A cheat sheet app sounds perfect until you are standing at a machine in a metal building with no signal. The app will not load, and that is exactly the moment you wanted it. The dependable cheat sheet is a short one you have memorized, with a printed copy as backup.
The operator core
You do not need the whole standard at the control. An operator reads a tight set over and over:
- Motion:
G00,G01,G02,G03. - Spindle and coolant:
M03,M05,M08,M09. - Units and positioning:
G20/G21,G90/G91. - Program control:
M00,M01,M06,M30.
That is roughly fifteen codes. Memorized, they cover most of what passes under your eyes in a shift, which is why this is the core worth drilling first.
What belongs on the sheet
| Group | Codes | Why it matters daily |
|---|---|---|
| Motion | G00 G01 G02 G03 | Every cutting and positioning move |
| Spindle | M03 M04 M05 | Start, reverse, stop |
| Coolant | M08 M09 | On, off |
| Units / mode | G20 G21 G90 G91 | Inch/mm, absolute/incremental |
| Program | M00 M01 M06 M30 | Stops, tool change, end |
Memorize first, print as backup
A printed sheet never loses signal and never runs out of battery, so keep one. But the real win is needing it rarely. Drill the core with active recall, the method in beginner CNC code practice, and you read programs without stopping. The deeper code lists are in common G-codes for CNC beginners and common M-codes for CNC beginners. For more on studying without a connection, see CNC practice with no Wi-Fi, and for why recall beats lookup, shop-floor reference vs recall. A tool like G-Code Sprint builds that recall when you are online.
This is a study aid, not a machine reference. Your machine’s manual and your shop’s procedures are the authority at the control.
Bottom line
The best no-Wi-Fi cheat sheet is the short core you have memorized, backed by a printed copy. Drill the common motion, spindle, coolant, units, and program codes for recall, and the app being offline stops mattering.
Sources
- CNCCookbook: G-code and M-code cheat sheet
- LinuxCNC G-code quick reference
- LinuxCNC M-code reference
Frequently asked questions
What should be on a CNC operator cheat sheet?
The common motion codes (G00 to G03), spindle and coolant M-codes (M03, M05, M08, M09), units (G20/G21), positioning (G90/G91), and program-control codes (M00, M01, M30). That short core covers most of what an operator reads day to day.
How do I use a cheat sheet with no Wi-Fi?
Print it, or use an app that caches it for offline use, and treat it as a backup. The faster path is to memorize the core so you rarely reach for it. Recall does not need a connection.
What is the best no-Wi-Fi way to learn CNC codes?
Drill the core codes for recall before your shift, then carry a printed sheet as backup. A free tool like G-Code Sprint builds the recall when you have a connection; offline, the codes you have memorized are always available.
G-Code Sprint is a study and practice tool only. It is not a CNC simulator, machine controller, or safety authority. Always follow your instructor, employer, machine manual, and shop safety procedures.