What Every Machinist Needs to Know About G-Code Basics

This week, Marc from G-Code Tutor takes us back to basics with G-Code programming. This is the first part of a three-part series where we revisit the fundamentals and learn the foundations of becoming a proficient G-Code programmer. We start with a brief look at the history of G-Code, discovering that it is one of the earliest high-level programming languages still in use today. Marc then discusses punch tapes and how programs were stored before hard disk drives became prevalent. It is important to have a basic understanding of these topics before moving on to basic G-Code programming. Next, we explore the Cartesian measurement system, which all CNC machines use to plot tool movements accurately. Marc introduces a few essential G-codes that everyone must learn first. He explains G00 and G01, which are used to move the tool in a linear direction, and G02 and G03, which are used to create arcs. We briefly cover how to designate the center point of an arc and how to add corner radii. We then examine the differences between climb milling and conventional milling, along with guidance on when to use each method. Finally, Marc demonstrates a complete sequence of a G-Code program, breaking down each section to show how everything works together. He also discusses the use of cycles and subroutines to minimize the amount of code needed. For more information on G-Code programming, CAD/CAM, machine shop math, safety, manual lathe operations, and much, much more, visit https://gcodetutor.com and level up your machine shop skills today.