1) Insert locking screw was not tightened.		
|2) Operator hand tightened the screw with hand and went in search of the cutting player after getting the player he just corrected the wear offset and continued the production.	|3) Operator did not practiced to clamp the insert with align key and he did not checked the tightness of the insert.	|4) Operator got distracted and forgot to ensure the tightness if the insert.					