[CAUT] treating existing bridges in restringing

[Ed Sutton]

Tom-

Bill Spurlock published an article on epoxy treatment of bridges before restringing (PTJournal ca 1995).  I think Ron Nossaman's approach of drilling deeper and driving the pins to height is a good improvement.  Renotching and repinning with epoxy seems to give a clearer sounding instrument, and also seems to be less sensitive to humidity.  It's a standard procedure in my little shop.

Pianos being the complex and expensive gadgets that they are, we don't get many chances to make controlled comparisons.
You are in the interesting position of rebuilding two M's at the same time.  Surely there is some special comparison you can make!

Ed Sutton

  ----- Original Message ----- 
  From: Thomas Russell 
  To: caut at ptg.org 
  Sent: Tuesday, June 12, 2007 2:26 PM
  Subject: [PHISH] Re: [CAUT] treating existing bridges in restringing


    Greetings,



  I would be interested in reading about what you do to treat bridges with CA or epoxy when restringing.  I have a pair of Steinway Ms that I will be working on this summer.


  Tom Russell
  Iowa State University



      I've been using epoxy in original bridge caps for 30 years, and CA on occasion for over 10. It certainly improves tone quality and minimizes false beating, and does seem to narrow pitch swings with seasonal changes. I've done testing with bridge models of various types, and epoxy or CA saturation of at least the cap does improve dimensional stability with humidity shifts.


      Ron N
    Hi Ron,

    When you say epoxy or CA saturation, what do you mean in terms of method used to saturate? Are these methods one could use on an existing bridge in a piano?


    Regards,
    Fred Sturm
    University of New Mexico
    fssturm at unm.edu









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