Microstepping

The relationship between step sizes and back-driving force is not steady, where the smaller step sizes like 1/32 and 1/16 as well as the larger steps (full and half) withstand less force the the mid-ranged step sizes.  There is a 'threshold' of force that the motor can withstand before it gets very easy to push backwards. An interesting fact occurs when the delay goes below 0.1 millisecond for step sizes larger than 1/8, the motor will not rotate straight away, it requires a little pull in the positive direction. I searched online trying to find a solution to improve the performance, however there seems to be no one trying to use a stepper motor in my application. I am now looking into the programming side seeking for solutions. I have successfully programmed the controller so the direction of motion of the motor can be controlled by the load.