The cutting length of the broach for the key way cutting in a 150 mm long east iron gear hub. Given that width of the key way is 9 mm depth of key way is 4.5 mm of finishing teeth = 4 and no. of semi finishing teeth = 8. Rise per tooth Pitch Roughing teeth 0.1 mm 22 mm Semi finishing 0.0125 mm 20 mm Finishing teeth 0 mm 20 mm