Breaking Point

[Farrell]

Well, I guess that makes sense. I measured pitch with my Accutuner at the time (use a Veritner now) - I presume I was pretty accurate with pitch measurement. The strings on this piano were in "reasonable" shape - the piano did have some corrosion issues, but the strings were not "highly" corroded. I have to admit that I was a little bit surprised that they would go so sharp before breaking - but they were pretty darn consistent.

Terry Farrell
  ----- Original Message ----- 
  From: paulrevenkojones at aol.com 
  To: pianotech at ptg.org 
  Sent: Thursday, September 25, 2008 11:11 AM
  Subject: Breaking Point


  Terry:

  Interesting that you were able to measure so "accurately" on average. The typical breakage of plain wire is in the range of 300 cents above it's scaled pitch, or a minor third. You just proved it to yourself. We've done some research projects here at the school with a beautiful jig built by one of our students to prove that point as well. 

  Paul

    Most broke when pulled 200 - 300 cents sharp!






  -----Original Message-----
  From: Farrell <mfarrel2 at tampabay.rr.com>
  To: Pianotech List <pianotech at ptg.org>
  Sent: Thu, 25 Sep 2008 4:51 am
  Subject: Re: Old Ivers and Pond to pitch raise or not to...


  Like others have said, pull it up to pitch and get on with it. Chances are strings will not break. One time when stripping down a 100+ yo Everett grand I experimented with the strings to see how high I could pull the strings before breaking. Most broke when pulled 200 - 300 cents sharp!




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