Advantages
Low friction in ball screws yields high mechanical efficiency compared to alternatives. A typical ball screw may be 90 percent efficient, versus 50 percent efficiency of an Acme lead screw of equal size. Lack of sliding friction between nut and screw lends itself to extended lifespan of the screw assembly (especially in no-backlash systems), reducing downtime for maintenance and part replacement and decreasing demand for lubrication. This, combined with overall performance benefit and reduced power requirements may offset the initial costs of using ball screws.
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—Frank Pittman (20th century)
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—Henry David Thoreau (1817–1862)