Piano wire tensile strength

[Carl Meyer]

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  ----- Original Message -----=20
  From: PAULREVENKOJONES@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Saturday, June 25, 2005 8:22 PM
  Subject: Re: Piano wire tensile strength


  In a message dated 6/25/2005 8:48:50 PM Central Standard Time, =
cmpiano@comcast.net writes:


    It's elementary, my dear Watson.  Twisting the wire work hardens it =
and=20
    therefore it is stronger.  Anyway, that's as good as any for a =
reason.



  Carl:
  Twisting (unless it were to be 20 or 30 times perhaps) doesn't even =
approach "work-hardening" or the duplex deformation properties of metal =
which is bent past a point in the curve of elasiticity. So....not as =
good a reason as any. :-)

  Paul R-J=20


  Paul,  I was just being funny, but if 30 turns approaches "work =
hardening" then with 3 you're ten percent on the way.

  BTW, I had a 7 ft Hardman that I put on new strings.  The bass strings =
I'd put on (made by brand X) were not good.  I'd decided to have them =
made over by brand ? but when I  tried twisting them 3 full turns they =
shaped up nicely. =20

  One comment about twisting strings that dawned on me.  Judge the =
number of turns (if you want to do it) by the length of the string.  =
Obviously a long string  can tolerate more twists.  Like we need a spec =
on number of twists per foot.

  Carl Meyer PTG assoc
  Santa Clara, Ca.
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