bbhack
Posts: 2
Joined: 2014-12-01
Location: Memphis
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That wasn't very clear was it. And maybe I am over thinking this. But:
By thick veneer I mean 1/8-3/16" thicknesses resawn from 8-12" wide stock. By lamination I mean face gluing a number of these to a total thickness of 1/2-1" usually on a curved form for things like curved drawer fronts. I usually make flat panels with a solid core, either solid wood or plywood depending on the panel size and joinery. The grain of all layers is parallel, no cross banding. Because of the width of the panels, stock is almost always plain sawn so seasonal movement is going to mostly be across the width, which can be 1/4" for the domestic species I use.
I am assuming that no glue line can restrain wood movement. As I said, short term the bonds appear to be stable. But one might think that much movement, repeated annually over a long period of time would exert tremendous stress on a rigid glue line. I suppose whether or not and when the bond will eventually fail when is speculative at this point. Perhaps too much so. But I'm curious about whether a more flexible glue like the PVAs would be the better choice for the applications I described.
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