I installed the knives so that the difference in height across a blade is about .002 in. I then adjusted the blades so that the max difference for t he 3 blades as they rotated on the cutter head was about .003 inches.
I then set the height of the tables and ran a test board of kiln dried popl ar through. I does create a flat board, but I always listen for the sound of a machine as it runs. It sounds like the wood chipper I use when mulchi ng garden and tree stuff in the Fall. The cutting depth was slightly less than 1/16 inch.
Is the jointer ok or,are the blades not sharp enough or, are the adjust ment tolerances too generous?