Originally Posted by irving2008  I dont know how thick the z-plate on freff's design is, and I agree the design increases the turning moment on the rails, but when I did the calculations for mine I found there was more deflection due to bending in the planned 6mm thick alu z-plate due to sideways cutting forces when the tool was at its lowest Z extension than in the 20mm end-supported Y-rails themselves... |
That's good to know.
If his plate has flex, an easy fix is to put a couple of ribs on the plate, say the same thickness and 1/2-3/4 " wide.
I think I would run it as it is and see how it goes since it is already built.
All in all it looks quite sturdy and should serve him well.
Mike.