At 06:30 AM 11/10/2003 -0800, you wrote:
> The
>trusses in the roof structures of newer warehouse type
>buildings are often designed this way.
>
>Dave Davis
>Renton, WA
Exactly,
I've used rebar, in truss formation, to strengthen jigs for bent
laminations. For one application, I had a stretch that was four feet long,
and only two inches wide. Scraps and trimmings from that run (walnut and
ash) are still floating around, after three shop changes. The "sandwich"
was formed with 1/8in strap steel. One half was truss-welded to a fixed
surface, and I used 1 1/2 in angle steel with bolts to squeeze the
laminates. Air ratchet sped up the process. Start at one end, etc. The
trussed-up side didn't flex at all. 3/8 in rebar, zig-zag spot welded.
Gotta watch out for the effect of the spot welds on the inside of the strap
steel, though. A little masonite with contact cement helps, but be sure to
calculate that into your arcs for thickness. Weight?.... well.... it's a
trade-off. I don't mind heavy. Mass peer, y'know.
Later,
Guy
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