Both of my tables have 1" thick tops. Believe it or not, this is not overkill. Any less than this will eventually warp. Even with 1" plate, I try to avoid tacking/grinding. I do it if I must, but usualy cut the tacks off with a sharp cold chisel. Both of my tables have I-beam frame work, six legs, and are 35" tall. One is 5'x8', one is 3.5'x14' They are easily the most important tools in my shop.
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