Hey guys, I've got a general machining question.

I have a plate of material, 3/8" thick, about 5" x 5", how can I square up the edges. I do not want to machine the sides which the thicksness is measure, just the edges.

I was thinking about it earlier, and if I could get 2 edges square, then I could mount it flat, on parallels then just use the side of the end mill to square up the other edge, but the problem is getting the first two square and parallel, any tips?