Basic machining: lathe, drilling machine
Workshop and Manufacturing Practices · Engineering
Study notes
Turn a 50 mm diameter steel bar at cutting speed 40 m/min. Spindle RPM N = (40 x 1000)/(pi x 50) = 255 RPM. With feed 0.2 mm/rev and depth 2 mm, one pass over 100 mm takes 100/(255 x 0.2) = 1.96 min.