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Few tips from finewoodworking for fixing a taper.

"First, try transferring pressure to the outfeed side of the workpiece as soon as possible. Keeping pressure on the infeed side will cause tapering.

If that doesn’t work, check that your outfeed table is set slightly below the highest point of the knives’ arc. Align the cutterhead so that one blade is at its high point and lay a straightedge across the knife and table. There should be a gap no greater than the thickness of a sheet of photocopier paper between the straightedge and outfeed table just after the cutterhead.

If aligning the outfeed table doesn’t get rid of the taper, check that the infeed and outfeed tables are coplanar. Raise the infeed table to full height, move the cutterhead so that no knife is above the tabletop, and lay a 4-ft. straightedge along the infeed and outfeed tables. If the tables aren’t in the same plane, you’ll have to shim the ways to fix the problem."

The second tip fixed my General jointer with blades.
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