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Forum topic by glassyeyes posted 08-31-2010 11:24 PM 1313 views 0 times favorited 4 replies Add to Favorites Watch
View glassyeyes's profile


137 posts in 4406 days

08-31-2010 11:24 PM

Topic tags/keywords: oak white oak warp straighten cupped

I’m looking for suggestions for dealing with a large glued-up slab that has cupped across the narrow dimension. It is white oak, 26” wide by 72” long by 1 1/4” thick, made of three boards, with the ring pattern alternated (bark side up, bark side down, and bark side up). It bows 1/16th of an inch at the midpoint. I can’t plane it any thinner—the other table top has been constructed, and the two tables will be side-by-side.

1. Should I attempt to correct the bow before assembly, or depend on the casework beneath to straighten it out? (The frame is fairly heavy, and much of it is concealed. I plan on using pocket screws to mount the top.)

2. Is there a worthwhile method of clamping the wood for a while? Wet one side? Expose one side to the sun, to dry/shrink it?

Any suggestions would be appreciated; re-making this top is going to get expensive.

-- Now, where did I put those bandaids?

4 replies so far

View ajosephg's profile


1897 posts in 4638 days

#1 posted 08-31-2010 11:47 PM

1/16” in 26 inches? If was me I wouldn’t sweat it – let the hardware pull it down. But I wouldn’t use pocket screws because they won’t let the top expand and contract, which will lead to a broken top or case.

Should use Table Top Fasteners that allow expansion, but still hold it together.

-- Joe

View levan's profile


472 posts in 4056 days

#2 posted 09-01-2010 01:07 AM

I agree with Joe 1/16’ should not be a problem. I think you could use screws if you slot the shank holes so the top can move.

-- "If you think you can do a thing or think you can't do a thing, you're right". Henry Ford

View patron's profile


13718 posts in 4418 days

#3 posted 09-01-2010 01:13 AM

when you do screw it down ,
clamp a strong back to the top and the rails ,
that way the screws wont strip ,
as they are pulling it down one by one .

i agree , 1/16th isn’t a big deal .

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View glassyeyes's profile


137 posts in 4406 days

#4 posted 09-01-2010 02:28 AM

Thanks, guys! The “legs” are actually flat panels, for a modern look; I was thinking about running something like a glue block along the inside edges of the base cabinet portion. I could then use levan’s idea of slotting the outside screw holes for movement and patron’s idea of strongbacks during assembly. I knew I could get some good advice on LumberJocks.

-- Now, where did I put those bandaids?

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