Building corner shelves, need help
Hello. I am building freestanding corner shelves. 4 tiers, pie shaped, 24 inches, with 4 inch wide legs.
Not my first rodeo woodworking but it is my first time edge gluing wider pieces. I've always used fine grade plywood for my big pieces. For example, I used ash plywood for my desk and used biscuits and glue to join 1 1/4 inch thick solid Ash to the edge of the plywood.
For this project I am using solid ash. I thought it would be rather simple to be honest.
I cut each piece to 24 inches x 5.5 inches wide
Jointed the edges and planed the faces to 5/8"
Had nice, flat boards. Then I got busy for a week at my real job. When I came back I noticed a few of the boards were not so flat. I replaced those boards and moved to glue ups.
I used #20 biscuits and dry fitted each piece. Everything was good.
I used Titebond 3 Ultimate glue and brushed the glue on the edges evenly.
I used 2 clamps across the shelf. I also took 2 pieces of Pine across each shelf and clamped them down to each shelf with 4 clamps to keep everything flat.
Got them all done and leaned them against the wall.
Then I went on vacation for a week. Now I am back and 3 of the 4 shelves are cupped...got a not so nice, perfect curve to them causing the center to raise up from a flat surface 3/16 of an inch.
What did I do wrong?
Why did they warp? I thought the Pine wood spines would prevent that. I used them flat wise, not edgewise. They seemed pretty stiff and it looked flat. I guess I should have used them edgewise?
Should I put a spine under each shelf for both support and to keep them straight?
After running the wood through my jointer and planer to get them flat, I checked each board by laying it on my Delta table saw. It's a cast iron surface and I've checked it for flatness. Each board was flat. Why did some of them bow again? I'm in northeast Texas, DFW. Weather changes but I didn't expect the boards to bow that fast.
Any tips on keeping boards flat?
Any suggestions would be appreciated.
Last edited by markshane; 04-17-2017 at 09:22 PM.
Reason: correct grammar