1) Chamfer oversize by 0.2mm beyond tolerance.|2) While providing the tool wear the operator provided 0.15mm increment instead of 0.4mm.|3) The tool used for the chamfer operation was a new tool made to carry out the chamfer operation on the inside edge of a wall.|4) The previous tool used was not providing proper life therefore the new tool was purchased and during trial the wear value provided by the operator was not adequate.|5) Operator did not calculated the exact tool offset as the tool was under trial.