Vibration-related mechanisms
Machining vibrations - How can they be identified and addressed

It is possible to highlight a number of characteristic behaviours, which we illustrate here mainly for milling.

• Negligible vibration

  The tool path is precisely followed by the machine, and only the marks of the passage of the spaced teeth from the feed to the programmed tooth can be seen on the machined surface (figure 10a).

• Vibrations in phase with tooth impact

  When the stiffness of the machine-tool-workpiece system is insufficient, the cutting force undergoes periodic variations, creating noticeable vibrations, known as forced vibrations.

  As these vibrations are, to a first approximation, at the same frequency (or multiples) as the tooth passage, the surface finish is virtually the same as before,...