Machinist: job description, interview questions, and screening workflow

"5 years machining experience" on a resume doesn't tell you whether someone can pick up an unfamiliar print, plan the setup themselves, and hand you a first piece that's actually in tolerance. That's the whole job at a small shop, and it's exactly the part a resume can't show you. You probably don't have a programmer setting up the job before someone else runs it, and you don't have a quality department double-checking every piece behind them. The candidate has to do the reading, the planning, and the checking themselves, and the only way to know if they actually can is to ask them to walk you through it. This guide is built to screen for that, not for a line item on a resume.

What a machinist actually does at a small shop

At a small machine shop, a machinist is usually the person who takes a print and a raw piece of stock and turns them into a finished part with no one else doing the thinking in between. That means:

• Reading blueprints and work orders accurately, including GD&T callouts, tight tolerances, and finish requirements
• Planning the setup: choosing workholding, tooling, and the order of operations before anything runs
• Setting up the job itself: work offsets, tool offsets, and often writing or editing the program
• Running manual mills and lathes as well as CNC equipment, depending on the job
• Taking precision measurements throughout a run with calipers, micrometers, and gauges, and using a CMM when the part calls for it
• Catching a part drifting out of tolerance and troubleshooting the cause: a worn tool, a shifted offset, a bad fixture
• Working from a print with minimal supervision, because at a small shop there's often no one else checking the work before it ships

This is a broader job than a CNC machine operator, and the difference matters more than the two titles suggest. A CNC operator typically runs a job that someone else has already programmed and set up: they load parts, hit cycle start, and do the in-process checks the setup calls for. A machinist does the part the operator role skips. They read the print cold, decide how the part gets held and cut, build the setup from nothing, and often program or edit the code themselves. Some shops use the titles loosely, but the skill gap between them is real, and a posting that blurs the two either scares off a real machinist who assumes you're underpaying for their skill, or sets up an operator-level hire to fail on a job that needed someone who could plan a setup from scratch. If the role you're actually filling is closer to running machines that are already dialed in, our CNC machine operator hiring guide is the better starting point.

Think about what happens on a Friday afternoon when a new job lands with a print nobody's seen before and no one's around to help plan it. If the honest answer is "we wait for Monday" or "we hope it comes out right," that gap is what this hire closes.

Job description you can post today

Copy this, then adjust the specifics (your machines, your typical work, pay) to match your shop.

Machinist
[Company name] is looking for a machinist who can take a print and a piece of raw stock and turn it into a finished part, start to finish. You'll read blueprints, plan and build your own setups, and run manual and CNC equipment to hold real tolerances with minimal supervision.

What you'll do
Read blueprints and work orders, including GD&T callouts and tight tolerances. Plan and build job setups: workholding, tooling, work and tool offsets, and operation order. Program or edit CNC code as needed for the job in front of you. Run manual mills and lathes as well as CNC mills and lathes, depending on the work. Inspect parts throughout the run with calipers, micrometers, gauges, and a CMM when the job calls for it. Troubleshoot when a part drifts out of tolerance and fix the root cause, not just the symptom.

What we're looking for
Real experience reading prints and planning your own setups, whether that came from a shop floor, an apprenticeship, or a machining program. Comfort on both manual and CNC equipment. Precision measurement skill you can demonstrate, not just describe. Good judgment about what to fix yourself and what to flag. A NIMS credential, apprenticeship, or machining degree is a plus, not a requirement, if you can show the skill.

Schedule
[Insert hours, shift pattern, any overtime expectations]

[Insert pay range, per your company's policy and any applicable state salary transparency requirements]

12 interview questions, and what a good answer sounds like

1. Walk me through reading this print, cold. What are you checking before you plan anything?

You want a real process, not a general "I'd read it over." A strong answer names specifics: critical dimensions, tolerances, GD&T callouts, material and finish requirements, and datum references. A candidate who jumps straight to "I'd just start setting up" without naming what they checked first probably hasn't done real setup planning on their own.

2. This part has a true position callout with a tight tolerance. Walk me through what that actually means and how you'd hold it.

This is a direct GD&T check, and it separates candidates fast. A strong answer explains the concept correctly, in their own words, and connects it to a real workholding or measurement decision. A candidate who can only guess, or who confuses true position with a simple linear tolerance, likely hasn't worked with real GD&T callouts before, whatever the resume says.

3. Walk me through setting up a new job on a fixture you've never used, from the print to the first good part.

This should come out as an ordered sequence: choosing workholding, loading the program or writing it, setting offsets, a dry run or proveout, and a first-piece inspection before releasing to full production. A candidate who skips the first-piece check, or who describes it as "I just run it and see," is describing a process that produces expensive scrap the first time something's off.

4. A part comes out .003 over tolerance halfway through a run. What do you actually do, in order?

You want a real sequence: stop and isolate the cause (tool wear, a shifted offset, thermal drift, a fixture issue), determine which parts already run are affected, correct the setup, and verify before continuing. A candidate who jumps straight to "I'd just adjust the offset" without diagnosing the cause first may fix the symptom and leave the real problem to happen again.

5. What's your process for measuring a part with calipers versus a micrometer versus a CMM? When do you reach for each one?

Listen for real technique and real judgment about which tool fits which tolerance. Calipers for coarser checks, a micrometer for tighter tolerances, a CMM for complex geometry or a formal inspection record. A candidate who says "I just use whatever's closest" hasn't internalized that the tool has to match the tolerance the print asks for.

6. Tell me about a time you caught a quality problem before it left the shop. What tipped you off?

You want a specific story: what they noticed, how they verified it was real, and what they did next. A strong answer shows they were checking in-process, not just trusting the first piece to hold for the whole run. A candidate who can't produce a real example probably hasn't been checking closely enough to catch one.

7. How comfortable are you on a manual mill or lathe versus CNC equipment? Walk me through the last manual job you ran.

Some shops need real manual skill, not just CNC hours. Push for a specific job, not a general claim of being "comfortable with manual." A candidate who's only ever loaded parts into an already-set-up CNC machine may not have the manual dexterity or setup instinct this role needs, even with years on paper.

8. Tell me about a machine, control, or type of job you hadn't run before and had to get up to speed on. How did you do it?

Push for a real story with a real timeframe: what they read, who they asked, what they practiced on before running production parts. A candidate who stays vague, or claims they picked it up instantly with no real process, may be overstating how fast they actually ramp on unfamiliar equipment.

9. How do you decide when a problem is something you handle yourself versus something you stop and flag to [owner or shop lead]?

This is the judgment that matters most when there's no one standing over the machine. Listen for a clear line: routine adjustments they handle and document, anything touching tolerance risk or safety they stop and flag. A candidate who never escalates is a scrap and liability risk. One who escalates everything defeats the point of hiring someone who can run a job solo.

10. Tell me about a time you had to write or edit a CNC program, or fix one that wasn't running right.

You're checking whether they've actually touched code, not just run programs someone else wrote. A strong answer names the control they used, what they changed, and why. A candidate who's never edited a line of code may still be a fine operator, but that's a real gap if the role needs someone who sets jobs up from scratch.

11. What does a safe setup look like to you? Tell me about a close call or a hazard you caught before it became an accident.

You want a real example and a real action: a guard used correctly, a workholding fixture that wasn't fully seated, a lockout followed properly. A candidate who can't produce an example, or who downplays the question, is telling you something about how they'll behave the next time something's off.

12. Why a small shop, instead of a bigger plant with a dedicated programmer and quality team?

This surfaces whether they understand what they're signing up for. A strong answer names something real: more ownership of the whole part from print to finish, more variety, direct visibility into the business. A candidate who can't articulate a reason beyond "it was the job that was open" may be underprepared for the range of responsibility this role actually carries.

A scorecard you can score candidates against

Twelve questions only help if everyone on your side is listening for the same thing. Score every candidate on the same six signals, so you're comparing evidence instead of gut feelings about who "sounded like a real machinist."

How to screen machinist candidates without losing a week to it

Truffle is a candidate screening platform that combines resume screening, one-way video interviews, and talent assessments, so you can build a screening process sized for a small shop with no dedicated HR or quality department to lean on.

This trade breaks a lot of standard hiring advice. Plenty of strong machinists apply by walking in, calling, or following up in person rather than submitting a polished application, and a resume is a weak signal here anyway: it tells you where someone worked, not whether they can plan a setup or hold a tolerance. Post where the candidates actually look. Indeed carries far more weight than LinkedIn for this trade, and a thin applicant pool is often a sourcing problem, not a labor-market problem.

A workflow that fits a small machine shop:

• Don't screen out candidates for a thin or missing resume. A phone call gets you more signal than a resume will for this role. Confirm the basics, like work authorization and a real shop or machine they can name, before you invest more time.
• A short one-way video interview next. Ask the GD&T question and the "part drifted out of tolerance mid-run" question on video. Judgment and specificity are hard to fake on camera, and it saves you from scheduling a floor visit with someone who can't answer either one with a real example. Our one-way video interview tool handles this step, with AI that surfaces your strongest matches against the criteria you set. You review the evidence and decide.
• A skills matrix assessment for your shortlist. Our manufacturing skills matrix and test kit covers blueprint reading, measurement, and mechanical reasoning, the reasoning that predicts whether someone can plan a setup and catch a problem before it turns into scrap.
• A hands-on shop trial for finalists. Put a candidate on a real print and a real piece of stock, from setup to first good part, before you commit to anything longer. Nothing shows real skill and real judgment together the way a trial piece does.

Our resume screening tool handles the first step alongside video, keeping every candidate's resume, video answers, and assessment results in one view instead of scattered documents and phone calls. It doesn't pick for you. It surfaces the evidence so you can.

Common hiring mistakes for this role

Posting for a machinist and hiring an operator, or the reverse. The two roles need different skill levels, and a posting that blurs them either scares off a real machinist who assumes you're underpaying for the setup and programming work, or sets an operator-level hire up to fail on a job that needed someone who could plan from a blank print. Be precise about which job you're actually filling.

Treating CNC hours as proof of manual skill. A candidate who's only ever loaded parts into an already-programmed CNC machine hasn't necessarily developed the manual mill and lathe skill, or the setup judgment, a machinist role needs. Ask about manual time specifically instead of assuming it's covered.

Screening out candidates for a weak resume. Plenty of skilled machinists learned the trade on the floor, not in a way that produces a polished document, and many apply by calling or walking in rather than submitting an application online. Requiring a strong resume filters out people who can hold a tolerance but never learned to write about it.

Posting the job only on LinkedIn. LinkedIn gets little traction for machine shop hiring. Indeed is where most candidates in this trade actually look. If your applicant pool feels thin, check where you're posting before you assume the skilled labor market is the problem.

Moving too slowly on a candidate who can genuinely do the work. The skills gap in this trade is real. A generation of experienced machinists is aging out faster than new ones are trained up, so a candidate who can actually read a print and hold a tolerance usually has more than one shop interested. A process that drags across weeks of back-and-forth loses that candidate to whoever calls back first.

Hiring a narrower production role on the same floor? Our CNC machine operator hiring guide covers the operator role specifically, someone running jobs that are already programmed and set up rather than building the process from a blank print. The two roles sit on the same equipment but need a different hiring bar, and getting the title right on the posting is what gets you the right applicants for each one.