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 Post subject: HELP !!!!!!!
PostPosted: Sun Apr 11, 2010 12:18 pm 
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I glued up 3 pieces of soft maple for a table top. I alternated the growth rings. I used cauls when I glued it up, left it in the clamps for a minimum of 24 hours, used biscuits and Titebond III glue. The wood was in the shop (garage) for 3-4 days before I glued it up and has been in the shop for 4-5 more days. I sanded it and routed the edges. It has been laying flat on a flat surface. I went out to final sand it and the side edges have turned up approx 1/4" on each side. Maybe I could make a bowl out of it. I put cauls back on it. It is 48" long and 16" wide 3/4" thick.

What do I do now to keep it from staying like it is or get worse?

Any help would be appreciated.

Thanks,
Bill

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PostPosted: Sun Apr 11, 2010 12:31 pm 
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Did you sticker it? whats the humidity like?

I would leave it right where you had it and flip it over. Keep an eye on it so it does not just cup the other way. I once put a board on the fron lawn for a couple hours (oops) I just flipped it and it fixed itself.


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PostPosted: Sun Apr 11, 2010 12:40 pm 
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I would stand it up so both sides can get equal amounts of air and let is sit for a few days. If it was flat on a bench or something similar, the up side may have dried far more than the bottom side. That always leads to som warping. Letting it equalize might get rid of most of the warp anyway. Perhaps enough that you can pull it down when attaching it to the frame? I have gotten away with that in the past but the remaing warp was not bad.


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PostPosted: Sun Apr 11, 2010 1:05 pm 
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If the piece is cupped, put it on grass in the sun cupped side down. Check in about 15 minutes and then keep an eye on it from there.


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PostPosted: Sun Apr 11, 2010 1:44 pm 
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hebertoo wrote:
If the piece is cupped, put it on grass in the sun cupped side down. Check in about 15 minutes and then keep an eye on it from there.


I don't think I would do that with a glued up panel. A single board, yes. But I'd worry about causing some problems in the center board on this panel, which might aggravate the overall problem since the center board would likely cup in the opposite direction.

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PostPosted: Sun Apr 11, 2010 2:39 pm 
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Perhaps Bread borad the ends. just a thought.

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PostPosted: Sun Apr 11, 2010 2:44 pm 
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I like

I would leave it right where you had it and flip it over. Keep an eye on it so it does not just cup the other way.

Then


I would stand it up so both sides can get equal amounts of air and let is sit for a few days.

Then if you have to

Perhaps Bread board the ends. just a thought.

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PostPosted: Sun Apr 11, 2010 2:50 pm 
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Thanks guys, I think I will leave 3 sets of cauls on it, it is flat with them and let it sit. I think there will be enough air on both sides to let it flatten out if it is going to, and I can move the cauls every day or two.

Thanks, knew I could count on you guys.

Bill

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PostPosted: Sun Apr 11, 2010 7:10 pm 
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Bill, I can't add aything to what the others said but, IF it does flatten out, I think that I would get some sealer and or finish on it ASAP. Finish on both sides and all edges! And don't lay it down falt again! Either stand it on end or be sure to have stickers under it for air flow.
Either I have been lucky or just didn't notice but, I've never ran into that problem. That is scarry!

Rog

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PostPosted: Tue Apr 13, 2010 5:35 am 
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Bill - you are definitely going to need some breadboard ends or battens on the bottom of that sucker for the long run. They will help keep that top flat over time...

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PostPosted: Tue Apr 13, 2010 10:18 am 
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All the advice is good. Since the board cupped up, the bottom was wetter than the top. Which means you did not allow enough time to acclimatize, and the top dried, or you added wet to the bottom by leaving it close to the concrete floor or similar.

I'd clamp it to a couple good crosspieces to urge it back into shape. maybe even wedging the ends an eighth in reverse. Let it equalize, then remember to put the same finish and number of coats on the underside of the piece. You can loosen this requirement by using shellac as your bottom seal, since it takes up moisture slower than oil-based, and even acrylics according to experimental data in FWW.


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