In a surface grinding operation wheel diameter = 150 mm and in feed = 0.07 mm. Wheel speed = 1450 m/min, work speed = 0.25 m/s, and cross feed = 5 mm. The number of active grits per area of wheel surface = 0.75 grits/mm2 . Determine
(a) average length per chip,
(b) metal removal rate, and
(c) number of chips formed per unit time for the portion of the operation when the wheel is engaged in the work.