working. So my evidence is admittedly anecdotal. But combine it with Joe
Goss and others and it seems to me it presents a pretty compelling case.

Dean
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On Behalf
Of Farrell
Sent: Tuesday, November 16, 2004 7:48 PM
To: Pianotech
Subject: Re: CA in a hurry

I think CA is generally a good band-aid approach to loose tuning pins. I
agree that CA is easier to do than pin replacement with an oversized pin (or
sandpaper shim), but what evidence do you have that CA is more reliable or
that it lasts longer (greater durability, I assume)? Even though I think
that CA is generally reliable and that it lasts a long time, I would guess
that it is less so than a bigger pin or shimming a pin.

But I have not tested that hypothesis. Perhaps you have?

Terry Farrell
----- Original Message -----
From: Dean May <mailto:deanmay@pianorebuilders.com>
To: Pianotech <mailto:pianotech@ptg.org>
Sent: Tuesday, November 16, 2004 7:21 PM
Subject: RE: CA in a hurry

Andre wrote:
Modern pin blocks can easily take on over size tuning pins and according to
me, an oversize tuning pin is much more reliable.


Methinks that is perhaps because you have little experience with CA gluing a
pin block. Having used both methods I have to testify that the CA method is
more reliable, longer lasting and easier to do.

Dean
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802



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