Hi,

Re: closed-loop steppers & torque (as opposed to position) control. Viz:

https://en.nanotec.com/knowledge-bas...oop-technology

"In torque mode, the closed-loop stepper motor functions analogously to a spring, whereby the spring tension characteristic curve can be set via a potentiometer. Thus, the motor delivers a stable force, even when the motor counteracts a force while at a standstill. When the force declines, the motor begins to turn proportionally to the declining force up to the set current and torque values. Thus, closed-loop stepper motors prove ideal for any type of winding, stretching and pressing applications."

I think ClearPath have support for this application:

https://www.youtube.com/watch?v=fHPZ0lqU-80

Anyone know of any others?

Ta, Alan