This document provides information on how to assess the severity of machine tool spindle vibrations measured on the spindle housing. It gives specific guidance for assessing the severity of vibration measured on the spindle housing at customer sites or at the machine tool manufacturer’s test facilities.
Its vibration criteria apply to direct-driven spindles and belt-driven spindles intended for stationary machine tools with nominal operating speeds between 600r/min and 30000r/min.
It is applicable to those spindles of the rolling element bearing types only, to spindles assembled on metal cutting machine tools, and for testing, periodic verification, and continuous monitoring.
It does not address
geometrical accuracy of axes of rotation (see ISO230‑7 ),
unacceptable cutting performance with regards to surface finish and accuracy,
vibration severity issues of machine tool spindles operating at speeds below 600r/min or exceeding 30000r/min (due to lack of supporting vibration data and limitations in many vibration measurement instruments), or
frequency domain analyses such as fast Fourier transform (FFT) analyses, envelope analyses or other similar techniques.
Annex A presents an introduction to alternative bearing condition assessment techniques.