G & M code is the language used to control CNC machines. To make a part on a CNC machine, you tell it how to make the part using a G & M Code Program. G & M code list is an app developed to collect almost all the G & M code commands used in CNC milling. CNC Machine Tools Reference also Included for your basic understanding about CNC Lathe Machine and milling tools. CNC Machine Tools is a free application for the CNC technology. Features of Learn G & M Code Reference Manual :- ✓ G-Code Intro