One idea that may work for you is clamp a piece of material to the table as near as you can get to true with the axis then run along the edge to dress it true, then you can slide your workpiece against it and clamp it and if needed remove the stop material before machining.
Logical, thanks. Maybe a piece of mdf or plastic could be fastened to the table and routhed/engraved in concentric squares, might work I'll have to have a go. Thinking about it, I suppose its only the same as using a rule, not 100% accurate but probably ok for starters.
Thanks again