Rim Bevel

[Farrell]

For all you soundboard builders that use tighter arcs than a 60-foot radius: I think the 60-foot radius arc is common on most old pianos (at least the crown was about that when the board was new), and I suppose many newer ones. And I assume that the edges of a 60-foot radius board will have an angle of about 1-1/2 to two degrees at its edges - about the same as the bevel on the inner rim. Now, when you go to 40 or 30-foot radii - or even tighter - surely the edge of the board forms a significantly steeper angle from the horizontal than that of a 60-foot radius board.

My understanding is that the bevel of the inner rim is very important to the soundboard maintaining its crown. 

So, the question is do you put a steeper angle on the rim bevel, do you angle off the outer 3/4 inches (however wide the inner rim is) of the board to match the existing rim bevel, or do you just clamp the darn thing together and all seems to work just fine.
  
Terry Farrell