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If you work with an aircraft, use power steering, use machine tools, create robots, or create missiles you have likely used ball screws. Ball screws allow for rotational motion to convert into linear motion with little amounts of friction. Ball screws are made with close tolerances due to the low levels of friction needed, so they are often used in items that need high-precision parts.
Because of the low amount of friction, ball screws allow for a high level of mechanical efficiency to be achieved. However, ball screws are more expensive than others, such as the Acme lead screw.
You can purchase ball screws from a number of companies, including Thomson, Rockford, and Nook ... more