About the book

The Haas G-Code Field Guide by Ethan Reynolds is a shop-floor reference for the G and M codes used on Haas CNC mills and lathes. It was written for the moment at the machine when you need an answer in seconds, not a 500-page manual.

Every one of the 119 codes — 51 for the mill and 68 for the lathe — gets its own page: what it does in plain English, a real program example, a diagram where words fall short, a Watch Out box for the mistake that crashes machines or scraps parts, and the related codes to check next.

Who it is for

• CNC students and apprentices
• New operators learning to read programs
• Setup machinists proving out jobs
• Programmers who want the answer fast

Book details

• Published October 13, 2026 · 160 pages · English
• Series: Haas CNC Quick Reference: G & M Codes for Mill and Lathe
• Paperback ISBN 979-8162113287 · Hardcover ISBN 979-8162110279

Independent reference. Not affiliated with, sponsored by or endorsed by Haas Automation, Inc. Haas is a trademark of its respective owner. Always confirm codes against your machine's operator manual — options and settings vary by model and software version.