Hi CNC - For the Y Axis you went in rough terms from 1N/um to 8N/um which is quite good. So you got 8x not 10x.. For the X axis its my guess the new frame is poor in torsion. Its an open section, effectively a C channel which has poor torsional stiffness. Very good bending stiffness in its two principle dirns but torsion no good. Close the back with a sheet like the front and it will improve considerably... Regards Peter
I did the X axis and yes the improvement was small from 2.6N/um to 3.7N/um. (1um = 0.001mm) torsion is tough gig to get right.... interesting your curves droop. They usually strain stiffen. May mean you need a little maintenance somewhere...