Mod-1 Lec-9 Sheet Metal Operations - 3 

okay guyzz....there are few corrections in this video.....1) D=sqrt( d2+4dh ) when d>=20r.....rest of d relations in calculation of D are correct as shown.........n Drawing Force P = k * (pi) *t d Y......("pi" will replace "t" ) P.S : d2 is square(d)

At 51:15 the clearance would be "C = k × t" the shear strength variation in different materials would be compensated by the constant "k" as it is different for different materials

Why would the blank thickness increase during the process?

In calculating the drawing force once check that units are not matched on both sides.

22:00 what's the difference between 1st and 2nd equations? or has my vision degraded? :/

thank you sir very much