Couldn't follow your calculations. Looks like my maths is just as bad. This is the way I do it.
1 inch = 25.4 rev (tpi 25.4)
1 rev = 2000 steps (1/10 microstepping)
so 1 inch 25.4 rev x 2000 steps/rev
1 inch = 50800 steps
50800 steps = 1 inch
so 1 step = 1/50800 inch
1 step = 0.000019685 inch
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Another way to look at it
25.4 rev = 1 inch
1 rev = 1/25.4 inch = 0.03937 inch
1 rev = 2000 steps = 0.03937 inch
so 1 step = 0.03937/2000 inch =0.000019685 inch |