Machine-tools 991 Metal-cutting tools 579 Numerical control 372 Metal-cutting 247 Machining 225 Surface roughness 197 Programming 130 Materials 100 Milling-machines 99 Design and construction 95 Tools 91 Automation 69 Machine-shop practice 64 Rapid tooling 62 Cutting tools 55 Titanium alloys 52 Rapid prototyping 47 Woodworking tools 47 Vibration 38 Mechanical wear 34 Machine tools 32 Cutting machines 30 Data processing 30 Electric metal-cutting 29 Manufacturing processes 29 Human engineering 24 Measurement 24 Power tools 24 Machine design 23 Woodwork 23