A CNC machinist shortage is tightening lead times across job shops and contract manufacturers—and hiring the wrong person costs you thousands in scrap and delayed deliveries. Vetting candidates properly separates shops that scale from those stuck fighting fires. Here's how to interview, assess, and onboard machinists who actually move your business forward.
Why Standard Resumes Fail for CNC Roles
A resume tells you nothing about whether someone can hold ±0.005" tolerances or troubleshoot a spindle vibration issue at 8 AM. CNC machining demands hands-on problem-solving, geometric reasoning, and the judgment to know when to call engineering versus tweaking feeds and speeds yourself. You need a structured process that reveals practical capability.
Pre-Interview Screening: Filter Before You Meet
Before scheduling, ask candidates to walk you through a specific job. Request they describe:
- The last complex part they ran (material, tolerance stack, setup complexity)
- How they diagnosed and fixed the last machine issue they encountered
- What CAM software they're proficient in
- Whether they've worked with 3-axis, 4-axis, or 5-axis mills, and which they prefer
A real machinist will give you specifics. Someone padding their resume will stay vague. Most quality applicants won't mind a 10-minute phone call where you ask these questions—it signals you're serious about skill.
Core Interview Questions That Matter
"Walk me through how you'd set up this part." Hand them a print (choose something in your normal job mix—aluminum bracket, steel block, whatever). Don't expect a perfect answer; watch how they read the drawing, ask about fixtures, and think through tool changes. Someone who asks about datum references and part orientation is thinking like a programmer. Someone who jumps straight to "I'd just clamp it" needs more mentoring.
"Tell me about a time you caught a mistake before it became scrap." This reveals attention to detail and whether they're checking first-article parts, monitoring coolant condition, or measuring during a run. Machinists who prevent problems are rare and worth more.
"What's your experience with [your specific equipment]?" If you run Haas mills, ask about Haas. If you're a Okuma shop, drill down on that. Transferable skills matter, but someone with hands-on time on your exact machines ramps faster.
"How do you approach learning new programs or processes?" CNC is constantly evolving—new tooling, newer CAM, tighter tolerances. Someone who says "I figure it out" or "I read the manual and ask questions" is growth-minded. Someone defensive or dismissive will hold your shop back.
Practical Skills Assessment
Consider a paid working trial—typically 2–4 hours, $50–$80 depending on your market. Have them:
- Load and run a familiar part (not your most complex job)
- Troubleshoot a minor setup issue (a runout condition, a tool offset tweak)
- Demonstrate their measurement approach
This costs you $60–$120 and saves you thousands in bad hires. A machinist confident in their skills welcomes this; someone bluffing will decline or perform poorly.
Red Flags
- Vague tool experience. If they can't name specific machines or software, they're speaking in generalities.
- Blame-shifting. "The last shop had terrible tools" or "The programmer was bad" suggests they don't own their work.
- **No curiosity about your work.** They should ask about your tolerance requirements, material mix, and growth plans.
- Immediate salary demands without understanding the role. Fair wages are essential, but someone negotiating blind isn't asking the right questions first.
Compensation Reality Check
Entry-level CNC machinists (0–3 years) run $18–$26/hour in most U.S. markets. Mid-level (3–7 years, independent job planning) typically $26–$38/hour. Senior machinists with setup, troubleshooting, and light programming skill command $38–$55+/hour. Remote areas and tight labor markets shift these ranges upward.
Setting Them Up for Success
Hire well, then invest. Pair new hires with your best machinist for the first two weeks. Document your standard procedures and tolerance philosophy. Check in after 30, 60, and 90 days—not to intimidate, but to clarify expectations and catch training gaps early.
When you're ready to scale, listing your shop on Mercoly helps you attract qualified candidates actively looking for positions, and it positions you to win contract manufacturing leads from customers searching for reliable CNC partners.
Frequently Asked Questions
Q: How long should I expect a new hire to take before running jobs unsupervised? A: A machinist with 2+ years on similar equipment typically needs 2–4 weeks; someone newer or switching equipment types may need 8–12 weeks, depending on your complexity.
Q: Should I require a CNC certification, or is hands-on experience enough? A: Certifications like the NIMS CNC Machining certification validate fundamentals, but real-world experience running parts matters more; ideally, candidates have both.
Q: What should I do if my top candidate has the skills but salary expectations are high? A: Benchmark your local market and ask what specific skills or responsibilities justify their ask; you may compromise on a higher starting wage if they can lead setup or mentor junior staff within six months.
Post your shop on Mercoly to reach serious CNC clients and connect with job-ready machinists in your area.