CNC Machinist jobs in Libertyville, IL

Walk me through setting up a 3-axis mill for a new job, from reading the work order to running the first part.

What they are checking: Whether they follow a disciplined setup sequence including tooling, fixture, offsets and first article, not just hitting cycle start.

How do you align a vise and locate the center of a fixture, and how do you check that you got it right?

What they are checking: Whether they have real hands-on setup skill and verify their work with indicators instead of trusting a guess.

You're machining engineered plastics here, not just metal. What changes when you cut plastic, and what problems do you watch for?

What they are checking: Whether they understand heat, chip control, part movement and dimensional changes that make plastics behave differently from steel.

Halfway through a production run, your in-process check shows a dimension drifting toward the limit. What do you do?

What they are checking: Whether they stop and find the cause, like tool wear or heat, before making scrap instead of running until it fails.

Which manual gauges do you use most, and how do you make sure your measurements are accurate?

What they are checking: Whether they handle calipers, micrometers and pins correctly and know how technique affects a reading.

You pull material from staging and something about it doesn't match the WOPAC. What do you do?

What they are checking: Whether they verify material before cutting and raise discrepancies instead of assuming it is close enough.

Tell me about a time you made a scrap part. What happened and what did you change afterward?

What they are checking: Whether they own mistakes honestly and learn a habit from them, which matters in a safety-sensitive, quality-driven shop.

What does 5S mean to you on a machine, day to day?

What they are checking: Whether they treat organization and cleanliness as part of quality and safety rather than a cleanup chore.