[pianotech] soundboard glue down

[David Love]

Yes, but I glue the board down as a one piece and don't have any problems as
do any number of piano builders who use large bass cutoff bars (Bosendorfer
comes to mind).  The amount of flexing also depends on the rib radii you are
using.  Clamping is easier if you separate the panel along the cutoff but
I've found a method which is pretty easy involving a beam across that
section held in place by clamps with a space between the beam and the panel
into which you drive wedges from both sides to force the panel down to the
cut off.  

David Love
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of jimialeggio
Sent: Thursday, April 01, 2010 5:51 AM
To: pianotech
Subject: [pianotech] soundboard glue down

Terry's belly pic on the pinblock insert thread brought this to mind.

Terry shows a 2 piece board, main board and cutoff. That's the way I've 
done it. However, in the future I think that I will be doing a one piece 
board, as I think it will actually be less work than the 2 piece board.

In rim glueing a one piece board which spans the cutoff bar is, since 
the crown terminates at the cutoff, is there some kind of weird flexing 
that happens in the bass corner as the board transitions from curved to 
flat at the cutoff?

Jim I

-- 
Jim Ialeggio
grandpianosolutions.com
978- 425-9026
Shirley, MA