I'm guessing that your outfeed table is too low relative to your cutter
knives. If this is the case, the portion of the board that rests on
the infeed table is allowing the board to bridge over the cutter until
the tail end of the board falls off the infeed table. Then the board
drops until it is caught by the outfeed table. I'll bet the finished
edge of your board isn't truly straight (not counting the snipe)
As others have said, place a straightedge on the outfeed table with the
end hanging over the cutter. When the cutterhead is turned by hand
(while following accepted safety precautions), the blade should just
scrape the straightedge without lifting it.
"We are all ignorant, just about different things." - Will Rogers
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