It is a fair question, and the honest answer has two parts. First, in most interviews you cannot use a cheat sheet during the test or the code-reading portion; policies vary, so it is worth asking, but assume no. Second, and more importantly, even when reference material is allowed, reaching for it to answer basic questions works against you.
Why a cheat sheet does not save you
The interview is checking whether you can read a program fluently. If you have to look up what G01 or M03 means, that is exactly the gap the interview is probing, and a cheat sheet makes the gap visible rather than hiding it. Looking up a genuinely rare code is fine and normal, even on the job. Looking up the common ones reads as inexperience.
| Situation | Cheat sheet OK? | What it signals |
|---|---|---|
| Test portion | Usually no | n/a |
| Common code question | Allowed or not, avoid it | Inexperience if you need it |
| A genuinely rare code | Often fine | Normal, even on the job |
What to do instead
The fix is recall, not a better sheet. When the common codes are automatic, you answer from memory and keep any reference for the rare cases. Drill the common G-codes and common M-codes with beginner CNC code practice, and see what to expect in a CNC setup interview and common questions asked in a CNC operator interview for the rest. A free tool like G-Code Sprint builds the recall that makes a cheat sheet unnecessary.
Bottom line
Usually you cannot use a cheat sheet during a CNC interview, and even when you can, needing it for the basics hurts you. Build recall of the common codes so you answer from memory, and keep a reference only for rare codes.
Sources
Frequently asked questions
Can I bring a cheat sheet to a CNC interview?
Usually not for the test or code-reading portion, and policies vary, so ask. Even where reference material is allowed, needing it to answer basic code questions signals inexperience. Treat the common codes as something you know without looking.
Is it bad to look things up in a CNC interview?
For rare codes, looking up is normal and even on the job you would. For the common codes the interview is testing, hesitating to look them up reads as not knowing them. The goal is instant recall of the basics.
How do I avoid needing a cheat sheet in an interview?
Drill the common codes until recall is automatic. A free tool like G-Code Sprint builds that fast recall, so you answer from memory and keep any reference for the genuinely rare codes.
G-Code Sprint is a study and practice tool only. Always follow your instructor, employer, machine manual, and shop safety procedures.