Outer flange cut up to  20mm .  |Wrong tool offset.  |When setting time Operator wrong enter the offset.     |1.the tool offset taken was recorded wrongly in the Log book and the same was entered into the system
2.2.The offset taken was not validated in with the previous one which was recorded in the log book|3.Operator entered Wrong Tool offset  in the system and did not follow the check list provided for setting.