Bridgetop Extravaganza Revisited

[David Love]

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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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