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Many years back, some number of companies produced a special blade that could cut dados with just a single blade. The invention was really pretty cool, but simple. The single blade would have to rotate a bit on it's axis which would mean that it could plough out a trough of wood, depending on how far the blade was turned. When it was not turned I would carve out a slot approximately 1/8 inch wide, but when it was turned fully it could make a dado cut that was well in excess of 3/4 inch. These blades were called wobble wheels and were quite common at one time. I am not sure if they are still made and I have not been able to find a source for them in recent years.
Like all things that change, the wobble wheel has all but gone away, replace instead by the stack dado set which consists of a couple of outer cutting blades and sandwiched between them are something called chippers, and together they are used to dado cuts of varying widths, depending on how many chippers are installed.
I used a wobble wheel for many years and always found to make decent cuts, my only real complaint was it often took a lot of time getting the width the perfect size. Over the years I have heard (but never actually tested) from many people, that wobble wheels, because of their design create somewhat coved bottoms on the dado cuts. Based on how the blade works, it's pretty easy to assume this would of course be the case, but how much of a cove does it make and does it really make any difference? That's what I set out to see ...