critical speed-bearings
critical speed-bearings
(OP)
How to calculate critical speed of bearings and gears?
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RE: critical speed-bearings
D<30: n = {(3 * A) / (D + 30)}* k or,
D_>30: n = {A / (D-10)} * k
A (grease lubrication)
A = 500000; in case of radial ball bearing
A = 360000; in case of double row angular ball bearing
A = 320000; in case of double row ball bearing
A = 250000; in case of double row spherical roller
A = 220000; in case of spherical roller bearing
A = 140000; in case of axial groove bearing
Oil lubrication = A * 1.25
k = 1 if F radial or F axial is smaller than 0.1*C and 0.5<k<1 if 0.4< (Fa/Fr) <100
RE: critical speed-bearings
Using ceramic balls (Si3N4) makes the critical speed of an deep groove ball bearing 30% higher
RE: critical speed-bearings
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