The figure shows the outlines of a general purpose power screw press of 3 ton press capacity. The power screw is of single Sq..Th. 306 mm. The coefficient of friction.is 0.15 for the collar and for the threads. The frictional diameter of the collar is 20 mm. (A= 100 mm) a) Calculate the total torque required to produce F= 3 ton. b) By using the max normal stress theory, Determine the safety factor based on sec B-B, if the press frame is made from GS 60 (oy-360 MPa, = 600 MPa). 50 H Sec B-B All Dim. in mm