Linear Bearings Catalog Section - Thomson - #39

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www.danahermotion.com 51 Thomson RoundRail Linear Guides and Components Inch Ball Bearing Bushing Load/Life Graph (Lines indicate limiting load for given Ball Bushing Cartridge bearing) Determining Ball Bushing bearing Size To determine the proper Ball Bushing bearing size enter the chart with the maximum load of the most heavily loaded bearing and the required travel life. Mark where the two lines intersect. All Ball Bushing bearing sizes that pass through or above and to the right of this point may be suitable for this application. Note: For the purpose of using this chart. Load on most heavily loaded bearing = maximum applied load/K0. Where K0 can be determined from the Polar Graph to the right. 5 10 100 500 1 10 100 1000 Load on most heavily loaded bearing (lbf) Required Travel Life (millions of inches) SCB-8 & SCB-8-DD SCB-4 & SCB-4-DD SCB-6 & SCB-6-DD 10 100 1000 1 10 100 1000 Load on most heavily loaded bearing (lbf) Required Travel Life (millions of inches) SCB-8-TWN & SCB-8-TWN-DD SCB-4-TWN & SCB-4-TWN-DD SCB-6-TWN & SCB-6-TWN-DD Inch – Super Ball Bushing Bearings SCB-4 & SCB-4-DD SCB-6 & SCB-6-DD SCB-8 & SCB-8-DD SCB-4-TWN & SCB-4-TWN-DD SCB-6-TWN & SCB-6-TWN-DD SCB-8-TWN & SCB-8-TWN-DD 90 270 180 0 1.3 1.1 0.9 0.7 0.5 0.5 0.7 0.9 1.1 1.3 K0 Polar Graphs The actual Dynamic Load Capacity of a Ball Bushing bearing is determined by the orientation of the bearing or direction of the applied load. The load Correction Factor K0 is found by knowing the direction of the applied load relative to the orientation of the bearings ball tracks and referring to the polar graph. To determine the actual Dynamic Load Capacity, multiply the proper correction factor by the Dynamic Load Capacity listed in the product table on the previous page.