My question is why do you want such hi resolution encoders, if you put a 4096 p/rev encoder on a 4mm ball screw and the encoder was used quadrature for 4096x4 = 16,384 counts/rev, on the end of that ball screw you would have a resolution of .9 to -10 The other thing to consider when going very high resolution is the capability of the control to read the count frequency at the desired feed rate.
If you had the encoder on the end of any gear/belt reduction the count frequency etc will be even higher.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.