Hi Mark,

late reply, I forgot about this thread;)

You guessed it, it is a bit commercially sensitive, hence the rather limited details. Main questions I wanted to focus on where:

- if a stepper can be used as a driver for a shaft at low speeds and low loads

- how one calculates needed torque for a stepper, knowing what the downward pull / load would be

uC is a microcontroller, so basically like a PIC, Atmel or an Arduino.

Regards,
dsc.