Upright and Grand rims, was: Impressive Steinway Upright

[Alan R. Barnard]

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Why does the high treble scale not have slightly thinner, somewhat =
longer strings? It seems to me that the short speaking lengths would =
contribute to lack of sustain, excess hammer sound vs. musical tone, =
difficulty in tuning etc.

If breakability is a principal reason, could not the action be modified =
at that end with more let-off or such.

I am fully aware that this question probably is naive, based on my =
limited experience, so I brace myself for incoming ...

Alan Barnard
  ----- Original Message -----=20
  From: jolly roger=20
  To: Pianotech=20
  Sent: Sunday, September 15, 2002 2:00 PM
  Subject: Re: Upright and Grand rims, was: Impressive Steinway Upright



  Hi Del,
               Nice drawing, kind of in line with some of my ideas of =
theoretical centreing of bridges for grands.
   What we tend to forget is that, the vibrations spread out from the =
bridge like a pebble thrown into a Mill pond. In a grand, because of the =
strike line and the position of the belly rail, the bridge is far from =
centred.  Some of this problem may be alleviated by varying the rib =
height. Thinner to the short side, taller to the long side.
  The design of the case and action position of vertical pianos will =
always give more flexibility than in a grand.
   The thickness of the belly rail joint ( reflector ) to the board in =
the top treble is going to be a problem, along with where the bridge is =
fixed, vs the hammer line.
   Lots of tap dancing is done in the extreme treble to get  better =
sustain, duplexing, undercutting the bridge,etc.  Ever tried putting an =
apron up there? I know off the wall.mmmmmmmmm  Shoot me I am being =
revolutionary.
  With accujust  hitch pins to reduce board loading in a controlled =
manner, along with an apron, and finally a variable height rib, we could =
theoretically centre that bridge.
   Sunday musings.=20
  Roger  =20

    Good (no, excellent) explanation so far.

    But it's not any super-secret shape--though it is patented--and it =
has been
    pretty well developed. A jpg drawing of the soundboard assembly as =
used in
    our upright is attached.

    Del


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