Guiding Values of Basic Bearing Life Lh [hours]
Type of machine | L h [hours] |
Instruments and tools seldom used | 1000 |
Electrical household machines, small fans | 2000 - 4000 |
Machines for intermittent operation, hand tools, workshop cranes,agricultural machines | 4000 - 8000 |
Machines for intermittent operation with demands for high reliability: auxiliary machines in power stations, belt conveyors, transport trucks, elevators | 8000 - 15000 |
Rolling mills | 6000 - 12000 |
Machines designed for 8 to 16 hours operation: stationary electric motors, gear drives, spindles of textile machines, machines for processing plastics, cranes | 15000 - 30000 |
Cutting machines generally | 20000 - 30000 |
Machines for permanent operation: stationary electric machines, transport equipment, roller beds, pumps, centrifuges, blowers, compressors, hammer mills, breakers, briquetting presses, mining elevators, rope disks | 40000 - 60000 |
Machines for permanent operation with high operating safety: paper machines, power stations, water works, ship machines | 100000 - 200000 |