Frank Boettcher wrote:

Now I'm confused. I always thought (maybe erroneously) that the
primary expansion was in the direction of the grain,not cross grain
and not uniformly in both directions. That would be, on the OP's
top, in the 42" direction, across the table. Have I got it backwards?

Yes.

And depending on species, tangential movement due to moisture content
changes is anywhere from 50% to 150% greater than radial.
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