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16 votes
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What is a good way to prevent jointed tabletops from bowing when tightening fasteners or the glue sets?

A common solution is to alternate your clamps between top and bottom: Another solution is to clamp boards down across the panel as Drew suggested, although an even better variation on this solution ...
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15 votes

Does dropping boards really relieve internal tensions?

I find this really hard to believe.. if dropping a piece of lumber did 'relieve stress' then there should be no stress in it by the time it makes it to your local lumber distributor-- it's been ...
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15 votes
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How to straighten a warped board

Your pallet board may not be worth the effort, but there are several techniques that you can try to salvage any warped board. The optimal solution will vary depending on how you intend to use the ...
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14 votes

How do you straighten/bend wood planks without removing any material?

Steam bending would be your only option. Wetting the fibers and allowing them to bend and twist. It might not work, but there is a chance. Not using a moister measure, you will just split the wood ...
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12 votes

How do you straighten/bend wood planks without removing any material?

The other answers have covered how you can bend the wood, but one thing they left out relates to the length of the wood. The following applies to some other defects too like bows. You mentioned you ...
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11 votes

What is a good way to prevent jointed tabletops from bowing when tightening fasteners or the glue sets?

I always clamp jointed boards with some good, straight hardwood boards across their faces. This way, you'll use long clamps across the face of the jointed boards to keep your joints together, and ...
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10 votes

Can I effectively use a table saw to straighten warped lumber?

There's a couple of ways to do it Create an "in feed" and "out feed" fence for the table saw fence (see http://www.woodworkingtips.com/etips/2005/01/28/wb/). The infeed is slightly narrower so as the ...
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8 votes
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How do I correct extreme crossgrain cupping?

You can get this flatter certainly, but you may not be able to get them totally flat or to get them to stay that way permanently — wood that has bowed can show a tendency to want to return to that ...
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7 votes
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How can I fix warping on board made of glued 2x4s

This is not really an answer but a large comment that could point out several pitfalls that could have brought you to this point. I am not sure of the best advice for your situation as the warping ...
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7 votes

How to straighten a warped board

If you do not need the exact thickness of the board you could just run it thorough a planer and or jointer to flatten it out. But if the board thickness is exactly what you need then I have seen a ...
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  • 171
7 votes

How do you straighten/bend wood planks without removing any material?

Bending using heat (usually steam) is one of the only ways to bend wood reliably. But, when a board twists as it dries that is usually not permanently fixable because the wood may have 'taken a set'. ...
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7 votes
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Is this a case of just using the wrong wood? (Warping)

The strips you secured to the bottom are the cause of the warping. The main boards can't expand and contract because they are fixed to the strips at a few points. If the boards were just glued to ...
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  • 4,796
6 votes

Does dropping boards really relieve internal tensions?

Stress is only relieved by either bending or cracking. If dropping cracks the wood in the right way, then stress is relieved. You could potentially relieve internal stresses by encouraging it to bend ...
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  • 2,396
6 votes

How can I fix warping on board made of glued 2x4s

I know cheap construction 2x4s can warp There are multiple possible causes for distortion in a glued-up panel like this. Often more than one of them are to blame, although there may be one major ...
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  • 58.6k
6 votes

Does MDF warp less than pineboards?

MDF is practically purpose-made for this application. It is very dimensionally stable, one of its prime selling points. And while it's not as stiff or strong as ply it is as a rule more stable these ...
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5 votes

Warped Walnut Slabs

We have to be careful in advising you here since what you mean by "warp" may not match the commonly accepted definition. Some people use the term generically to refer to boards that aren't flat along ...
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5 votes
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"Annealing" wood?

Your best 'chance' is using moisture. Basically getting the wood 'wet' and straightening it, then letting it dry straight. Some woods and small bends might work with wetting/moistening the board. ...
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5 votes

How do you straighten/bend wood planks without removing any material?

I have tried to straighten a wood screen door with steam with very little improvement. I then forceably bent it well past straight, 1 1/2 inches in center of the 7 foot span. Then saturated it with ...
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5 votes
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How can I design a large speaker cabinet to come together square and true when my panels aren't flat and my boards aren't straight?

In my view this is a question of "Do I control my materials or do they control me". Your concern that your warped pieces may not meet well is valid. Every project should begin with a plan for what you ...
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5 votes
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Wood warps after milling

It's not always possible to avoid it, but there are techniques to minimize this problem. Good quality lumber that has been well dried is the best start! Buy wood closest to needed thickness so you ...
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  • 1,843
4 votes

What are reliable ways of flattening out warped wood?

Common wisdom is that if you have access to a jointer and planer, you will joint the board on the cupped side to flatten it, then use the planer to produce a smooth edge on the opposite side. If you ...
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  • 3,995
4 votes
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How can I minimize warp due to wood movement when gluing up a panel?

Is the humidity in your garage the same as the humidity in the room where the dresser is kept? You can start with a board with 0% moisture content, but regardless of the finish you put on it, it will ...
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4 votes

What is a good way to prevent jointed tabletops from bowing when tightening fasteners or the glue sets?

No one has mentioned your jointer technique. If the jointer fence is not perfectly 90° then any small deviation get multiplied by the number of boards you have and you get a curve. The solution to ...
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4 votes

How do I correct extreme crossgrain cupping?

Adding to Graphus's answer, you can also cut the board down the middle run them through a jointer and reglue them back together. If you can flip one side over for the join, you will reduce the max bow ...
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  • 15k
4 votes

Does MDF warp less than pineboards?

MDF is much more likely to be flat and is relatively dimensionally stable - however it's not overly strong when running long unsupported distances. If the pelmet is attached at its top along the ...
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  • 1,033
4 votes
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Should I seal my bed slats, and if yes, with what?

He thinks that the bed slats might warp if I don't use a sealer. A 'sealer' won't make much or any difference to this once the slats are fixed in place and in use. I use quotes above because the ...
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4 votes

Best way to cut a thin board that resists warping

Are you familiar with how the wood fibers are aligned in a tree? They (mostly) run from top to bottom and are bonded together with lignin. If you used the 'B' method the wood fibers would be running ...
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  • 536
4 votes

What determines whether a board will warp or stay straight?

TL;DR: Wood Never Sleeps. Wood is a natural product, with natural variation across species and individuals. Not only that, but how timber is grown and processed into dimension lumber also varies. And ...
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  • 6,164
3 votes

Warped Walnut Slabs

Essentially: No. You make slabs flat by removing wood to obtain a flat surface, by planing or by using a carriage-guided router or by machine-sanding or some combination of these. Sometimes you can ...
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  • 9,091
3 votes

Does dropping boards really relieve internal tensions?

If a board were to lose its internal stresses by dropping or for any other reason it would take on a new shape and be warped, twisted, curved and in need of reshaping. If you have ever ripped a thin ...
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