Need critical parameters of an CNC machine to monitor the health followed by how to set the threshold for each parameters.
I think that can be vibrations, radial and axial displacements of spindle.
In my experience the spindle vibration, the axial & radial movements of the each axis ie x, y, z, a & b depending upon the CNC machine specification. Apart from this the key thing is spindle rpm, servo motor current, coolant temp etc.
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