自检互检，确保产品零缺点！
每个工作班的每个工人（或操作小组）加工完的首件需进行自检、互检和专检。
The first piece machined by each worker in every group (the operating group) needs to inspect by themselves, or by the other , and by the specialist (three types of inspection).
介绍了工厂对大尺寸直角尺精度检测与修复常用的在平台上三直角尺两两互检的方法与原理。
This article introduces the common method and principle about the accuracy test and repair of big-size square rulers by checking each other with three square rulers on platform in factories.
我国目前主要仍采用长平晶组分段互检方法作为直线度检定基准，测量精度不高(特别是在测量大尺寸零件时尤为明显)。
At present, long optical flat is still mainly adopted as calibrating benchmark in straightness measurement, whose accuracy is not so high (especially in measuring great-size parts).
介绍了工厂对大尺寸直角尺精度检测与修复常用的在平台上三直角尺两两互检的方法与原理。在确定直角尺误差时，该方法的缺点是需要逻辑推理，较难掌握，功效较低。
This article introduces the common method and principle about the accuracy test and repair of big-size square rulers by checking each other with three square rulers on platform in factories.
介绍了工厂对大尺寸直角尺精度检测与修复常用的在平台上三直角尺两两互检的方法与原理。在确定直角尺误差时，该方法的缺点是需要逻辑推理，较难掌握，功效较低。
This article introduces the common method and principle about the accuracy test and repair of big-size square rulers by checking each other with three square rulers on platform in factories.
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