CNC Machinist Horizontal Mill – 2nd or 3rd Shift
Posted Sep 17, 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 time you read a blueprint and caught something that didn't make sense before you machined it. What did you do?
What they are checking: Whether they stop and ask instead of cutting to a print they doubt, which protects costly heavy equipment parts.
Tell me about a safety habit you never skip around big rotating machines and heavy parts, and why.
What they are checking: Whether safety is a real personal habit in a safety-driven shop with heavy lifts and large spindles.
Describe a time you had a crash or a near miss on a machine. What happened and what did you change afterward?
What they are checking: Honesty about mistakes and whether they learned something concrete rather than hiding errors that could hurt people or equipment.
What would you do
Halfway through a part your bore is coming in a few tenths oversize. What do you check and in what order?
What they are checking: Structured troubleshooting under pressure: tool wear, offsets, heat and setup, rather than guessing and adjusting at random.
This is a 2nd or 3rd shift job with less engineering support around. How do you handle a problem at 2 a.m. that you can't solve alone?
What they are checking: Whether they know when to keep going, when to stop the machine, and how to hand off clearly to the next shift.
About the work
Walk me through how you set up a horizontal milling center for a large weldment you've never run before, from reading the print to cutting the first part.
What they are checking: Whether they follow a real setup sequence or improvise, since a bad first cut on a big weldment is expensive scrap.
What's your experience with large boring mills and boring bars? How do you deal with bar deflection and chatter on a long reach bore?
What they are checking: Hands-on knowledge of the specific boring bar work this role is built around, not just general CNC operation.
How do you indicate and square up a large casting or forging on the table when the part isn't perfectly true?
What they are checking: Whether they can find a sound datum on rough stock, which decides if every feature that follows lands in tolerance.
How do you use work offsets and tool length offsets, and how do you double check them before you hit cycle start?
What they are checking: Discipline around the most common cause of crashes and scrapped parts on CNC machines.
Which measuring tools are you comfortable with for checking a large bore, and how do you make sure your readings are accurate?
What they are checking: Whether they trust their measurements for the right reasons, like temperature, calibration and technique, on precision components.
How comfortable are you editing G-code at the machine, and when would you go back to programming instead of changing it yourself?
What they are checking: Judgment about program edits, which can save time or quietly create problems for the next operator and the next part.
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Practice this out loudThe full job description
As published by Caterpillar.