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Steam Bending Plywood
Just got back from the supplier on the above mentioned ply and
discovered that it was all exterior glue.... looks like I will most likely ored in the 1.5 mm finnish birch from an aircraft supply co. It is rated finnish grade gl-11 anyone know if this is water proof? Kevin |
Steam Bending Plywood
make that finnish grade gl-2 on my previos post.
Kevin |
Steam Bending Plywood
Aircraft rated ply is one step beyond marine rated: specifically, it
must have no voids and no patches in any ply, and be waterproof glue laminated. Brian W On 29 Dec 2003 11:05:49 -0800, (Kevin) wrote: Just got back from the supplier on the above mentioned ply and discovered that it was all exterior glue.... looks like I will most likely ored in the 1.5 mm finnish birch from an aircraft supply co. It is rated finnish grade gl-11 anyone know if this is water proof? Kevin |
Steam Bending Plywood
My brain must not be fully in gear today.....
the problem with the long list of ply that I found is that it was all interior grade glue... not exterior as I stated above (guess the mental clutch is slipping). So now I think I will either do a layer of 1.5mm gl-2 finnish birch followed by 6mm of chopped glass and resin, topped by another 1.5mm birch ply (for 9mm of material) or 4 layers of the birch sandwiched out with glass & epoxy to the desired 9mm. Which of the above techniques will be stronger? The birch is sold in 4'x4' sheets at around $24.00 a sheet plus shipping (about $10.00). I am trying to also decide which will be more cost effective as I haven't decided wich is more expensive, an extra sheet of birch or the epoxy and glass needed to build a 6mm inner core. Any thoughts on which technique is more cost effective? As for bending: I will soak the birch in a very hot bath, throw in some amonia (into the hot bath), and spot spray with water & heat it with a flat iron as needed while applying it (a technique I saw described in one of the model airplane building groups where the guy said he wrapped 6 inches 1.5mm around a pencil, in a very tight spiral). Thanks, Kevin |
Steam Bending Plywood
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Steam Bending Plywood
Well.......
I bent and glued in the first layer of the 1.5mm finnish birch. Didn't even have to steam it, just bent it around my buck. Today I am going to do a couple layers of chopped glass mat, and maybe the outer skin. I did test a chunk of the birch, submersing it in hot water. VERY flexible, I bent it to about a 2 inch radius. Cut the birch to shape using a utility knife. Was afraid that a saw would have ripped it to pieces. Kevin |
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