My first 700 x 500 x 300 Mill/Router machine

[Lovre]

Read some of these:
TB6560 - Google Search

The short answer is it can only safely drive the motors at a very low voltage (24V), so you will get far less torque from the motors than if you used better drivers. Which motors did you get?

I was reading some of this threads, but it seemed to me that it should not be such a problem.

At 24 volts my steppers can make X axis 3Nm, Y axis 1,9 Nm, and Z axis 1,3 Nm. I thought that it would be enough, but maybe I must make calculations.