Reply by CaptainKlutz

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Posted on Straightening cupped table top

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1880 posts in 1999 days

#1 posted 08-03-2019 03:04 AM

IME – 8/4 sapele (especially rift or flat sawn) is not a wood that can be forced into flat shape easily.

If you clamp thick sapele with excessive pressure to make it flat, it warps like a pretzel when clamps are removed. Worse, it keeps moving with every change in moisture level. DAMHIK

Suggest you use heavy steel batons under the table and pray you can keep it flat, or
Better method is to rip it apart and reglue the boards to show zero warp.

The boards must be flat before glue up to get a flat panel. Period.
So remove any twist/bow/warp BEFORE applying glue.

Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

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