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.

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Accepted Answer

From Table 14–4, let’s select a design life of 30 000 hours. Then [latex]L_d[/latex] is
[latex]L_d = (30 000 h)(600 rpm)(60 min/h) = 1.08 × 10^9[/latex] rev
From Equation (14–3),[latex]C=P_d(L_d/10^6)^{1/k}[/latex]

[latex]C = (650 lb)(1.08 × 10^9/10^6)^{1/3} = 6670[/latex] lb

TABLE 14–4 Recommended Design Life for Bearings
Application	Design life [latex]L_{10}[/latex], h
Domestic appliances, instruments, medical apparatus	1000–2000
Aircraft engines	1000–4000
Automotive	1500–5000
Agricultural equipment, hoists, construction machines	3000–6000
Elevators, industrial fans, multipurpose gearing, rotary crushers, cranes	8000–15 000
Electric motors, industrial blowers, general industrial machines, conveyors	20 000–30 000
Pumps and compressors, textile machinery, rolling mill drives	40 000–60 000
Critical equipment in continuous, 24-h operation; power plants, ship drives	100 000–200 000

Question 14.2: Compute the required basic dynamic load rating, C, for a bal...

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