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Top 20 CNC Operator Interview Questions

Question 1 of 23
How much more did you learn at your first job that your training didn't teach you?
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Question 2 of 23
What is a vernier?
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"From my understanding, a vernier is a small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of a barometer, sextant, or other measuring instrument."
Answer this briefly and matter of factly.

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Question 3 of 23
What are the CN languages?
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"G-Code is the number one language used to instruct CNC machining devices what motions they need to perform such as work coordinates, canned cycles, and multiple repetitive cycles. Industry has standardized on G-Code as its basic set of CNC machine codes so this is what I am trained in. Are there other languages you would prefer that I know?"
How you answer this will show the hiring manager how well versed and up to date you are within the industry. Answer briefly, giving an example of the language(s) that you are most familiar with.

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Question 4 of 23
What is a micrometer?
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"A micrometer is a gauge that measures small distances or thicknesses between its two faces, one of which can be moved away from or toward the other by turning a screw with a fine thread."
Answer this briefly and matter of factly.

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Question 5 of 23
How many sixteenths are in an inch?
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You can take a moment to think, if needed, but make sure you are right!

When you answer this question you can also talk through your answer so that the hiring manager understands how you are coming to your conclusion.
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Question 6 of 23
What makes you want to be a CNC Operator?
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Question 7 of 23
Whats the reason you applied to work at our shop?
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Question 8 of 23
How well have you adapted to a machine you were unfamiliar with?
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Question 9 of 23
What challenges do you sometimes face while operating your machine?
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Question 10 of 23
What was the toughest part you created as a CNC Operator?
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Question 11 of 23
Have you ever messed up a part that cost your company a significant amount of money? What happened?
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Question 12 of 23
What was your most difficult challenge while operating a machine?
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Question 13 of 23
What CNC equipment have you worked with before?
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Question 14 of 23
How much time in your career, have you spent operating a CNC machine?
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Question 15 of 23
How was your education? How well did it prepare you for your first job?
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Question 16 of 23
What versions of CAM do you know?
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Question 17 of 23
Which machine do you have the most experience working on?
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Question 18 of 23
How long have you been a CNC Operator?
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Question 19 of 23
What do you know about our company and what we manufacture?
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Question 20 of 23
Tell me about a time when you met a tough deadline.
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Question 21 of 23
Where did you learn to be a CNC Operator? Have you ever thought about more training?
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Question 22 of 23
Have you ever had an engineer design a part that you could not understand/read their directions? How did you overcome this obstacle?
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Question 23 of 23
What did you dislike the most about your last shop?
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About CNC Operator

August 17th, 2017

Numerical control (NC) refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to manually controlled via handwheels or levers, or mechanically automated via cams alone. The first NC machines were built in the 1940s and '50s, based on existing tools that were modified with motors that moved the controls to follow points fed into the system on punched tape. These early servomechanisms were rapidly augmented with analog and digital computers, creating the modern computed numerically controlled (CNC) machine tools that have revolutionized the manufacturing process.

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