Stepper motors rotate – but how do they move things in a straight line? The answer is a lead screw mechanism. In this video, we break down how an external drive nut and screw threads convert rotary motion into precise linear movement. You'll learn why smaller thread angles mean higher accuracy, and why lead screw stepper motors are a compact, self-locking solution for linear applications. We also cover key selection tips: load capacity, speed, and accuracy. Perfect for mechanical engineers and automation enthusiasts.