Building corner shelves, need help - Woodworking Talk - Woodworkers Forum
 
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post #1 of 3 Old 04-17-2017, 09:21 PM Thread Starter
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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.

Thanks
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Last edited by markshane; 04-17-2017 at 09:22 PM. Reason: correct grammar
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post #2 of 3 Old 04-17-2017, 10:02 PM
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When gluing up wood, I like to leave the final sizing until the last. After taking the boards out of the clamps, run them through the planer taking off only the minimum to insure the boards are perfectly flat after glue-up.
Also, it sounds like you left clamp pressure on your boards for a week. In warm weather, I start removing clamps after 4 hours. Boards will bow if left under pressure for a week.

If you don't have time to do it right the first time, when will you have time to do it over?
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post #3 of 3 Old 04-19-2017, 05:56 PM
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Best strategy is to make sure the boards have alternating end grain when glued up to make a wide panel.
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