Re: Torque Meter Question

From: <RLBailey_at_care4free.net>
Date: Tue, 16 Oct 2007 09:52:42 +0100

If you find that the torque reading does not return to zero when the torque is removed, you have definitely overstressed the torque wire beyond the elastic limit and the wire has a permanent set.

Bob

  ----- Original Message -----
  From: John Barker
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Monday, October 15, 2007 10:27 PM
  Subject: RE: [Indoor_Construction] Torque Meter Question


  Cal
  If my memory is not playing tricks after all these years then the equation
  you require is:

  Stress = modulus of rigidity x angle of twist x radius of wire / length of
  wire.

  modulus is usually about 11.5 x 10^6 lb/sq.in
  angle of twist = 2 turns = 4pi radians
  radius of wire = 0.0075 in.
  length of wire = 125 mm = 4.92 in.

  I make that to be a stress of near 220,000 lb/sq.in = 98 tons/sq.in.

  To my mind that pushing it even though you colonials always claim to have
  better steels than us oldies.

  [Non-text portions of this message have been removed]



   

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Received on Tue Oct 16 2007 - 03:26:08 CEST