Q: I can never get my dado cuts to be flat on the bottom. Is there a type of stacked dado blade that is superior to what I use now? It just never ends up flat.

A: Table saws are great for making dados, but even with a stacked (as opposed to wobble-type) bit, they don't leave an absolutely flat bottom groove. This is because the outermost cutters of the dado set have a slightly larger radius than the inner chippers. On the other hand, routers can produce a perfect dado, but they usually require several passes to get to the required depth. You can combine the two approaches to get both speed and accuracy. Simply cut the dado about 1/16 of an inch shallower than intended on the table saw, then take a quick, light pass with the router to clean up the bottom.

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