This Dado set cuts like a dream. I'm doing mostly Baltic Birch ply, grooves for shelves, rabbets and half laps on an 80's radial arm saw. The measurement is easy to calculate with the super-simple graphic diagram printed with the kit (needs to laminated or something). But as with anything, cut on a test piece to get your width. I've had lumber variations all over the place, so only trust your rule and a good set of calipers.