Rye CNC Router upgrade (w Picture) - Agors

[m_c]

You need to do a bit reading up about servo and stepper motors.

Those servo motors you've removed, are 1.2Nm continuous stall, and will deliver that torque all the way to it's maximum speed of 5000RPM. They also have a higher instantaneous/peak torque, which gives you a boost for fast acceleration.

Stepper motors on the other hand, only produce the rated torque at zero speed. As you increase speed, torque drops of very quickly.
I couldn't find a speed/torque diagram for those HSS steppers, but Leadshine have one published for their similar motor -


Running with a 70VDC supply, torque has dropped to around 1Nm at only 2400rpm, so you have under half the performance of the servo motors you've removed at continuous torque, and probably under 20% once you factor in the instantaneous torque available with the servo, which is where servos excel over steppers.

Those servos you've removed are around the 600-750W power, however you'll struggle to get modern AC servo motors that spin to 5000 (one major benefit of DC motors, is you can spin them very fast with primitive technology!).