Keeping zero position

I find that there is enough room on the sides of the waste board that are next to the rails to make a fixture as I was suggesting above to form a corner. The one on the x axis I made removeable for those tiling situations. Since the machine will never be in the same place when it homes. The only solution to a repeatable x and y is a fixed location on the spoil board that can be probed and set each time the machine is turned on. For example for the epoxy guy who wants to make multiple pours. With this method he could actually remove the piece and let it dry and then return it to the machine when he was ready because the start position will be the same for all pieces that start in the set corner fixture.