Motor reductions on stepper motors is almost almost always a bad idea, unless your going for resolution, dont do it. If you find some torque vs speed graphs, youll find that other than your holding torque, your only loosing speed.
If you go with the stock screws, careful tweaking will get you running around 15-20ipm. with my 272oz-in motors(same with the 162?) from automation direct, I can get 20-30ipm out of those on the stock screws.
Jon
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