Hi,

Thanks, it is was designed mainly for stiffness. I used there Tr 14x4 (it is ACME thread 14 mm diameter and 4 mm pitch) and only 0.8 Nm motors. It is not very fast. So I decide to put relative small feed (1m /min) and try to achieve biggest stiffness that can be achieve in that kind of construction. Result is quite good for me

Br,
Kazik