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機器發生故障后，其經濟技術指標部分或全部下降而達不到預定要求，如功率下降、精度降低、加工表面粗糙度達不到預定等級或發生強烈振動、出現不正常的聲響等。機電設備的故障分為自然故障和事故性故障兩類。自然故障是指機器各部分零件的正常磨損或物理、化學變化造成零件的變形、斷裂、蝕損等，使機器零件失效所引起的故障。事故性故障是指因維護和調整不當，違反操作規程或使用了質量不合格的零件和材料等造成的故障，這種故障是人為造成的，可以避免。

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