Abstract
An investigation into the variation of the coefficient of friction during stick-slip sliding of a machine tool carriage is reported. The errors of position induced by the oscillation at feed speeds approaching zero, and at the critical speed when the oscillation amplitude is at a maximum, were measured and the results are given in a non-dimensional empirical relation which includes the effect of system natural frequency and feed speed. The amplitudes of the errors during sliding are shown to remain substantially constant at feed speeds below a critical value for any given machine configuration. At speeds above the critical the oscillations are rapidly damped out. The value of the critical velocity is shown to be a function of bearing pressure. The magnitude of the errors is seen to depend on the system natural frequency, there being a rapid rise in errors with system natural frequencies below about 60 rad/s.
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