Which type of code is primarily used in CNC programming?

G-code and M-code are the primary types of code used in CNC programming. G-code, or General Code, is used to control the movements of the CNC machine, specifying actions such as positioning, speed, and feed rate. It includes a variety of commands that instruct the machine on how to perform tasks like linear movements, circular interpolation, and setting tools or offsets.

M-code, or Miscellaneous Code, complements G-code by providing commands for machine functions that are not related to movement, such as turning the spindle on and off, activating coolant, or pausing the machine operation. Together, G-code and M-code create a comprehensive programming environment that enables precise control over the CNC machinery.

The other choices contain codes that do not represent commonly used standards in CNC programming, making them less relevant overall. P-code and Q-code may have significance in certain contexts, but they are not primary CNC programming codes. A-code and B-code, as well as X-code and Y-code, are not established as key programming languages or standards in the same way that G-code and M-code are recognized in CNC machining.