A cup of $$10$$ $$cm$$ height and $$5$$ $$cm$$ diameter is to be made from a sheet metal of $$2mm$$ thickness. The number of deductions necessary will be

For $$50\% $$ penetration of work material, a punch with single shear equal to thickness will

In blanking operation, the best way to improve the smoothness and squarness of the edges is to

In a bending operation, If the modulus of elasticity $$E$$ is increased keeping all other parameters unchanged, the spring back will