Torque control is used to achieve constant force / torque. It can be set by digital or analog signals. This video covers the digital input setup.
I did a modification of the juice press I made last year. It was kind of working but that was not what I was expecting. Recently I decided to modify the drive from stepper motor and belt to AC servo with a 1:30 reducer. Now with about 72Nm on the screw it works great, maintaining a constant pressure. This project is now finished.
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