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| | | • Life Span | | |
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| | | Lh 2 n^60 | | |
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| | | Lh : life span | | (h) (mm) | | |
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| | | l | | : stroke length | | |
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| | | : number of forward and reverse motions per minute (min1) | | |
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| | | I | | : ball screw's lead | | (mm) | | |
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| | | f ■ contact factor | | |
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| | | If two nut blocks are used in a double block on model KR-B/D, multiply the basic load rating by the contact factor shown in Table 4. (Table 4) Contact Factor (fc) | | |
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| | | | | | | | | | Type of Nut Block | Contact Factor fc | | | | Types A/C | 1 | | | | Types B/D | 0.81 | | | | | | | | | |
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| | | fW: load factor | | |
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| | | (Table 5) Load Factor (fw) | | |
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| | | | | | | | | | | Vibration or Impact | Velocity (V) | fw | | | | Minute | For crawling VS0.25 m/s | 1 to 1.2 | | | | Small | For slow speed 0.25<VS1 m/s | 1.2 to 1.5 | | | | Medium | For intermediate speed 1<VS2 m/s | 1.5 to 2 | | | | Large | For high speed V>2 m/s | 2 to 3.5 | | | | | | | | | | |
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| | | K: moment equivalent coefficient (LM guide) If traveling is performed with moment applied, the load-carrying distribution of the LM guide increases locally. In this case, multiply the moment value with the moment equivalent coefficient shown in Table 6 to calculate the load. KA, KB and KC show the moment equivalent coefficient in the MA, MB and MC directions, respectively. (Table 6) Moment Equivalent Coefficient (K) | | |
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| | | | | | | | | | | | Model | Ka | Kb | Kc | | | | KR15-A | 3.2x10-1 | 3.2x10-1 | 9.09x10-2 | | | | KR15-B | 5.96x10-2 | 5.96x10-2 | 9.09x10-2 | | | | KR20-A | 2.4x10-1 | 2.4x10-1 | 7.69x10-2 | | | | KR20-B | 4.26x10-2 | 4.26x10-2 | 7.69x10-2 | | | | KR26-A | 1.73x10-1 | 1.73x10-1 | 5.88x10-2 | | | | KR26-B | 3.06x10-2 | 3.06x10-2 | 5.88x10-2 | | | | KR30H-A | 1.51 x10-1 | 1.51 x10-1 | 4.78x10-2 | | | | KR30H-B | 2.76x10-2 | 2.76x10-2 | 4.78x10-2 | | | | KR30H-C | 2.77x10-1 | 2.77x10-1 | 4.78x10-2 | | | | KR30H-D | 3.99x10-2 | 3.99x10-2 | 4.78x10-2 | | | | KR33-A | 1.51 x10-1 | 1.51 x10-1 | 4.93x10-2 | | | | KR33-B | 2.57x10-2 | 2.57x10-2 | 4.93x10-2 | | | | KR33-C | 2.77x10-1 | 2.77x10-1 | 4.93x10-2 | | | | | | | | | | | | | | | | | | | | Model | Ka | Kb | Kc | | | | KR33-D | 3.55x10-2 | 3.55x10-2 | 4.93x10-2 | | | | KR45H-A | 9.83x10-2 | 9.83x10-2 | 3.45x10-2 | | | | KR45H-B | 1.87x10-2 | 1.87x10-2 | 3.45x10-2 | | | | KR45H-C | 1.83x10-1 | 1.83x10-1 | 3.45x10-2 | | | | KR45H-D | 2.81 x10-2 | 2.81 x10-2 | 3.45x10-2 | | | | KR46-A | 1.01 x10-1 | 1.01 x10-1 | 3.38x10-2 | | | | KR46-B | 1.78x10-2 | 1.78x10-2 | 3.38x10-2 | | | | KR46-C | 1.85x10-1 | 1.85x10-1 | 3.38x10-2 | | | | KR46-D | 2.5x10-2 | 2.5x10-2 | 3.38x10-2 | | | | KR55-A | 8.63x10-2 | 8.63x10-2 | 2.83x10-2 | | | | KR55-B | 1.53x10-2 | 1.53x10-2 | 2.83x10-2 | | | | KR65-A | 7.55x10-2 | 7.55x10-2 | 2.14x10-2 | | | | KR65-B | 1.35x10-2 | 1.35x10-2 | 2.14x10-2 | | | | | | | | | | | |
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| | | (Note) For model KR-B/D, the moment equivalent coefficient is the value when two nut blocks are used in a double block. | | |
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| | | 10 | | |
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