Portable Keyway Milling Machine with Auto Feed Portable Keyway Milling Machine Jinshaa Machines Portable Keyway Milling Machine. The model JSM 304 Keyway Cutter is designed to mill (6mm) to (32m ) wide by 155 mm long keyway slots in 50mm to 300 mm diameter shafts. The cutter may be used to mill new keyways ,recut keyways after being weld repaired or to mill a new keyway to replace a damaged keyway .The machine uses a two bar v guide block system to auto align and center the tool to the shaft .for larger size shafts a system of chain clamps are included . The tool incorporates a geaduated depth of cut system .Axial feed is provided for by a manual ratched system. The model uses standard 16 m shank mill cutters The machine comes with a standard storage case a selection of endmills from 6mm to 32 mm and clamping systems from 50 mm to 300mm diameter shafts.The machine uses Hiwin make Linear Guideways and no Cast iron dovetails guides giving complete rigidity over the milling process M