Gluing Ivory w/PVC-E...was Contact Cement, yada yada

[MICHAEL MORVAN]

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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.






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  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
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