Stacked Dado Sets

Using stacked dado blades would likely be the easiest and most accurate method for cutting dadoes and rabbets, particularly in plywood. While there are other types of dado blades (primarily wobble dado blades), a quality set of stacked dado blades will give the cleanest cut with edges that will be square to the foot of the cut.

Source: http://woodworking.about.com/od/bladesbits/p/StackedDadoSet.htm

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