my 13-inch thickness planer was "skipping" as it fed thru a 12-inch maple plank;
each stop-point had a crosswise divot, too deep to sand away.
Took apart the left end (where the roller-drive chains are) and found that the
outfeed roller's bearing block was toasted -- had worn into oblong shape and
caused the roller to jump every few revolutions. Ordered a replacement and
re-assembled with the block rotated 180. The darn thing ran right and I
finished the job.
Don't be afraid to mechanic yer toys.
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