Ballscrews are for rapid motion and low backlash. Acme lead screws are actually extremely high in resolution because of the higher thread count per inch.
For example, if your stepper motor is set at full step, that's 200 steps per motor revolution. A Ballscrew with 5 turns per inch will give very fast motion and 200 X 5 or 1000 steps per inch. That's a resolution of .001.
The same setup with a 20 TPI Acme leadscrew would be slower in motion, but have 4 times the resolution because there would be 200 X 20 or 4000 steps per inch.
The disadvantage of lead screws is that they WEAR so fast and have to be tightened and adjusted frequently. Then the wear over time happens at the point of most use.
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