Had a less serious but similar thing with my 580 The blades were getting
dull and I had just a couple more passes to go. All of a sudden, it was
noisy as hell and cut a concave area in the board. Pissed me off as it was
the last of the maple stock I had. Blade was bent but the retainer was OK.
Now I keep an extra set of blades on hand and vow never again to tray to get
that last pass or two when I know they are getting dull.
do you sometimes push it hard for long periods?
I suspect that the blades are engineered to transfer some heat through
the cutterhead for cooling. if you pushed it hard enough to heat up
the blades and the blade warped up a little, sawdust could get in
there and the blade would lose contact and heat up faster, so the gap
would grow as the sawdust packed in and the blade heated.
or maybe that's not how it happened.
so how come you don't have a full size planer?
If you have bottom rollers on that planer, I'd check to see
if they are adjusted properly. Looks like the wood you
were planing (paduak?) caught on someting as it was feeding
through. Possibly the chipbreaker if that planer has one.
Was it a long or short piece?
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