Frequently Asked Question

How do I troubleshoot the source of vibrations during machining?
Last Updated 3 months ago

The machining process excites one of the flexibilities that exist on the tool/machine tool or workpiece/fixture side. Each flexibility has a natural frequency and associated mode shape (i.e. how the structure behaves during vibrations).

The following procedure can be used to identify the source of the flexibility and weak joint on the machine/tool – fixture/workpiece set up:

1) Conduct a chatter test and measure the vibration using microphone or accelerometer. Use a new CutPro Data Acquisition Cutting Test workspace and enable the continuous data logging mode.
2) Apply FFT (Fast Fourier Transform) using Data Acquisition’s FFT button (located on the plot toolbar) where the chatter is evident with large amplitudes. Identify the chatter frequency and record it.
3) Conduct impact hammer tests on the cutting tool mounted on the spindle using CutPro Tap Testing. Check the natural frequencies from the Magnitude of the measurement. If the natural frequency of the tool measurement is very close to chatter frequency, the chatter is caused by the machine tool or cutting tool assembly.
4) Conduct hammer tests on the workpiece mounted on the fixture using CutPro Tap Testing. Check the natural frequencies from the Magnitude of the measurement. If the natural frequency of the workpiece measurement is very close to chatter frequency, the chatter is caused by the workpiece, fixture or clamping.

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