• # question_answer                    A blank of 30 mm diameter is to be produced out of 10 mm thick sheet on a simple die. If 6% clearance is recommended, then the nominal diameters of die and punch are respectively:                  A) 30.6 mm and 29.4 mm              B) 30.6 mm and 30 mm                  C) 30 mm and 29.4 mm                   D) 30 mm and 28.8 mm

In banking operation, clearance is provided on punch. Here clearance $=6\times \frac{10}{100}=0.6=0.6\,mm$ Punch size $=30-0.6=29.4\,mm$