True, but not the point I was making which was only that there is the theoretical minor 3rd above pitch where tension breakage points reach toward 100%. Generally, it's not even close to that when the string breaks due to other mechanical issues such as friction and bearing angles. P In a message dated 3/2/2010 2:28:25 P.M. Central Standard Time, deanmay at pianorebuilders.com writes: It’s surprising because usually when a string breaks during tuning it isn’ t approaching anything close to 300 cents sharp. Other factors are at work, but our ear is not hearing 300 cents sharp. Dean Dean W May (812) 235-5272 PianoRebuilders.com (888) DEAN-MAY Terre Haute IN 47802 ____________________________________ From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Tuesday, March 02, 2010 2:42 PM To: pianotech at ptg.org Subject: Re: [pianotech] String Breakage Why? Way-average breaking percentage of 70% at pitch yields another three half steps of pitch (300 cents) rise to approach 100%. Paul In a message dated 3/2/2010 12:37:19 P.M. Central Standard Time, mfarrel2 at tampabay.rr.com writes: I had a 1900 Everett grand with the original strings in my shop a few years ago for restringing and just for the yahoo of it my son and I decided to see just how far above pitch you could pull a string before it broke. We did maybe a dozen or so and pretty regularly we would pull them about 300 cents sharp before they broke. That surprised me a bit. Terry Farrell -----Original Message----- From: Mike Kurta <_mkurta1 at comcast.net_ (mailto:mkurta1 at comcast.net) > To: _toddpianoworks at att.net_ (mailto:toddpianoworks at att.net) ; _pianotech at ptg.org_ (mailto:pianotech at ptg.org) Sent: Tue, Mar 2, 2010 7:57 am Subject: Re: [pianotech] String Breakage SNIP We had a chapter meeting once where we took a junk piano and everyone took a turn at purposely trying to break the strings. We each brought our tuning wrench and took turns cranking tighter and tighter until the strings broke. It was amazing! Most pins turned 1/2 a turn or more before the string let go. Again, there is no rhyme or reason...... Mike Kurta, RPT Chicago chapter = -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100302/21d37fd3/attachment.htm>
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