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Aaron Paris

Posts: 55

Joined: 2014-11-28

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Subject : Serpentine Laminations
Posted : 2020-01-19 7:49 PM
Post #37868

I have a large project that is made up of several vanities,desks and credenza's. All of which are of different shapes made up of convex and concave radius's. (Thanks a lot Interior Designer's!) For each cabinet I've had to make forms to press the doors and drawer fronts to the desired shape. I couldn't find any suitable bendable plywood that would bend tightly and that didn't have such a stiff core, so I created my own. I took 1/4" plywood and sanded down the outer face veneer which left just the poplar core. At the plant this core is softened or tenderized somehow which makes it very flexible once the outer veneer is gone. So my laminations are a 2 ply maple( grain running vertically on the face,horizontal on the back)5 layers of the poplar(grain running vertically) then the 2 ply maple again for the backside( grain running same as face)creating a 3/4" finished thickness. On some of the cabinets I had to use an aluminum phenolic instead of the maple. All laminations were glued with pva Titebond Extend,pressed for 48 hours and left to cure for another two days before trimming to final size.
Still with me?? Sorry, I'm getting to the point now.
The shapes that have the maple want to twist after I cut them apart into drawer fronts. The one's with the aluminum phenolic stay perfect as when they came out of the vacuum bag! I thought I might have an issue with the laminated panels drying out,so after the 4 days out of the bag I put a good seal coat of conversion varnish on all sides to help seal things up. That didn't help,there was still twists after I cut it into the separate drawer fronts. These fronts are 6" and 12 " high and have at least an 1/8" twist!
Not sure what's going on?? Any thoughts are welcome!
Thanks Aaron.





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