Reply by Lee Barker

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Posted on Flatness of double-layer MDF vs. torsion box

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Lee Barker

2170 posts in 2845 days

#1 posted 11-08-2011 12:03 AM

In a given area, MDF can be impressively flat but a full sheet may not be so flat because of exposure or storage errors or mishandling.

If you had two identically cupped 3/4” sheets, and glued them together convex to convex, you might have all you are thinking you need.

The unflatness in a given sheet diminishes with thickness. Therefore, I’d suggest 1” piece of MDF if you really think that much mass is required.

I have been working off the same assembly table top of 3/4 particle board for about 17 years. There is some webbing underneath. It is screwed down from the top. Pretty practical all in all, and it’s never failed or broken or even talked back to me.



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

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