Soundboard Installation & MC

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Erwinspiano@AOL.COM=20
  To: pianotech@ptg.org=20
  Sent: April 26, 2002 1:28 PM
  Subject: Re: Soundboard Installation & MC


  Ron wrote:
      You're still talking about something like 0.003" rim spread from =
full crown to flat.

  Dale wrote
  >>>>I'm not sure I agree with that. I'm about to press up an Stwy L =
board and  after it's pressed and crowned I'll measure across the bottom =
from each end of the longest rib and then I personally will sit or stand =
on  the board on the floor and see how far the rib dimesion expands. Hmm =
this might be hard to measure but I'm going to try anyway. Maybe I'l =
just make a mark on the floor at each rib end and visually observe. Ever =
done this? It seems to me that .003 figure would have to be greater for =
the crown to completely collapse.
Actually this sounds about right. I figured this out as well for one of =
the Journal articles I did a couple of years back in which I wrote about =
this very topic. The difference isn't much. Certainly not enough to =
qualify the structure as a buttressed arch.

I've no idea why this idea persists in the face of fairly easily =
provable facts and reasonably clear logic. Good marketing ideas die =
hard, I guess.

Del



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