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One of the great things about woodworking is that there are often more than one way to accomplish things. This fact is true with setting jointer knives. There is really only one rule in setting jointer knives and that is NEVER let the knives fall below the height of the out feed table.
When this happens, when you joint wood, instead of your wood being nice and straight and flat, it will be flat but will come out "arced", and the lower the knives are from the out feed table the more exaggerated the arcing will be. This of course makes it impossible to glue boards together, or in many case to even connect your wood together because is will leave gaps.
One of the tried and true methods I was taught many, many years ago was that when setting jointer knives the correct height is when you lay a ruler on the out feed table and slowly turn the jointer knives by hand, the knives will grab the ruler lift is slightly and move it ahead by about 1/8". This leave a very time amount of snipe in the board (snipe is that small depression that jointers and planers can leave a the very end of boards).