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Setting jointer knives appears to be universally every woodworkers worst duty. When I talk to woodworkers, the one thing they hate doing most is setting jointer knives (although many also hated setting planer knives, but that`s another article).
One of the biggest problems is many did not know what height the knives should be set at. Many woodworkers believed that jointer knives should be set at the exact height of the outfeed table. Which in theory would be correct but in practice is not the best idea. I even had some woodworkers who adamantly believed the jointer knives should be even with the infeed table. This is the WORST thing you can do if you EVER want to get straight, flat boards.
If you set jointer knives BELOW THE LEVEL OF THE OUTFEED TABLE, the boards you run through your planer will be bowed like the lower runners of a rocking chair. The more you run them through the jointer the more bowed they will get ... to the point, the only way to correct the bowing is to mark a straight line down the length of the board and run the board through a table saw - freehand. THEN adjust your jointer knives correctly and start all over again runing the board through the jointer.