ok lets clear this up then

machine head



sem servo motor at the back, with air feed power draw bar at front



and again motor at the back and power draw bar at the front.
on the end of the sem servo motor is a pulley which connects to a the spindle via a belt




so as ive said the plan would be to remove the sem motor and replace with a Chinese 2.2kw or 3kw motor
I would make a custom pulley to go on the end of the new Chinese motor so that it can be connected to the belt and drive the spindle and keep the atc

does that make sense now?