Next part I'm looking into is a servo to drive the head of this planned DIY milling machine.

Requirements are:
Milling head is ~40kg
Driven by 5mm ballscrews
Running on 20mm linear rails
Total head travel is about 350mm and I'd like to cover this in 5 seconds max under rapids
Pulley ratio 3:1

This AC servo seems OK:
https://www.omc-stepperonline.com/a6...-rs750h2b1-m17
Click image for larger version.  Name: AC_servo_750W_3000rpm.jpg  Views: 31  Size: 261.1 KB  ID: 32714

750W
integrated brake
2.39Nm torque, 8Nm peak
Mains powered servo driver
Accepts pulse step/direction (I'll be running it from an ESP32 microprocessor since it does lots of other things as well)

I need to use this for drilling as well by moving the head down. My calculations show the axial force from the servo and ballscrew is 1607N peak, along with some of the mass of the head backdriving the ballscrew so this seems OK to me.

Does anyone have any experience with these AC servos, and any comments on the above requirements?
They also do an ethernet version (more money) but I don't know if I can interface to that from my microcontroller so am looking at the usual step/direction pulse control. I'll probably need electronic gearing too.

Thanks