I have a JET Benchtop 8” Jointer/Planer combination machine. The knives
are supported by set screws to adjust the height and are spring loaded.
There are six gyb screws that hold the blade in the cutter head.
I am a bit confused as to why there are both set screws and springs. It
seems to me that the springs just complicate knife setting operations.
If I set the knives by allowing the springs to push the knives up against
a reference (e.g., a straightedge) the the set screws play no role and
are simply snugged up after the gyb screws have been tightened.
On the other hand, I can adjust the set screws and then push the blade
down against the set screws as I tighten the gyb screws. Following this
I can check my work using a dial indicator. But this makes no use of the
I am tempted to remove the springs next time I adjust the knives as they
just seem to complicate things. Any thoughts on this idea?