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# Simple bearing friction force calculation

## Simple bearing friction force calculation

(OP)
Hi everybody,

could anybody help me to remember hot to calculate the friction force value in a simple bearing system (a spindle in a bearing)?

### RE: Simple bearing friction force calculation

I'm not sure what bearing type your talking about.  For rolling element bearings, SKF gives coefficient of friction values.

Excerpt from SKF Interactive bearing catalog for rolling element bearings:

"Under certain conditions (bearing load P » 0,1 C, good lubrication, normal operating conditions) the frictional moment can be calculated with sufficient accuracy using a constant coefficient of friction µ from the following equation

M = 0,5 µ F d

where
M  = frictional moment, Nmm
µ = coefficient of friction for bearing (Table 1)
d  = bearing bore diameter, mm"
=============
Table 1 gives mu depending on bearing type. For example deep groove bearings without seals, mu=0.0015

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### RE: Simple bearing friction force calculation

Hi!

I wonder how to keep on with the above analyses, to the calculation of medium/big size bearing lubrification requirements, i mean to estimate the generated heat as function of F and bearing type, can we have the clearance about the essencial aspects ? Thank you?

maclean

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