CNC Machinist
Posted Jul 22, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a difficult part you machined and how you figured it out.
What they are checking: Whether they solve problems and plan operations well when a job isn't straightforward.
How do you keep your work area and machine in good condition?
What they are checking: Whether they take care of equipment and keep things organized for the next person.
What would you do
Your parts start drifting out of tolerance partway through a run. What do you do?
What they are checking: Whether they troubleshoot tool wear, heat or setup issues instead of continuing to make scrap.
You think the drawing has an error. What do you do?
What they are checking: Whether they raise concerns with engineering before cutting expensive material.
About the work
Walk me through how you set up a CNC lathe for a new shaft job from the drawing and route sheet.
What they are checking: Whether they can plan operations, set tools and offsets and get a good first part independently.
Which controls and machines have you run, and can you edit programs at the machine?
What they are checking: Whether they have hands-on experience with CNC controls and can make basic program adjustments.
How do you handle thread cutting and check that the threads are right?
What they are checking: Whether they know threading setups and use gauges to confirm quality.
What changes do you make when machining stainless or other tough alloys compared to mild steel?
What they are checking: Whether they understand speeds, feeds and tooling for different ferrous and non-ferrous metals.
What measuring tools do you use to check your parts?
What they are checking: Whether they can accurately inspect their own work with micrometers, bore gauges and similar tools.
How do you stay safe around rotating equipment and chips?
What they are checking: Whether they follow safe practices that prevent injuries in a machine shop.
Practice this interview out loud.
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Practice this out loudThe full job description
As published by Barry-Wehmiller.