This article is from the Woodworking FAQ Collection 1, by multiple authors.
End snipe occurs when the wood looses contact with the infeed roller
and allows it to rise slightly from the bed of the planer. Snipe can
also happen on the beginning of the board as well. Snipe can be
minimized or eliminated by providing support along the full length
of the board on both the infeed and outfeed sides of the planer.
Proper tuning of the planer is also important in minimizing snipe.
Another way to minimize snipe is to do all of the planing before
cutting pieces to length. This way the only snipe loss in confined
to the end of 1 piece of wood.
 
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