I'm the one that posted the original question of router versus dado blade for particle board. Thanks for all the replies. The one reply I took to heart was the one that said particle board is hard on router bits. So I used my dado blade with excellent results. The blade is a Craftsman carbide tipped oscillating dado (so you dial the width in) that I bought eons ago. It worked great. Now to assembling the whole shebang. What fun dealing with particle board that weighs a ton.