The paper presents a way of estimation, by simulation, of friction forces that occur in the kinematical joints of mechanical systems. Friction forces between planar surfaces, in revolute joints, and in spherical joints are computed, and the results are compared with the values achieved from simulation. SolidWorks software is used for the simulation process.

The paper presents experimental determination of the friction coefficient variation at a radial plain bearing, depending on the values of the radial force R and the angular speed ω of the spindle at a constant lubricant temperature value.

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