Needs only 38mm space on the end of shaft to cut new keyway, without dismantling the shaft from assembly. Cutting time for 25 mm wide, 12.5 mm deep & 150 mm long keyway is less than 15 Minutes. M/c makes a Keyway on a Ball Mill Shaft, while the shaft is in assembly. Sealed lubrication permits operation at any position of the machine.With the "V" type-mounting base, the Keyway Cutter will self-center onto an existing shaft, once the milling machine tool is clamped in place. The Keyway Cutter is capable of cutting keyways.