---
title: "Can I Use a Cheat Sheet During a CNC Interview?"
description: "Usually not during the test portion, and even when allowed, leaning on one reads as inexperience. Here is the honest answer and what to do instead."
url: https://gcodepractice.com/journal/can-i-use-a-cheat-sheet-during-a-cnc-interview/
canonical: https://gcodepractice.com/journal/can-i-use-a-cheat-sheet-during-a-cnc-interview/
author: "Lawrence Arya"
authorUrl: https://www.linkedin.com/in/vibecoding/
published: 2026-06-02
updated: 2026-06-02
category: "Practice"
tags: ["interview", "cheat sheet", "recall", "test prep"]
lang: en
---

# Can I Use a Cheat Sheet During a CNC Interview?

> **TL;DR** In most CNC interviews you cannot use a cheat sheet during the test or code-reading portion, and even where reference material is allowed on the job, reaching for it to answer basic questions reads as inexperience. The fix is not a better cheat sheet; it is recall, so the common codes come instantly. Keep a reference for rare codes; know the common ones cold.

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](/journal/common-g-codes-for-cnc-beginners/) and [common M-codes](/journal/common-m-codes-for-cnc-beginners/) with [beginner CNC code practice](/journal/beginner-cnc-code-practice/), and see [what to expect in a CNC setup interview](/journal/what-to-expect-in-a-cnc-setup-interview/) and [common questions asked in a CNC operator interview](/journal/common-questions-asked-in-a-cnc-operator-interview/) for the rest. A free tool like [G-Code Sprint](/g-code-practice/) 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

- [LinuxCNC G-code reference](https://linuxcnc.org/docs/html/gcode/g-code.html)
- [CNCCookbook: G-code and M-code cheat sheet](https://www.cnccookbook.com/g-code-m-code-cnc-list-cheat-sheet/)
- [Wikipedia: G-code](https://en.wikipedia.org/wiki/G-code)

## 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.*

---

Source: https://gcodepractice.com/journal/can-i-use-a-cheat-sheet-during-a-cnc-interview/
Author: Lawrence Arya — https://www.linkedin.com/in/vibecoding/