1、先把絕對坐標系移到物體上，選擇物體上互相垂直的三條邊建立壹個物體坐標系並保存。
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2、把模型按照如下圖的絕對坐標系擺正（方便觀察視圖）。用下拉菜單“信息”-“對象”命令測量出作為物體坐標系的X邊的角度。（此角度為X邊投影在絕對坐標系的XCYC平面內的角度）
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3、將模型和物體坐標系壹起繞ZC軸旋轉上壹步測量的角度（或正或負）。旋轉之後X邊在XCYC平面內跟XC軸平行。
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4、將模型按下圖絕對坐標系放置（方便觀察視圖）、用“測量”命令測出X邊跟XC軸的角度。
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5、將模型和物體坐標系壹起繞YC軸旋轉上壹步測量的角度（或正或負）。旋轉後X邊跟XC軸完全重合。
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6、測量Y邊跟YC軸的角度、繞XC軸旋轉物體及物體坐標系、使絕對坐標系跟物體坐標系完全重合。
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