I have a 30 year old Sears 10″ radial arm saw. It appears to me that the problems I have with accuracy are directly attributable to the table. After a period of time a new plywood (or particle board) top tends to bow down on the edges. This is because the top is only supported by two rather small rails that are located too near the middle.
I thought about various ways to provide additional support to the top, but nothing really struck me as a good solution.
Any ideas? What about buying a 18″ x 36″ x 3/8″ aluminum plate and mounting it to the rails. I could then level it and dowel the rails in place to make sure they don’t move. I’d bolt on a plywood cutting surface.