Laminated Bridge Cap Construction

[Farrell]

Arg. Another way to spend a day. Would likely bend easier though. Can give it some thought. Not too hard to edge glue up a long block that you could cut all the pieces out of. I'll give it some thought. Dimensional stability would be nice though.

Terry Farrell
  
----- Original Message ----- 
From: "Ron Nossaman" <RNossaman@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, March 15, 2003 1:02 AM
Subject: Re: Laminated Bridge Cap Construction


> 
> >That is pretty much how I am making this bridge cap. I just cut the width 
> >oversize a few millimeters. I slopped on the epoxy just a few minutes ago, 
> >laid them up, and ever-so-gently set a big pinblock on top of it and then 
> >a couple of 50 lb. buckets on top of that. I just gotta hope and pray that 
> >I didn't knock anything sideways and made any of the laminations slide out 
> >of position. If that happened, I'll go to just laminating up a block and 
> >cut a cap out of that like you described.
> >
> >Terry Farrell
> 
> 
> With that horizontally laminated bridge root, I started with one layer of 
> end-glued pieces clamped to a 1x10, so I had a minimal number of pieces in 
> wet glue to deal with at any one time. A bit later, I added the second 
> layer. Then, after the glue dried some, I ran it through the planer to 
> level the surface, and glued and clamped on another layer of butt jointed 
> pieces. I could plane and add another layer every hour or so, so I did it 
> in a day, while I spent most of the day doing something else.
> 
> Another thing. cross laminating a vertically laminated bridge root should 
> make it both a whole lot easier to bend to any old dog leg you want, and 
> limit vertical dimensional changes with humidity swings to 20% of the 
> change a regular vertically laminated root will experience. I haven't made 
> an entire bridge this way (just short test samples), so I don't know quite 
> how much it would affect stiffness. That's a lot of edge gluing for the 
> cross ply laminations unless you have wide veneer sheets to cut them from.
> 
> Ron N
> 
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