Dia 12.7 hole machined with reamer and every batch reamer run out is checking.

This part got rejected in between the batch production of 10nos, because firstoff part checked by Operator, Supervisor & qad inspector.

route cause for this deviation was not found now.The following reasons may be for deviation.
1.Chips rubbed the bore due to insufficient coolent.
2.Pre drill diameter not achieved,This may cause more load to reamer. 
3. Part clamping not sufficient- may part vibrate when reamer entering the part.
4.Part Flatness is not correct.