wrote in message
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The saw is a horizontal band saw using a 3/4 blade. The problem is new
and is not related to blade pitch or to a particular blade. When
sawing 5" diameter aluminum the cut is square for about a third of the
cut and then the cut becomes concave for a little more than a third,
and finally the cut straightens out. The roller saw guides are
adjusted properly and the saw cuts square otherwise. The concavity is
about 1/16 inch. Anybody seen this before?
Thanks,
Eric

I've seen this too, even with proper blade tension. As Yooper
says it's the chip load filling up the gullets on a wide piece. A
blade with bigger gullets (fewer TPI) or reduced feed rate/pressure
usually fixes the problem.
Art