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A device that provides guidance for an item traveling in a linear direction is a linear guide. Ball bushing bearings, roundWay bearings or plain bushings assembled on round shafts are called "round rail linear guides". Round rail linear guides can be end supported or continuously supported.
End supported round rail linear guides are for use as gantry style or ‘bridge’ applications.
Continuously supported linear guides are best for applications
with concerns for shaft deflection or that have high loads. Unlimited travel lengths are possible without concerns for machined reference edges or butt joint alignment.