A badge buddy is the card that rides behind an ID badge, and machinists have printed code references onto them for as long as both have existed. The format’s constraint is its virtue: at badge size and legible type, you get about twenty codes, which forces the only editorial decision that matters, what you actually look up.
What earns a spot on the front?
The codes you reach for while reading or typing at the control, drawn from the standard G-code set:
| Front of card | Meaning |
|---|---|
G00 / G01 | Rapid / feed move |
G02 / G03 | Arc CW / CCW |
G20 / G21 | Inch / metric |
G90 / G91 | Absolute / incremental |
G54-G59 | Work offsets |
G43 H_ | Tool length offset |
G40 / G41 / G42 | Cutter comp off / L / R |
G28 | Return to home |
That is the whole front: sixteen entries, readable at 7-point type at arm’s length. Resist additions; every extra row shrinks everything.
What earns the back?
The M-code families plus the one line that prevents the most accidents:
| Back of card | Meaning |
|---|---|
M00 / M01 | Stop / optional stop |
M03 / M04 / M05 | Spindle CW / CCW / stop |
M06 T_ | Tool change |
M08 / M09 | Coolant on / off |
M30 | Program end |
| Safety block | G21 G17 G40 G90 |
Printing the M-codes as families, ons then the off, quietly teaches the pattern that makes the card unnecessary, the structure from the G-code mnemonics collection.
How should you produce it?
Badge format: roughly 2.25 by 3.5 inches, matching the ID it hangs behind, on the same clip or lanyard so it survives pocket laundering. Laminate it or use a rigid badge sleeve, because coolant mist and graphite find everything. Monospaced type, nothing under 7 points, dark on light. The fuller letter-size version of this idea, with room for working notes, is the blank G-code worksheet, and the standard online cheat sheets make good sources to transcribe from, but transcribe selectively: the card’s power is what you left off.
When is the card the wrong answer?
Two situations. Assessments that prohibit references, where the card you trained on becomes the dependency that fails you, and any moment the card has become permanent furniture. A reference card is scaffolding: each code you drill to instant recall gets mentally crossed off, and the healthy trajectory is a card consulted daily in week one, weekly in month one, and never by month three. If the card still earns its lanyard spot after a season, the codes need drilling, not a better card, the same planned obsolescence argued for every memory aid in how to memorize G-code faster.
A concrete pattern: a training cohort got identical badge cards on day one, and the instructor’s quiet metric was watching them stop being used. The fastest learners pocketed theirs inside three weeks, not because the cards were bad but because short daily drills had emptied them of news. The card’s job was to be outgrown on schedule.
What about the phone in your other pocket?
The digital version of this card already lives there, and the offline app options are compared in the no-WiFi cheat sheet apps, while the other commute format, listening, gets its honest verdict in the G-code audiobook question. The difference worth noting: a card shows codes, while a recall tool retires them, quizzing the set and repeating misses until lookup stops happening. Print the badge buddy for the floor, and let the drills on the G-code practice hub make both versions obsolete.
Bottom line
A badge buddy earns its place with ruthless selection: motion, units, positioning, and offsets on the front, the M-code families and a safety block on the back, twenty-odd codes at legible size, laminated at badge dimensions. Then treat it as scaffolding and drill the contents until the card is decoration. The best cheat sheet is the one you provably no longer need.
Sources
Frequently asked questions
What should go on a CNC cheat sheet badge buddy?
Only the high-frequency codes at legible size: motion, units, positioning, and offset calls on the front; the spindle, coolant, tool-change, and program-end M-code families plus a safety-block line on the back. Around twenty entries total.
What size is a badge buddy card?
Roughly 2.25 by 3.5 inches, matching a standard ID badge, laminated or sleeved, with type no smaller than about 7 points.
Is a cheat sheet card allowed at work or during tests?
On the floor almost always; in assessments it varies and certification tests usually prohibit references. Ask beforehand, and keep the codes in memory regardless.
What is the best digital alternative to a badge buddy cheat sheet?
A free recall app like G-Code Sprint: the codes are always on your phone, and it actively retires the reference by quizzing you and repeating misses until lookup stops.
G-Code Sprint is a study and practice tool only. Always follow your instructor, employer, machine manual, and shop safety procedures.