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Darryl Keil

Last Activity 2025-02-12 2:48 PM
2 replies, 1072 viewings

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Lary

Subject : warped panel - any fix?
Posted : 2003-03-03 6:28 PM
Post #28709

A veneered panel came out of the press warped. the panel has 1/8" baltic birch core with 1/16" B.E. maple on both sides. the veneer was glued on to both sides at the same time. Its ~ 16"x29".i have a hunch that it warped because I took too long spreading glue on the second side of the core allowing the first veneer to expand more than the second - its just a guess. the cup or bow is less than 1/8 of the length, some across also however it is enough to bow the door frame on the cabinet. Is there a solution that wont eventually return to this same degree of stress? I should mention that the concave side will not be seem so something could be done to it. Any suggestions?

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Thomas Stender

Subject : warped panel - any fix?
Posted : 2003-03-04 9:29 PM
Post #28711 - In reply to #28709

Lary,I'm a little unclear as to the amount of bow (curve along the grain) you have. Do you mean 1/8" over the length? Or 1/8 of the length, which would be some 3 1/2" of curve? I'm assuming it's somewhere between there. Anyway, one thing to try would be to glue one or more slats on edge to the back of the panel. They should be as long as the opening in the frame and curve the opposite way that the panel does. Clamp them to the panel to test their effect, and plane them narrower until they help the panel flatten. Glue and clamp to a flat surface.Now to causes: Am I correct that the grain on both sides is running in the same direction, the long dimension of the panel? Then I can't figure out why this would happen. Even if one side was glued well before the other, they should both absorb similar amounts of moisture from the glue. And that would only be a concern if the surface veneer of the plywood was running the short dimension of the panel. You did glue up with a sturdy platten or backing board in the press, too, right? If all that is true, I think you have to chalk it up to "plywood does some strange things sometimes."Let me know if any of this does or doesn't make sense.Good luck,Tom

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Lary

Subject : warped panel - any fix?
Posted : 2003-03-05 8:03 AM
Post #28714 - In reply to #28711

Unfortunately the slat idea will not work because theirs no room for them - that is why I had to make such a thin panel. To clarify the warp, if the piece is laid on a flat surface, only the corners touch, there is slightly less then 1/8" gap in the middel of the long dimension and I can't remember how much in the short dimension. yes the veneer (1/16" thik) is runing with the long direction of the panel and the face veneers of the plywood are running crosswise. It was veneer with a flat 1"MDF platten that I've had luck with before. The veneer was not absolutely flat at the beginning because it came from a warped board however because of the book match these alternate and I thought should not be significant once glued.I'm at the point now of making my own 1/8" ply to make sure it flat and then applying more B.E. maple.

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