GHaas G-Code Field Guide Get the book

Haas CNC quick reference · by Ethan Reynolds

The Haas G-Code Field Guide

Mill & lathe G and M codes — a shop-floor reference with diagrams, watch-outs, formulas and charts.

Look it up. See it. Get it right the first time.

Ships from Amazon · 160 pages · Which edition?

The Haas G-Code Field Guide — Haas G & M Codes for Mill and Lathe book cover by Ethan Reynolds
119codes, one page each
51mill codes
68lathe codes
71illustrated pages
160pages, edge-tabbed

Why this book

Clear answers without digging through a manual

The Haas operator's manual is complete — and long. When the machine is waiting, you need one page: what the code does, what each letter means, a real example, and the mistake to avoid.

  • Plain-English explanation for every one of the 119 codes
  • A real program example you can read line by line
  • Watch Out notes for the errors that crash machines or scrap parts
  • 71 illustrated pages — tool motion, drilling cycles, cutter comp, threading
  • Cheat sheets, formulas, tap drill charts and decimal references
  • Gray edge tabs to thumb straight to Mill, Lathe or Formulas
Sample page format

G83 Normal Peck Drilling Cycle

  • Peck drills and retracts to the R plane after each peck to clear chips.
  • Q = peck depth (incremental). Or I / J / K for diminishing pecks.
  • R = R plane. Z = bottom of hole. F = feed. Cancel with G80.
R plane Top of part Z depth 
G83 G99 X1. Y1. Z-1. Q0.2 R0.1 F8.
G80 G00 Z1.

WATCH OUT Too large a Q on a small drill packs chips and breaks the drill.

RELATED G73 · G80 · G98/G99

Read the full G83 page →

Built for

CNC studentsLearn what each code actually does — with pictures.
New operatorsRead a program before you press Cycle Start.
Setup machinistsCheck a cycle's letters in seconds during prove-out.
ProgrammersThe answer fast, without opening a PDF.

Free online reference

Look up a Haas code right now

A taste of the book's format, free on this site. Full lists: Haas mill G-codes, Haas lathe G-codes and M-codes.

G83Normal Peck Drilling CycleMill · Pecks by Q and retracts to the R plane every peck to clear chips. The go-to cycle for deep holes.G84Tapping Canned CycleMill · Rigid taps a right-hand thread: feeds in synchronised with the spindle, reverses, and feeds out.G41Cutter Compensation LeftMill · Offsets the tool to the left of the programmed path by the radius in the D register. Climb milling with a right-hand tool.G43Tool Length Compensation +Mill · Applies the tool length offset stored in register H so Z positions are measured from the tool tip.G28Return to Machine ZeroMill · Sends axes to machine home. Most commonly used as G91 G28 Z0. to retract Z before a tool change or at program end.G187Smoothness ControlMill · Trades speed against accuracy on contoured paths. P1 rough, P2 medium, P3 finish, with E corner tolerance.G71OD/ID Stock Removal CycleLathe · Roughs a turned profile in Z-direction passes, leaving finish stock for G70. Works for OD and ID.G76Threading Cycle, Multiple PassLathe · Cuts a complete thread from one line: first pass depth, total height, infeed angle and lead.G96Constant Surface Speed OnLathe · S becomes surface feet (or metres) per minute. RPM rises and falls automatically as diameter changes.G70Finishing CycleLathe · Runs the profile between blocks P and Q once, at finish size. Used after G71, G72 or G73 roughing.G75OD/ID Grooving CycleLathe · Pecks along X to cut grooves on the OD or ID, stepping along Z for wide grooves.G92Threading Cycle, Single PassLathe · Cuts one threading pass per line. You control every pass depth by writing the X values yourself.

Printable cheat sheet Speeds & feeds calculator Tap drill chart

Two editions

Paperback or hardcover

The Haas G-Code Field Guide paperback cover

Paperback

$19.99

  • Light enough for an apron pocket or lunchbox
  • Same 160 pages, every code and chart
  • Easy to buy one per machine
  • 6 × 9 in · 160 pages
  • ISBN 979-8162113287
Buy the paperback on Amazon
The Haas G-Code Field Guide hardcover cover

Hardcover

$74.99

  • Case-bound — survives the toolbox and the coolant
  • Lies open on the control pendant shelf
  • Built for the shop library or a gift
  • 6.24 × 9.24 in · 160 pages
  • ISBN 979-8162110279
Buy the hardcover on Amazon

Frequently asked questions

What is the Haas G-Code Field Guide?

A 160-page shop-floor reference to the G and M codes used on Haas CNC mills and lathes. Each of the 119 codes has its own page with a plain-English explanation, an example program, a Watch Out note and related codes.

Is it for the Haas mill or the lathe?

Both. It covers 51 mill codes and 68 lathe codes, separated by gray edge tabs so you can thumb straight to the right section.

Is this book good for beginners?

Yes. It is written for CNC students and new operators, with diagrams for tool motion, drilling cycles, cutter compensation and threading. Experienced setup machinists and programmers use it as a quick check.

Does it work with other CNC controls?

Most G-codes follow Fanuc-style conventions that Haas also uses, so much of it transfers. But it is written for Haas, and Haas-specific cycles and settings are called out as such.

Where can I buy it?

On Amazon in paperback ($19.99) and hardcover ($74.99).

Is the book made by Haas Automation?

No. It is an independent reference and is not affiliated with, sponsored by or endorsed by Haas Automation, Inc.

Keep it next to the control.

119 codes. 71 diagrams. One page each.

Paperback $19.99Hardcover $74.99