Shaft keyways for Woodruff keys are milled with Woodruff keyslot milling cutters (Figure 8-35 ). The Woodruff keyslot milling cutters are numbered by the same system employed for identifying Woodruff keys. Thus, a number 204 Woodruff keyslot cutter has the proper diameter and width for milling a keyway to fit a number 204 Woodruff key.
Square-end keyways can be cut with a plain milling cutter or side milling cutter of the proper width for the key
Round-end keyways must be milled with end milling cutters (Figure 8-37) so that the rounded end or ends of the key may fit the ends of the keyway. The cutter should be equal in diameter to the width of the key.