Hey, Big Guy. You can use just about anything for a fence. Some have used a 2x4 clamped to the table. The reason most use MDF, melamine or plywood is that they are reasonably flat (square) and ridgid and will not warp like a chunk of solid wood. The main things are, it needs to be square to the table and not flex. If the oak isn't smooth enough for you just face it with some formica or even a good coat of wax will help.
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George
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