<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=text/html;charset=iso-8859-1 = http-equiv=Content-Type> <META content='"MSHTML 4.72.3026.0"' name=GENERATOR> </HEAD> <BODY> <DIV> </DIV> <DIV><FONT size=3>Hi List,</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT face="" size=3>String breakage, I never got  all the = answers on this subject so I will ask, why do the strings break at the point where = the wire starts curving around the tuning pin?</FONT></DIV> <DIV><FONT face="" size=3></FONT> </DIV> <DIV><FONT face="" size=3>I have a CF Yamaha in my care that is now = breaking strings in the bass A0, B1 & G1.  All singles. So far. All T = pins are loose.</FONT></DIV> <DIV><FONT face="" size=3></FONT> </DIV> <DIV><FONT face="" size=3>History.  The piano has been stored = in  a 5% humidity environment,  the tuning pins are loose some very loose, = and over the last 5 years the piano is constantly out of tune with pins = slipping.  Constant spasmodic tuning,</FONT></DIV> <DIV><FONT face="" size=3></FONT> </DIV> <DIV><FONT face="" size=3>The owners wants to know what is the cause = of the breaking strings ?  What is the cause ?</FONT></DIV> <DIV><FONT face="" size=3></FONT> </DIV> <DIV><FONT face="" size=3>I have read most of what was said on this = subject but I can't recall if an answer was given.</FONT></DIV> <DIV><FONT face="" size=3></FONT> </DIV> <DIV>Please help me give the right information to the owners.</DIV> <DIV> </DIV> <DIV>To me, I am querying the clues given in this thread and am offering = and asking for assistance in either proving or disproving the following theory.</DIV> <DIV> </DIV> <DIV>Because when piano wire is down down to the required dimension, the = outer part of the wire goes hard while the inner core remains softer.</DIV> <DIV> </DIV> <DIV><FONT color=#000000>1.     Is this process = work hardening the wire in a controlled process and then other excessive = bending causing the outer side hard wire to crack.  ???</FONT></DIV> <DIV><FONT color=#000000></FONT> </DIV> <DIV>2.    Should piano wire because of the hard outer = and soft core be more likened to a metal tube filled with lead.</DIV> <DIV>What would happen if you flex or bend the tube back and forth a few = times, would this cause the metal tube to crack. ?</DIV> <DIV> </DIV> <DIV>I am no engineer or metallurgist but this seems feasible to = me.  BUT what do I tell the owners that caused the strings to break.</DIV> <DIV> </DIV> <DIV> </DIV> <DIV>Regards   Tony Caught  <A href="mailto:caute@accessnt.com.au">caute@accessnt.com.au</A></DIV> <DIV> </DIV> <DIV><FONT face="" size=3></FONT> </DIV></BODY></HTML>