The plate broke; you did not break it. Period. Please see the plate issue of the Journal for more information: http://www.ptg.org/ptj/plate_issue.pdf Kent Swafford On Oct 5, 2007, at 4:05 PM, Robert Payne wrote: > Greetings to all, > I am a 30 year veteran of our craft but a newbie to the tech list. > I need your help. I have seen broken plates that were already > broken when I got there, but for the first time one broke during a > tuning, ( following a large pitch raise ). The piano was a 20+ year > old Currier Studio that appeared to be in near perfect condition. > The customer said that it hadn't been tuned since it was new. It > was around 150 cents flat (maybe as much as 200 in spots). First I > pulled it to 440 with no overpull. After that it was about 50 to 60 > cents low. Next I did a normal pitch raise using the appropriate > overpull. After fixing a few strays I was ready to tune. Just as I > was setting the A4 to 440 I heard this tremendous > BAMMMMMMMMMMMMMMMMMM ! ! ! I ABOUT HAD A HEART ATTACK. The entire > middle section went completely dead.Of course broken plate was the > first thing that came to mind, but what I found was really strange > to me. The plate appeared to be laminated steel. I have never seen > or heard of such a thing. One of the laminates had separated and > was pushing out on the strings. What can anyone tell me about these > laminated plates ? Was this catastrophe entirely my fault or was > there a way to avoid this ? Is it possible or feasible to attempt a > repair ? For future reference, what other manufacturers have used > this kind of plate ? > The customer was extremely gracious and insisted that it wasn't my > fault, but I can't help but feel responsible for not recognizing > the potential danger in attempting such a large pitch raise on this > particular instrument. ( I have successfully raised pitch by that > much many many times during my career.) Anyway, thanks for your > input. I'm looking forward to the verdict. > > Robert Payne, Rpt. Dallas Chapter -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20071005/09d21d33/attachment.html
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