Reading a dial gauge

[Sarah Fox]

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Hi Joe,

You would have to move the side supports closer to the plunger on =
David's gauge, so that they are spaced the width of the bridge or less.  =
For instance, just make a base that has supports 1/2" on each side of =
the plunger.  Place the plunger on the string just adjacent to a bridge =
pin.  Then use these formulas:

A =3D angle of deflection
d =3D deflection

A =3D d / .00437

d =3D A * .00437

You can also use the depth plunger on a small pair of digital calipers.  =
Make a "base" for the thing similar to David's, except with 1/2" =
spacing.  Zero the scale, then measure.  The value will be negative, but =
that's OK.

Peace,
Sarah



  ----- Original Message -----=20
  From: Joe Garrett=20
  To: pianotech=20
  Sent: Wednesday, July 06, 2005 2:41 AM
  Subject: Re: Reading a dial gauge


  Hmmm? all very interesting, indeed!=20
  NOW, how's about the possibility of measuring the front angle and the =
back angle???? It seems logical that one could run the center foot of =
the gauge to the front pin, leaving the back foot at the back bridge pin =
and the front foot all the way out on the speaking length. Reverse this =
and you get another reading off the back scale. Is this a feasible way =
to calc both of those angles?
  Inquiring minds want to know!!!<G>
  OR: perhaps put the plunger at one end, 1" from the  two solid feet, =
1" apart that both sit on the flat of the bridge? Hmmm? (as the king of =
siam said: "is a puzzlement!"<G>)
  Regards,
  Joe Garrett, R.P.T.
  Captain, Tool Police
  Squares R I
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