CNC Machinist Helper is for any tool maker, cad designer, mechanical engineer, manager and tech. If you need a quick refecence to G codes, M codes, mills feeds, mill speeds, lathe feeds, lathe speed. Great for any shop person, welder, sheet metal, students, design engineer, drafter or hobbyist. G codes and M codes. Lathe and Mill feeds & speeds. Tap chart. Drill chart.