In article , Joe Wilding
wrote:

So now when I run a full width
board through., it leaves two raised bumps about 0.020 thick. I am pretty
sure that I can remove them through a sharpening, but it sucks anyway.

Can you offset the blades so that the notches don't line up? If so,
then the other blades will remove the notches left by the other blades.

Kevin