Compute the required basic dynamic load rating, C for a ball bearing to carry a radial load of 650 lb from a shaft rotating at 600 rpm that is part of an assembly conveyor in a manufacturing plant.

Question

TABLE 14_4 Recommended design life for bearings

Application	Design life [latex]L_{10}[/latex],h
Domestic appliances	1000-2000
Aircraft engines	1000-4000
Automotive	1500-5000
Agricultural equipment	3000-6000
Elevators, industrial fans, multipurpose gearing	8000-15 000
Electric motors, industrial blowers, general industrial machines	20 000-30 000
Pumps and compressors	40 000-60 000
Critical equipment in continuous, 24-h operation	100 000-200 000

Accepted Answer

From Table 14_4,

Application	Design life [latex]L_{10}[/latex],h
Domestic appliances	1000-2000
Aircraft engines	1000-4000
Automotive	1500-5000
Agricultural equipment	3000-6000
Elevators, industrial fans, multipurpose gearing	8000-15 000
Electric motors, industrial blowers, general industrial machines	20 000-30 000
Pumps and compressors	40 000-60 000
Critical equipment in continuous, 24-h operation	100 000-200 000

let's select a design life of 30 000 h. Then [latex]L_{d}[/latex] is [latex]L_{d}=(30000 \mathrm{~h})(600 \mathrm{rpm})(60 \mathrm{~min} / \mathrm{h})=1.08 imes 10^{9} \mathrm{rev}[/latex] From Equation (14_3), [latex]C=P_{d}\left(L_{d} / 10^{6} ight)^{1 / k}[/latex]

[latex]\mathrm{C}=650\left(1.08 imes 10^{9} / 10^{6} ight)^{1 / 3}=6670 \mathrm{lb}[/latex]

Question 14.EP.2: Compute the required basic dynamic load rating, C for a ball...

Related Answered Questions