split bridge

[Joseph Garrett]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment
David,=20
If you are using an epoxy that is made specifically for ''gluing", =
actually bonding is the better term, wood together, then it is ok to =
clamp. I have seen failures were generic type epoxy was used and then =
clamped. Every one failed. As for the solvents to clean up the epoxy. It =
has been my experience that it is not adviseable. I personally have had =
failures due to cleanup, before the epoxy is set. If'n you don't believe =
me, ask a chemist, etc.
I've been doing epoxy repair on bridges for over 20years. The examples I =
cited above were my failures. So take it or leave it. <grin>
Joe
  ----- Original Message -----=20
  From: David Love=20
  To: pianotech@ptg.org=20
  Sent: Friday, August 31, 2001 7:51 PM
  Subject: Re: split bridge


  Joe:
  =20
  Why would you not clamp epoxy?  The bridge needs to be pulled back =
together, among other reasons, to get the pins back in the right =
position.  My conversation this date with Roger Weisensteiner confirmed =
my belief that this would be the method of choice for making this =
repair.  He suggested using a two part epoxy (e.g. West System type) and =
clamp it back together reinserting the pins either before or after it =
dried.  My concern with after is that if I have to redrill the case =
might be in the way.  So I will probably reinsert the pins before it =
dries.
  =20
  Regarding solvents and epoxy, I have, in the past, repinned bridges =
putting a drop or two of epoxy in the bottom of the bridge pin hole =
prior to inserting the pin.  The squeeze out I have cleaned up by =
brushing it onto the notch using an acid brush with a bit of lacquer =
thinner.   I think I may have been introduced to this technique by Bill =
Spurlock in a Journal article in fact.  Though I recognize the =
controversy surrounding epoxying bridge pins in, I wasn't aware that a =
bit of lacquer thinner was compromising the strength of the epoxy. =20
  =20
  David Love
    ----- Original Message -----=20
    From: Joseph Garrett=20
    To: pianotech@ptg.org=20
    Sent: August 31, 2001 5:47 PM
    Subject: Re: split bridge


    David,
    It is not adviseable to "clamp" epoxy. Use a gap filling type and =
just let it set to almost, then clean up by scraping, etc. Also not =
adviseable to use the compatible solvent, of which there are two, (there =
may be more), Alcohol and lacquer thinner are verboten, it will simply =
break down the strenght of the epoxy. I personally use "steel epoxy" for =
this kind of repair.
    regards,
    Joe Garrett
      ----- Original Message -----=20
      From: David Love=20
      To: Pianotech=20
      Sent: Friday, August 31, 2001 10:07 AM
      Subject: split bridge


      I have a customer with a Boesendorfer 225 c 1978.  The bridge is =
splitting along the speaking side pin line on the top 5-6 notes.  I'm =
not sure how long it has been this way, this is the first time I've seen =
the piano.  My intention is to remove strings from this area, work epoxy =
into the crack, pull it all back together with clamps and clean off the =
excess with a bit of lacquer thinner.  Any comments.
      =20
      David Love

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20/62/85/08/attachment.htm

---------------------- multipart/alternative attachment--