From a functional standpoint, regardless of whether the lead is specified in inches or millimetres, both screws translate the load in exactly the same way. Similarly, a ball screw with a 25.000mm lead would mean that one revolution of the screw translates the load 25.000mm. A 1.000 inch lead on an inch-series ball screw means that the load, as attached to a nut, will travel 1.000 inch with each revolution of the screw. The unit of measure used to define this motion is then typically assigned to the ball nut as the product series. The lead of a ball screw is the linear travel that a ball nut will travel upon a single revolution of the screw. This article explains how sizing and selection questions centred on performance – instead of monikers – can lead to more efficient linear motion designs. This decision may prematurely exclude the ideal product for the application and lead to significant losses in time, labour and expense. Inch series ball nuts provide dependable accuracy and repeatability, and are ideal for assemblies designed for inexpensive, transport-grade applications
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