Scott T.: "How about incorrect plate or bridge position or some shift of some kind causing the speaking length to be too long?" I think that's pretty much right...the "Bonus Points" are hanging in the balance (I suppose I should've offered more than 20, considering the price of gas, but I tend to be kind of cheap that way). Everyone who guessed excessive length was right -- that was the fundamental problem, insofar as I can see. *something* was shifting as I brought the strings to tension, causing them to go flat; when I tried to continue raising it to pitch, they predictably broke -- right at the weakest link, the coil (which was the obvious clue that it wasn't from a hangup elsewhere, but rather from an overall excessive tension problem). JeffO ----- Original Message ----- From: "Scott E Thile" <scott.thile@murraystate.edu> To: "'College and University Technicians'" <caut@ptg.org> Sent: Wednesday, October 05, 2005 7:11 AM Subject: RE: [CAUT] Case of the mysteriously breaking treble strings > How about incorrect plate or bridge position or some shift of some kind > causing the speaking length to be too long? > >> -----Original Message----- >> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On >> Behalf Of Conrad Hoffsommer >> Sent: Wednesday, October 05, 2005 7:24 AM >> To: College and University Technicians >> Subject: RE: [CAUT] Case of the mysteriously breaking treble strings >> >> JeffO, >> >> You didn't say _where_ they broke, did you? >> >> Were the pins driven so far that the string rode up and over >> the lowest coil and broke at that point? >> >> >> >> >-----Original Message----- >> >From: Jeff Olson [mailto:jlolson@cal.net] >> >Sent: 04 October 2005 22:44 >> >To: College and University Technicians >> >Subject: [CAUT] Case of the mysteriously breaking treble strings >> > >> >Speaking of UFOs, I was having trouble identifying the cause for a >> >stubbornly breaking treble string in the high treble of an >> older upright. >> > >> >It began with one string that broke twice. The first time, >> I assumed I'd >> >nicked it or something installation. The second time, I >> wondered if it was >> >hanging up on something. But I'd cleaned and polished the >> pressure bar, and >> >I didn't spot anything abrasive on the bridge or harp. >> > >> >Then, as I started chipping the piano to pitch, several more >> strings broke >> >in the high treble (#13). I decided to measure the wire, >> though it was >> >coming fresh out of a new packet (Roslau), and was surprised that the >> >labeled 13 was actually 13 1/2. That seemed odd, but not >> likely to explain >> >the breakage. In any case, I switched to 13 -- actually >> micced it this >> >time -- and the strings still broke. >> > >> >Then, finally, I figured it out. Any ideas about what the >> "mystery cause" >> >was? >> > >> >Best, >> > >> >JeffO >> > >> >> >> >> Conrad Hoffsommer >> I tried to get a life once, but they were all out of stock. >> >> _______________________________________________ >> caut list info: https://www.moypiano.com/resources/#archives >> > > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives > >
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