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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.

Looking for a free online alternative to MakerCAM for your CNC machining projects? Look no further than JSCut! In this article, we'll introduce you to JSCut, an open-source online CAM software that allows you to generate G-code for your CNC machines with ease. Say goodbye to the discontinued MakerCAM and embrace JSCut's capabilities for a seamless CNC experience.