Bowed Glue Up

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Forum topic by Nighttripper posted 09-08-2012 06:42 PM 1116 views 0 times favorited 3 replies Add to Favorites Watch
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41 posts in 2190 days

09-08-2012 06:42 PM

Hi All,

Question: I made a box of Poplar about 2 weeks ago, but I never got around to putting a finish on it.

I left for a business trip earlier this week and the box was fine; however, I just got back and found the lid quite bowed. After reading up on what could have gone wrong, I found that I may have over tightened the clamps. I also probably didn’t give the wood enough time to adjust to my shop, but I don’t suspect that is the problem.

My question is: As I was doing the glue up, the panel did want to bow, however, I put a brick on the center to keep it flat; and it was flat for at least a week thereafter.

Any ideas as to why it took over a week to bow ? Also, I have a lot of pressure on it right now to flatten it, but I suspect it will not work or may snap the joint ???

3 replies so far

View Grandpa's profile


3259 posts in 2698 days

#1 posted 09-08-2012 06:46 PM

moisture or humidity change….increase? did you keep it out of the sunlight? Sun can do terrible things to lumber.

View Gerald Thompson's profile

Gerald Thompson

971 posts in 2257 days

#2 posted 09-08-2012 07:44 PM

I had the same problem with the same wood. I glued up large panles using cauls and they were as flat as..well a board. I left them in my garage shop for a couple of days and when I went to get them they were all warped. I just knew it was all of my doing. I took them into the house and in as little as 8 hrs they were comimg back.
Try putting your work in a place that had about the same atmosphere as it came from before working with it.

-- Jerry

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41 posts in 2190 days

#3 posted 09-08-2012 09:48 PM

Thanks Gerald I will give that a shot….

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