Reply by jonah

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Posted on JET 708457K JJ-6CSX Jointer

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2072 posts in 3683 days

#1 posted 04-07-2018 12:23 AM

A planer makes two sides of a board parallel. It doesn’t make one face of a warped board not warped, at least not unless you build a finicky sled for it and run the board through on top of it. After going through a planer in the normal way, a warped board will be equally warped on both sides.

The only tools that easily flatten and straighten the face of a warped board are jointers or hand planes. Jointers also make the jointed edge of the board perpendicular to the jointed face of the board, so that when you run it through the planer and then the table saw, you end up with a flat, square, and straight board that is perfectly rectangular.

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