I had an accident with my dado blade yesterday. I set up the dado to cut a test. As it turned out, I did not tighten down the retaining nut tight enough, so when I ran my short test cut, I heard this unusal sound and thought I had the blade too high and lowered it and made another cut. Once I was done with the test dado cut, I noticed the dado cut had several ridges in the bottom. I then looked at the dado blade and saw that the chippers had shifted and on closer inspection, the chippers had collided with the left side outer blade and several carbide teeth were sheared off or damaged. Fortunately the only damage was to the dado set.
I guess I am in the market for another dado set.
With my regular combination blade, I have been turning the nut to firm up against the blade and then giving it a good firm tap. This seems to work with a single blade. I used the same with the dado turning ensuring none of the teeth are touching and the chippers are at 90 degrees to each other, but this is tightening method is not very precise and I may not have gotten it as tight as usual. Given the number of blades in a dado set, there are more chance of not seating the blades parallel and tightly, so tightening the nut as usual may have only shifted the blades over and not tighten as much as necessary.
What is your process for mounting and tightening your single blades and dado blades?