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The 2-1 Rule and How to Define Fixed/Floating Bearings

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Learn more at drylin ® R drylin ® R linear 03 series plain bearings are self-aligning and offer great advantages in applications with parallel shafts. They are able to compensate for alignment and parallelism errors and should be used on the shaft furthest from the drive mechanism. The design provides a raised spherical area on the outer diameter of the aluminum adapter for self-alignment. Load capacity is the same as the fixed version. Even in unfavorable edge-load conditions, the load is supported by the entire projected surface. In order to compensate for parallelism errors between two shafts, the outer diameter is designed to be smaller than the housing bore diameter by 0.2 - 0.3 mm depending on size. With the use of mounted O-rings, these bearings have an elastic bearing seat. Compensation for angle errors Series RJUI/RJUM/OJUI/OJUM-03 ± 0.5º Series RJUM/-06-LL/OJUM-06-LL ± 3.5º Compensation of parallelism errors Series RJUI/RJUM/OJUI/OJUM-03 ± 0.1 mm (0.004") Series RJUM-06-LL/OJUM-06-LL ± 3 mm (0.12") Self-aligning drylin ® R-06-LL bearings can compensate for errors up to ± .12" (3mm) drylin ® R-03 bearings can compensate for parallelism errors using o-rings Spherical drylin ® adapters can compensate for alignment errors Floating bearing tip: Always float towards the other rail. drylin ® T shown as example only Horizontal mounting version with floating bearing in the Y direction and lateral mounting carriage Installation variation lateral with floating bearing in the Z direction Installation variation horizontal with floating bearing in the Z direction

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