Bridgetop Extravaganza Revisited

[Carl Meyer]

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Let me see now.  If the radius of the soundboard as measured underneath =
is 65 feet, then the radius on top should be 65 feet plus .375 inch =
except for the edges which would be 65 feet plus .375 minus .100.  =
Actually, it wouldn't truly be a radius since it is not really a part of =
a circle.  I can't decide what kind of figure that would be.  Oh! forget =
the whole thing.  You guys got too much time on your hands.

Carl Meyer  Assoc. PTG
Santa Clara, California
cmpiano@attbi.com=20
  ----- Original Message -----=20
  From: David Love=20
  To: Pianotech=20
  Sent: Thursday, December 19, 2002 7:57 AM
  Subject: Re: Bridgetop Extravaganza Revisited


  Does that mean that you should add to the measured crown when using =
the string test from underneath for the same reason?

  David Love
    ----- Original Message -----=20
    From: Erwinspiano@aol.com=20
    To: pianotech@ptg.org=20
    Sent: December 19, 2002 5:53 AM
    Subject: Re: Bridgetop Extravaganza Revisited


    In a message dated 12/18/2002 6:11:40 PM Pacific Standard Time, =
davidlovepianos@earthlink.net writes:


      Subj: Re: Bridgetop Extravaganza Revisited=20
      Date: 12/18/2002 6:11:40 PM Pacific Standard Time
      From: davidlovepianos@earthlink.net
      Reply-to: pianotech@ptg.org
      To: pianotech@ptg.org
      Sent from the Internet=20



      Get two blocks of wood measuring exactly 7" high.  Place them on =
the soundboard at opposite edges of whatever part of the piano you want =
to measure.  Put a straight edge across the top of the two blocks and at =
a point midway between the blocks, measure the distance from the bottom =
of the straightedge to the soundboard.  Subtract that number from 7" and =
the amount left over is the amount of crown.
       =20
      David Love
                    Hi Dave

               Not so.  In Steinway and other pianos the net result of =
the diaphramizing (panel thinning) can leave the board thickness at the =
edges where the blocks are placed at .250 thick and the middle of the =
board can be as much or more than 100. thicker. Even with a flat board =
this method of measuring crown would give a false reading as the middle =
of the board will always be thicker (higher) than the edges. If you use =
this method you've got to factor this in.
           Dale Erwin


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