ISO/TR 17243-2:2017 pdf free

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ISO/TR 17243-2:2017 pdf free.Machine tool spindles — Evaluation of spindle vibrations by measurements on non-rotating parts — Part 2: Direct-driven spindles and belt-driven spindles with rolling element bearings operating at speeds between 600 r/min and 30 000 r/min.
ISO/TR 17243-2 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 600 r/min and 30 000 r/min.
ISO/TR 17243-2 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 ISO 230‑7),
– unacceptable cutting performance with regards to surface finish and accuracy,
– vibration severity issues of machine tool spindles operating at speeds below 600 r/min or exceeding 30 000 r/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.
2 Normative references
ISO 1925, Mechanical vibration — Balancing — Vocabulary.
ISO 2041, Mechanical vibration, shock and condition monitoring — Vocabulary.
ISO 2954, Mechanical vibration of rotating and reciprocating machinery — Requirements for instruments for measuring vibration severity.
ISO 13372, Condition monitoring and diagnostics of machines — Vocabulary.
4 Preliminary operations
4.1 General
When measuring vibration, the operational condition of the machine tool is of great importance. This document is applicable to all normal operational conditions of the machine tool when machining.
For any spindle vibration measurement intended to characterize the spindle condition according to this document, important operational conditions should be recorded. Such operational conditions include, but are not limited to, the characteristics listed in 42 to 4.11.
When using vibration measurement results for evaluation of spindle condition, other factors contributing to or interfering with the measured signals should be taken into consideration. Such factors include spindle motor current control signals with their associated frequencies, influences of machine foundation and the position of the other moving components affecting the dynamic response of the overall system, and possible high level of scatter due to low energy content in the frequency range of interest. If such interfering signals or conditions are suspected, frequency analysis techniques can be used to differentiate bearing signals from other contributing factors.

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