Even though I work exclusively with a Shopsmith, where you could never cut anything that big I imagine it would be quite difficult with a standard table saw. I've used two methods, both of these work just fine.
1) I lay several pieces of 2" pink styrofoam insulation on the floor. Put the full size sheet of plywood on it and use a standard aluminum or a shopmade guide and my old circular saw. The guides clamp easily to the the plywood with spring clamps. (Remember good side down when cutting with a circular saw. Sometimes I score before making a cut with a utility knief if the edge is real important. )
2) Because I got tired of working on the floor, I built a framework of 2X4's that are notched to fit together that rest on standard saw horses. There are 2 pieces that connect the saw horses each 8' long and 4 pieces, each 4', that are evenly spaced at between the horses. Again, I put the plywood on the framework, use one of my guides with spring clamps and the cicular saw.
Once the pieces are to rough size I can trim them on the table saw.
I hope this is clear? Berry in St. Paul |