Dont know what machine the OP has but just when he mentioned he was thinking of 4Nm Yaskawa I presumed it was probably more than just a Boss or similar, but maybe not.
Hood
Thanks for all your valuable feedback.
Dear Hood I got two old cnc machine made by (Kirloskar Indian manufecturer) Its 10 yrs old actually the system was fitted with their proparitry hardware n now they don't support for it any more. Its been laying at my frriend factory n he was abt to retrofit it with Siemens 810 cnc ( he is in cranes and hoist manufecturing business.).
So i came up with my idea of turning this one machine into mach3 Pro CNC. And let it stand far above Siemens 810 in terms of features and performance.
This mach3 replacement has to be industrial grade so, i go with yashkawa coz its available in india.
The system integrator told me that this servo have simulated encoder o/p. That means for 2500 PPR i can have any PPR for mach3 from servo itself.
Once again thanks alot guys.