This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment 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 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/98/7e/a3/c7/attachment.htm ---------------------- multipart/alternative attachment--
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