1) While part running time the SIM used under the insert got loosed due to which the OD got undersized, and the operator did not checked the part.|2) The tool was previously used in roughing operation in another machine and then the tool was removed from the previous machine and then loaded to the machine and continued the production without checking the tightness of the SIM.|3) Operator did not checked all the parts immediately after the completion of operations because of which the operator did not identified the looseness of the SIM. 