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Bearing friction equation?

  1. Mar 7, 2010 #1
    I am familiar with the basics concept of kinetic friction (such as pushing a box on a surface), but how do you calculate the friction torque caused by a bearing for example?

    In my college assignment, I have been told the bearings in a winding drum have a coefficient of friction of 0.04 (bearing size 200mm OD). The drum is 2.5m OD, and I know the load force on the outside of the drum (lets call it F). The torque caused by the load on its own is 1.25*F. Is the torque caused by the bearing friction therefore ((1.25*F)/0.1)*0.04?

    I hope this made some sense...

    Any help at all would be appreciated.
  2. jcsd
  3. Mar 7, 2010 #2


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    check your units ... I think you have a Force there, not a torque.
    what Force would it be?
  4. Mar 7, 2010 #3
    Friction force? :confused:
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