I understand that the strength of plywood depends on the size of the piece along with the amount of layers. Does anyone know any formulas or webpages that would help me find how much of a vertical load that plywood would hold.

I ask since I am making a cabinet for my new edge sander and I have alot of 1/2" laying around and want to use it but I want to be sure that it will hold the 200# sander and other stuff. I'll proabibly make the base have drawers so there is another good 100-200#'s of weight to hold. I have no problems using 3/4" but I'm more curious of my options. I'll be placing all of the load onto casters so I can move it around too.

thanks
Brian