How to Screen a 5-Axis CNC Machinist
Five-axis experience is not one skill level. A useful screen separates people who have loaded and run proven work from people who can own the setup, prove out the process, recover intelligently, and protect an expensive machine.
Start With Ownership, Not Years
Ask the candidate to walk through the last 5-axis job they personally owned. The important detail is what they were responsible for: locating work, choosing or proving workholding, establishing work offsets, loading tools, setting lengths, verifying orientation, proving motion, inspecting the first article, and correcting the process.
Eight Areas to Verify
- Machine configuration: trunnion, swivel-head, table-table, head-table, or other kinematic arrangement.
- Control: what the machinist actually did on the control—not just which brand appeared on the machine.
- Workholding: access, rigidity, clearance, repeatability, and how the setup supports multiple faces.
- Offsets & probing: work coordinate strategy, probing routines, tool measurement, and how offsets are verified.
- Programming responsibility: posted programs, at-control edits, macros, transformations, or full CAM responsibility.
- Collision awareness: how they prove rotary motion, check retracts, manage long tools, and avoid fixture/part interference.
- First article: inspection plan, datum strategy, geometric relationships, and correction logic.
- Troubleshooting: chatter, reach, tool deflection, rotary positioning, finish, tolerance drift, and cycle-time constraints.
Questions That Expose Real Experience
- “Describe a 5-axis setup you built from an empty table to first good part.”
- “How did you establish and verify the work coordinate system?”
- “What was the closest collision risk in the setup, and how did you prove clearance?”
- “What did you change when the first article was out of tolerance?”
- “What part of the process was yours versus the programmer, setup person, or operator?”
Red Flags
- Answers stay at “I ran 5-axis” without explaining setup ownership.
- The candidate cannot describe how rotary orientation affects offsets, clearance, or inspection.
- They name a control or CAM package but cannot explain what they personally changed or verified.
- They cannot describe first-article correction or a real troubleshooting example.
Technical Review
Reviewed September 1, 2026 by Maverick Boudreaux, founder of Titan Trades CNC and CNC machinist. This guide is intended to help manufacturers screen for actual responsibility and should be adapted to the machine, control, part complexity, and process in your facility.
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