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RKB ISO-Compliant Load Rating Capacities

RKB ISO-Compliant Load Rating Capacities
8Pages

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IN GENERAL DESIGN AND MANUFACTURE OF EQUIPMENTS, MACHINES AND RELATED ELEMENTS STANDARDIZATION HAS THE OBJECTIVE TO FACILITATE THE INTERNATIONAL EXCHANGE OF GOODS AND SERVICES, AND TO DEVELOP COOPERATION IN THE SPHERES OF INTELLECTUAL, SCIENTIFIC, TECHNOLOGICAL AND ECONOMIC ACTIVITY. DESIGNERS AND MANUFACTURERS VS NOT-COMPLYING WITH THE CURRENT STANDARDIZED REGULATIONS (WHY?) DESIGNERS AND MANUFACTURERS COMPLYING WITH THE CURRENT STANDARDIZED REGULATIONS

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ISO METHOD FOR ROLLING BEARINGS IS THE SUM OF TODAY’S UNIVERSALLY RECOGNIZED, PROVED AND STANDARDIZED KNOWLEDGE, DEVELOPMENT AND INFORMATION, THAT YIELD SATISFACTORY RESULTS (APPROPRIATE AND CONVENIENT SUBSTITUTE FOR TESTING). IN PARTICULAR MANUFACTURE OF ROLLING BEARINGS VS MANUFACTURERS OF ROLLING BEARINGS COMPLYING WITH THE CURRENT ISO STANDARDS ISO 281:2007 ISO/TR 1281-1:2008 ISO/TR 1281-2:2008 ISO 76:2006 MANUFACTURERS OF ROLLING BEARINGS NOT-COMPLYING WITH THE CURRENT ISO STANDARDS (WHY?) ROLLING BEARING PERFORMANCES AND LIFE PREDICTIONS ARE BASED ON THE REGULATIONS SET WORLDWIDE BY...

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LIKE THE MAJORITY OF BEARING MANUFACTURERS*, RKB CHOOSES TO STRICTLY FOLLOW THE STANDARDS DEFINED BY ISO FOR A RELIABLE RATING LIFE CALCULATION OF ROLLING BEARINGS**. RKB’S CALCULATIONS OF BEARING BASIC LOAD RATING CAPACITIES RIGOROUSLY APPLY THE SPECIFICATIONS DEFINED BY ISO 281:2007, ISO/TR 1281-1:2008, ISO/TR 1281-2:2008, AND ISO 76:2006 IN THEIR LATEST REVISION. THIS ENABLES RKB TO EXPLOIT BEARING LIFE POTENTIAL WITH A PROPER SAFETY INDEX, TO UNDERTAKE CONTROLLED SIZING, AND TO TAKE INTO DULY CONSIDERATION THE COMPLEXITY OF THEORY WITH PROVED CRITERIONS ON METAL FATIGUE OF ROLLING...

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FINAL RECOMMENDATIONS TO USERS EVIDENCE A - BEARING MANUFACTURERS DECLARE TO BE ISO COMPLIANT IN TERMS OF LOAD CAPACITIES AND RATING LIFE “[…] static load carrying capacity according to DIN ISO 76” (INA FAG Rolling Bearings Catalogue HR1, p. 59) “The basic dynamic load ratings are based on DIN ISO 281” (INA FAG Rolling Bearings Catalogue HR1, p. 41) “The basic static load rating as defined in ISO 76:1987 […]” (SKF General Catalogue 6000EN, p. 51) “The basic dynamic load ratings for SKF bearings are determined in accordance with the procedures outlined in ISO 281:1990” (SKF General Catalogue...

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FINAL RECOMMENDATIONS TO USERS BASIC STATIC LOAD RATING (C0) IS FUNCTION OF: Dwe = ROLLER DIAMETER i = NUMBER OF ROWS Z = NUMBER OF ROLLERS Lwe = INTERACT ROLLER LENGTH á = CONTACT ANGLE BASIC DYNAMIC LOAD RATING (C) IS FUNCTION OF: Dwe = ROLLER DIAMETER i = NUMBER OF ROWS Z = NUMBER OF ROLLERS Lwe = INTERACT ROLLER LENGTH á = CONTACT ANGLE EVIDENCE B - C0 AND C ARE FUNCTION OF THE SAME VARIABLES

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FINAL RECOMMENDATIONS TO USERS CONSIDERING EVIDENCE A AND EVIDENCE B, HOW CAN IT BE THAT DIFFERENT BEARING MANUFACTURERS HAVE VERY SIMILAR VALUES OF C0 AND GREATLY DIFFERENT VALUES OF C? BEARING MANUFACTURERS CALCULATE BOTH C0 VALUES AND C VALUES FOLLOWING EXCLUSIVELY THE ISO METHOD. ON THE CONTRARY, A FEW BEARING MANUFACTURERS CALCULATE C0 VALUES FOLLOWING THE ISO METHOD AS DECLARED*, BUT COMPUTE C VALUES FOLLOWING A DIFFERENT UNKNOWN METHOD**. 1 - MANUFACTURERS WITH SAME C0 VALUES AND DIFFERENT C VALUES * In fact, their values of C0 are similar to those of all other manufacturers ** Any...

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FINAL RECOMMENDATIONS TO USERS 2 - COMPARABLE VALUES OF C0 AND INCOMPARABLE VALUES OF C PROPER COMPARISON IMPROPER COMPARISON CALCULATED ACCORDING TO ISO METHOD CALCULATED ACCORDING TO A NON-ISO UNKNOWN METHOD C0(ISO) A FEW MANUFACTURERS C (ECS) = X • C (ISO) C (ECS) X : AN UNKNOWN EMPOWERING FACTOR WITHOUT ANY TRANSPARENT MATHEMATICAL BACKGROUND INFORMATION X : >>1 C0(ISO) C (ISO) CALCULATED ACCORDING TO ISO METHOD CALCULATED ACCORDING TO ISO METHOD RKB AND MOST MANUFACTURERS

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FINAL RECOMMENDATIONS TO USERS 3 - CONCLUSIONS RKB RECOMMENDS: 1. TO COMPARE VALUES OF C0 AND C OF DIFFERENT BEARING MANUFACTURERS ONLY IF THEY ARE CALCULATED ACCORDING TO THE SAME METHOD. 2. IN CASE A BEARING PRODUCER DOES NOT PROVIDE ANY TRANSPARENT MATHEMATICAL BACKGROUND INFORMATION FOR THE CALCULATION OF C, TO USE ONLY BASIC C0 FOR A FAIR COMPARISON BETWEEN DIFFERENT BEARING MANUFACTURERS. IN FACT, IN PRESENCE OF SIMILAR VALUES OF C0 *, THE CORRESPONDING DYNAMIC LOAD RATINGS (ISO BASED OR NOT) CANNOT NOTICEABLY DIFFER FROM MANUFACTURER TO MANUFACTURER. 3. FOR THE RATING LIFE...

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RKB ISO-Compliant Load Rating Capacities 8Pages

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RKB ISO-Compliant Load Rating Capacities
8Pages