Reply To: raised table top board, 5 inches from edge.
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In lieu of supporting evidence, this probably isn’t worth a farthing; but, anyway, here are a few thoughts.
A temperature constant around 25 – 30 °C (80:s °F) and non-varying humidity would suggest US Southern East Coast, and thus Eastern Red Cedar, which must be a species found in a lot of traditional furniture dating to when hide glue (with or without drawboring) was the only adhesive available. Hence, I think that any water based glue should work (the wood database internet site also states that Eastern Red Cedar glues well).
The photos seem to show a slight elevation on the upper face and none on the lower. If so, would that be compatible with a twist in the board, or perhaps more indicating a very regional discrepancy in humidity? Reappearing warp does – in my depressingly rich experience – go all through the thickness, while the effects of changes in humidity don’t always do.
It is of course most likely that the somewhat more prominent glue line of the deviating 5″ is a shadow effect, but if not then perhaps an increase in humidity could have occurred.
All in all: would there be great risks in planing those obstreperous five inches flat, and then observe what happens, Alternatively, I imagine that opening up the joint line with a fret saw, or some other saw leaving a very narrow kerf, would allow for re-application of glue, and then clamping the edges very tight, while at same time pressing the faces flush.
Finally, if turn buttons are holding the top to the frame, would it be at all feasible to take the top off, find a bandsaw with a very narrow blade, a user of great skills, and saw along the glue line; allowing for a complete rework of the faulty board?
Royal Enfield: magnificent!