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Techno Linear Motion Catalog 47 Technical Information Combined Loading Capacity Usable Life The actual life expectancy achieved by a linear guide is known as usable life. The usable life can deviate from the calculated life expectancy. These conditions can lead to early defects: - alignment error between guide rails or guide elements - insufficient lubrication - oscillatory motion with very small strokes (rippling) - vibration during standstill (rippling) Due to the variation in installations and operating conditions, it is not possible to determine the exact usable life of a linear guide in advance. The safest method to obtain a correct assessment of the usable life is to compare cases with similar installations. When the loading direction of an element does not coincide with one of the loading directions, this is the way the equivalent load is calculated as follows: P =  F1  +  F2 for a force F and a moment M at the same time, the dynamic equivalent load is: P =  F  +  M  x P [N] dynamic equivalent load F [N] applied force =  Ö   F1 2 + F2 2 F1 [N] vertical components, see sketch (4) F2 [N] horizontal components, see sketch (4) C0 [N] static load in the direction of the applied force M [Nm] applied moment M0 [Nm] static moment in the direction of the applied moment According to DIN standards, the dynamic equivalent load should not exceed the value P = 0.5 x C. H [m] single stroke length n [min] number of complete strokes per minute v [m / min]  average travel speed (4) F2 F1 F C0 M0 (5) (6)     1270.0       750.0     1270.0       750.0     1270.0      750.0        22.0        12.6        12.6        13.5          7.5          7.5 ZF1 ZF1 ZF2 ZF2 ZF3 ZF3   Model BL1 BL3 bearing roller bearing roller bearing roller carriage carriage carriage carriage carriage carriage    Co [N] 3061.5 4701.7 3061.5 1440.7 4701.7 1440.7        4701.7        1440.7     C  [N] 1598.1 2127.7 1598.1       2668.0 2127.7 2668.0        2127.7        2668.0 F1 stat  [N] 2648.0 4060.0 2648.0       2881.4 4060.0 2881.4        4060.0        2881.4 F1 dyn  [N] 1382.7 1840.3 1382.7       2531.9 1840.3 2531.9        1840.3        2531.9 F2 stat  [N] 3061.5 4701.7 3061.5       1440.7 4701.7 1440.7        4701.7        1440.7 F2 dyn  [N] 1598.1 2127.7 1598.1       2668.0       2127.7       2668.0        2127.7        2668.0 Mx stat [Nm] 37.2 175.0 37.2           80.8 175.0 164.7          175.0          164.7 My stat [Nm] 98.8 151.8 98.8         129.7 151.8 201.7          151.8          201.7 Mz stat [Nm] 114.3 175.5 114.3           64.8 175.5 100.9          175.5          100.9 Mx dyn [Nm] 19.4 79.2 19.4           71.0 79.2 144.7            79.2          144.7 My dyn [Nm] 51.6 68.7 51.6         113.9 68.7 177.2            68.7          177.2 Mz dyn [Nm] 59.7 79.4 59.7         120.1 79.4 186.8            79.4          186.8 Load and Moment Data (reference diagram on next page) NP1 belt slide