Super Smart Ball Bushing Bearing - Hollin Applications

EngineeringBall Bushing Bearing Life Expectancyand Load CapacityThere are many factors that affect Ball Bushing* bearing travellife such as 60 Case* LinearRace* hardness, the resultant load,the direction of the resultant load and Ball Bushing bearing orientation.The dynamic load capacities and travel life graphsgiven in the specification tables found in each product sectionare based on a load applied at 90º relative to the horizontalplane with the Ball Bushing bearing oriented as shown in eachcorresponding polar graph. The dynamic load capacity is alsobased on using only Thomson specified 60 Case LinearRacethat is hardened to HRC 60 minimum.For considerations other than those described above, the followingformula is used:W R =PK O •K S •K LWhere:W R = required dynamic load capacity (lb f )P = resultant of externally applied loads (lb f )K O = factor for direction of resultant loadK S = shaft hardness factor(Equals 1.0 for 60 Case LinearRace)= load correction factorK LTravel LifeThe load correction factor, K L , can be found from Figure 1. Todetermine K L , simply enter the chart with your required travellife and intersect the curve.Figure 11Figure 2Shaft Correction Factor, K S10.90.80.70.60.50.40.30.20.10Phone: 1-800-554-8466Website: www.thomsonballbushing.com60 50 40 30 20 10 0Shaft Hardness, Rockwell HRCLoad DirectionIn applications where the direction of the applied load isknown, refer to the polar graphs on the product specificationpages for the load correction factor, K O . A polar graph isreferenced in Figure 3 for example.Once you have determined your required dynamic loadcapacity refer to the product specification table for the properBall Bushing bearing size.0.7Figure 30.5K 0Load Correction Factor, K L0.40.30.20.11 10 100 1000Required Travel Life (millions of inches)60 Case LinearRace HardnessFor shafts that do not meet 60 Case LinearRace hardnessspecifications, shaft hardness factor K S must be applied. Todetermine K S , simply enter Figure 2 with your shaft Rockwellhardness and intersect the curve.SSU-10-OPNSSU-12-OPNSSU-16-OPNSSU-20-OPNSSU-24-OPNPolar GraphNote: Thomson Linear Ball Bushing bearings are precision components.To preserve bearing warranty you must use the specified Thomson 60 CaseLinearRace.Page 136©2003 Danaher Motion. Printed in the U.S.A. The specifications in this publication are believed to be accurate and reliable.However, it is the responsibility of the product user to determine the suitability of Thomson products for a specific application.While defective products will be replaced without charge if promptly returned, no liability is assumed beyond such replacement.* Trademark of Danaher Motion. DANAHER MOTION is registered in the U.S. Patent and Trademark Office and in other countries.