机器发生故障后，其经济技术指标部分或全部下降而达不到预定要求，如功率下降、精度降低、加工表面粗糙度达不到预定等级或发生强烈振动、出现不正常的声响等。机电设备的故障分为自然故障和事故性故障两类。自然故障是指机器各部分零件的正常磨损或物理、化学变化造成零件的变形、断裂、蚀损等，使机器零件失效所引起的故障。事故性故障是指因维护和调整不当，违反操作规程或使用了质量不合格的零件和材料等造成的故障，这种故障是人为造成的，可以避免。

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