What size servo motor do I need.

[routercnc]

Hi Jonathan,

Useful thread thank you. When I saw the title I thought this was something special relating to servo motors, but upon reading it is about motors in general so I wonder if 'what size stepper do I need'. would be more helpful to people? Good work anyway.

The torque output from the calculation is at a certain acceleration and feedrate. I there a way someone deciding on a motor can estimate the how the static torque quoted in spec sheets drops at the required speed above so they can compare to the torque required calculation? Or is it sufficient for someone to just apply a safety factor, say 2 or 3?