DerbyDad03 wrote in news:79638a7b-5870-4e5c-a4f7-
:

I don't have a jointer (obviously) but how can a light pass cause the
board to taper? Whether jointing on a router table or on a jointer, aren't
you taking off the same amount of wood along the entire length of the board?

Not necessarily, no -- and that's what can produce a taper.