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Many many years ago I purchased a Wobble Wheel Dado Blade. For those of you who do not know this blade, it is an interesting invention where a single blade is mounted in housing that when you turn the housing base, it offsets the wheel in stead of running true. The more you offset the blade the wider the dado it will cut. The blade works fine, although mine seems to be a bit sticky and harder to move in recent years. I have also heard many people who don't like wobble wheel dado blades, explaining that the blades don't give perfectly flat bottom dados because of their design, the bottoms are slightly convex or hollowed.
If you check out the previous video I did on this, you can see that ... yes, there is ... barely a dip in the dado cuts, but honestly, I think in most situations this would be more than acceptable for most people. I also have a stacked dado blade set that I use most often, mostly because it is more accurate for cutting size of dados I need.
Personally, my only real complaint with wobble wheel dado blades is that in order to get a snug fitting dado, you need to fiddle around with them setting, testing, re-setting and re-testing. All this takes time and I have always thought it would be nice to have some sort of a jig that I could use that I could set the blade width before putting it into the table saw, that would be accurate and give me the kinds of dados I want.