Unglued grand jack tender

[Dean May]

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Conduct your own test. Mic the end of a hammer shank, put a few drops of CA
glue on the end and mic again after it sets up.


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: Wednesday, November 10, 2004 8:33 AM
To: Pianotech
Subject: Re: Unglued grand jack tender

CA swells wood? There is a rotational shear stress between the two pieces of
wood in this joint. That will always be there unless you run a couple dowels
(tiny) through there or some-such. No, I think you'll find that the CA will
"carry the load" - as well as it can. On a relative scale, CA does not
perform at its best when the joint is subjected to shear stresses.

However, I have also used CA a number of times for years on this repair
without a failure ......... that I am aware of.   ;-)

Terry Farrell

----- Original Message -----
From: Dean May <mailto:deanmay@pianorebuilders.com>
To: Pianotech <mailto:pianotech@ptg.org>
Sent: Wednesday, November 10, 2004 7:50 AM
Subject: RE: Unglued grand jack tender

Joe,

Do you have personal experience with these jacks failing after being CA’d?
Remember the CA is not carrying the stress, the joint is. The CA has swollen
the wood and set. It seems to me that this enables the wood joint to carry
the load as it should. It is not the bonding power of CA that we are using
here.

My personal experience is not one failure from jacks glued 6 years ago.

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 Joe Garrett
Sent: Tuesday, November 09, 2004 8:54 PM
To: pianotech
Subject: Re: Unglued grand jack tender

Cy asked: " why are those =
jacks made in two pieces to begin with?  Is it just so they can fail in =
a repairable way if regulation is off (too much aftertouch)?"

Cy,
Being the maker of obsolete action parts, I can say the Jack is the most
difficult item to make. (just close your eyes and try to imagine how that
configuration is cut!) It's made that way, because it's better, IMO
BTW, I hope you are prepared to replace those jacks, as in fairly soon, as
CA doesn't last very well in Stress applications. Please don't do that
anymore. I don't care if it is in some PTG manual.....it's a bad way to
repair something like that! Especially in a high end piano! Yikes!
<G>
Best Regards,

Joe Garrett, R.P.T.
Captain, Tool Police
Squares R I

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