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Recently, any time I tried to flatten one side of a board, my jointer
would start the cut OK but would remove less wood on the last 2/3 of
the board. Eventually my board was wedge-shaped with the front edge
narrower than the rear.

This is not uncommon, even with a well setup jointer. Despite the "wedge"
shape, was the jointed surface of the board flat?

If so, that's all you can expect from the jointer.

To get rid of the wedge shape, and make the opposite surface/edge parallel
to the jointed surface/edge, enter a planer for the surfaces, and the well
setup table saw/fence for edges.

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Last update: 12/13/05