Assuming that the coefficient of friction in cutting is 0.25 for turning a hard aluminium alloy on a 20 hp lathe (mechanical efficiency = 90%) with a width of cut of 0.24 in, a rake angle of 11°, and a cutting speed of 333 ft/min. Assume the cut is at maximum depth and feed. Aluminium 1199-H18 has shear strength of 10.9 ksi.
Calculate:
1. Shear angle, phi
2. Cutting Force, Fc
3. Thrust Force, Ft
4. Friction Force, F
5. Shear Force, Fs
6. Area of Shear, As, and feed