Hi Tony, I think that I see what you are trying to say. Question, would one get a straight string if the core wire were not straightened? And does the string that is made on a straightened core wire hang to the left in the northern hemisphere and to the right down under? All kidding aside is there a real difference that one can notice? Joe Goss imatunr@srvinet.com www.mothergoosetools.com ----- Original Message ----- From: "Tony Caught" <caute@optusnet.com.au> To: <pianotech@ptg.org> Sent: Friday, May 24, 2002 8:35 AM Subject: Re: Bass string winding Tension > Hi Newton, > > 60% of the strings tension when it is up to full tension in the piano. > > We all know that the string will stretch as we increase the tension on the > string, by as much as 10 millimetre or more. Whilst this is happening the > copper windings theoretically should be parting by a '.' amount. Now if the > string when tuned has 80 kilo of tension and has stretched 10mm then : > > If the string was wound at 40 kilo tension with a stretch of 5mm then the > '.' gap would be wider than if the string was wound at 48 kilo (60%) with a > stretch of perhaps 3mm. > > I would think that a string wound at a higher tension would require less > twist than the string wound at the lower tension. > > But there must be a point where if you have too much tension (say 80 kilo) > that the copper wire would be crushed when the tension is released and the > string shrinks. > > Possibly the right tension is that one that causes the string to not hang > straight. ? > > Hope you understand what I am trying to say. > > Regards > > Tony > > > > > You are getting into some of the arcane aspects of string making. > > > > First, some string winders "straighten" the wire as it comes off the > coils. > > Some do not, thinking that curve is important to the quality of their > strings. > > The copper, which is not all the springy, will not impart much of a twist > to the > > string when hanging loose. > > > > 60% of what? Your question, as stated, is not clear. You do not want to > exceed > > 65% of the breaking point of that size of wire. This does not happen > often but > > it can on big pianos and on the tiny ones with real heavy wraps. > > > > Newton > > > Tony Caught > Darwin > Australia > caute@optusnet.com.au > > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.361 / Virus Database: 199 - Release Date: 08/05/02 >
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