Tool marks formed in the bore of the part due to vibration of the part while experiencing sudden overload|The tool used for forming the countersink in the walls of the part did not had sufficient clearance to pass through the bore of the part.|The bore diameter was not finished to the requirement and was maintained in stock to achieve the hole position and was planned to be done in an alternate machine.|Due to X-axis error in the machine the bore was planned to be finished in an alternative machine.