2. Study samples NG specimen ever found.Know how to check the NG as follows.2.1 ID&OD loss size daimeter inside - outside.Not according to standard to check with pin gauge.After the cutting process of No.1 2 Cut,,2.2 Appearance inspection with the naked eye, by shedding the light.2.3 Contaminate loss is dust black or foreign bodies.Check with the naked eye by shining light.
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