Table 3.

Simulation of fault occurrence.

Case 1. The excessive dimension error of the spindle parts	Implementation: During spindle production, a part with the incorrect dimensions was assembled at the spindle.
Case 2. Unbalanced spindle	Implementation: Attach a 5 g screw to the rotor of the spindle to create an imbalance in the spindle system.
Case 3. Damage to the bearing of the spindle	Implementation: Place a abrasion bearing retainer that presents a workable bearing inside the spindle where embedded fault diagnosis is installed.