I like using the incra IBox jig with the Freud box joint cutter set (XBOx8). Lots of good options already presented. The jig is $130 or so, the blade is just under $100. Not cheap, but then good ain't cheap and cheap ain't good. You could use your dado set and make a jig--but that's fraught with its own issues.
I bought these for making a bunch of drawers of half inch Baltic Birch ply. In figuring that out, I came to see that blades are not necessarily 1/8th, and a stack of blades might be an odd dimension, and that cheaper dado sets might not produce a flat bottom. Given that, I think the IBox jig is a very sensible tool that adjusts to the stack size and makes box joints easier.
I also think that if I were going to make quarter inch thick boxes, I'd want to make it out of resawed, thicknessed hardwood.
The more I do, the less I accomplish.
Last edited by DesertRatTom; 12-24-2017 at 02:03 PM.