Hi,
keep turning the velocity down, velocity and acceleration are almost always the culprits when a stepper
loses steps. Keep turning it down until you find a sweet spot where it behaves. Then you have to ask the
question 'is this right...or is there another underlying fault?'. You will not be able to answer that question
until you have established that there is indeed parameters (velocity, acceleration) for which the stepper does behave.
Craig