Tech Explained

G-codes, also called preparatory codes, are any word in a CNC program that begins with the letter G. Generally it is a code telling the machine tool what type of action to perform, such as:

• Rapid movement (transport the tool as quickly as possible in between cuts)
• Controlled feed in a straight line or arc
• Series of controlled feed movements that would result in a hole being bored, a workpiece cut (routed) to a specific dimension, or a profile (contour) shape added to the edge of a workpiece
• Set tool information such as offset
• Switch coordinate systems

There are also other codes like for example the M-code.

List of M-codes commonly found on FANUC and similarly designed controls for milling and turning.

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Computer Aided Manufacturing (CAM) is the use of software and computer-controlled machinery to automate a manufacturing process.

CNC is an acronym for "Computer Numerical Control" or "Computerized Numerical Control". The word originaded by the acronym NC that means Numerical Control.  In modern English cnc has also acquired other meanings that are not related to this topic and that we will not explain in this article.