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Abstract
Ball bearing slides and cross roller slides are accurate and cost-effective linear-motion devices used in positioning applications. They are similar in function, but there are several distinct differences between them. Each design has its advantages and disadvantages. A ball slide has no moving elements and requires little lubrication, but it cannot withstand severe impact or shock loads. Because rollers provide a larger contact surface than ball bearings, a cross roller slide has the capacity to carry a larger load than a ball slide of comparable size. A cross roller slide is unable to withstand shock loads. Both ball slides and cross roller slides provide smooth travel with a low coefficient of friction. Ball slides are self-cleaning, while cross roller slides are not self-cleaning and are not recommended for dirty environments. For both designs, the need for and the frequency of maintenance depend on the cleanliness of the environment.