1) Countersink diameter was not measured as per the requirement.							
|2) The diameter of the countersink was .4.45 to 4.65mm greater than the drawing requirement as the tool was stepping down beyond the requirement.			
|3) operator did not left stock for the countersink operation and did not ensured proper dept.			
|4) operator was not aware of the standard method practiced for forming the countersink.			