Irving
We both have the same answer ?
200 steps per motor rev times how many micro steps divided by the pitch.

Anyway 160 is the correct answer.

You gave this advise to Kamo the other day

"8mm threaded rod is 1.25mm pitch so one rev of the motor = 1.25mm movement. The motor has 200steps/rev so 1 full step = 1.25/200 = .00625mm and if it 1/8 microstepping 1 microstep = .00625/8 = .00078125mm which is 1280 steps/mm"

So try 200 x 8 /1.25 it equals 1280 which is what you got, just easier maths.