stoutman wrote:
What is the optimum bevel angle for a jointer knife??

Do different angles work better for different types of woods??

Well now, assuming you mean a power jointer, it is basically a 'bevel
down' plane so the bevel angle doesn't affect the angle of cut, only the
clearance angle. I would fully expect anything between 25 and 35 degrees
to work just fine. A microbevel shouldn't matter, but might make it
easier to get a good edge.

OTOH, I am just theorizing, not having tried different angles on such a
machine.