This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment David, Ivory curling as you described sounds like a clamping problem to me. = If one wets ivory with water, or glues containing water it will curl if = not quickly clamped properly. Clamping a head back on a keystick should = have a means to clamp the head down flat and to push the head back to = mate with the tail. The proper glue to use, in my opinion, depends on = the setting in which the repair is made. Other factors such as = tradition, opinion, what is the latest-and-greatest, and cost come into = play. I'm not a road warrior, so all of my key restoration is done in = the shop under controlled conditions. My initial approach to gluing on = keytops was to go back to the basics. What am I gluing, wood, ivory, = bone or plastic? What am I gluing it to? What kind of joint am I making, = edge, face or end? What are the clamping and surface preparations = needed. Each of these scenarios will have different requirements. Gluing = a keytop on to a keystick is face-gluing, gluing on a front is = end-gluing, and gluing on to, or building up the sides of keysticks is = edge-gluing. Choose your glues wisely, the glues that one would use on = the road may not have the best properties or be the best to use in a = controlled environment. While most glues or adhesives natural or = synthetic will "glue" most things together, there are favorable and = unfavorable qualities to each. Mike ----- Original Message -----=20 From: David Ilvedson=20 To: pianotech@ptg.org=20 Sent: Thursday, April 14, 2005 11:06 AM Subject: RE: Gluing Ivory w/PVC-E...was Contact Cement, yada yada "starved joint" possible on plastic applications also, I suppose? =20 David I. -------------------------------------------------------------------------= ----- Original message From: Joe Garrett=20 To: pianotech=20 Received: Wed, 13 Apr 2005 23:39:09 -0700 Subject: Gluing Ivory w/PVC-E...was Contact Cement, yada yada David Vanderhoofven asked: "Could you enlighten me as to the details = involved in gluing ivory pieces on=20 with PVC-E glue? I had a bad experience recently with ivory and=20 PVC-E. The ivory curled up very badly. I am assuming that the = moisture in=20 the glue caused the ivory to warp. How do you keep the ivory from = warping=20 when using PVC-E glue? Thanks!" David, First, I do not thin the stuff. As a matter of fact, I let it get = thicker.<G> I add titanium dioxide to the stuff until it's really = thick.<G> I use special clamping plates made out of 1/4" thick aluminum. = The brass ones, sold by our illustrious suppliers, suck! I use those in = the field, but have mixed success. BTW, only LIGHT clamping pressure is = needed. Too much pressure will definately cause a "starved joint". 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/28/3d/55/7b/attachment.htm ---------------------- multipart/alternative attachment--
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