How to verify a CNC operator CV — official standards
CNC operator CVs (ISCO 7223, metal working machine tool setters and operators) look interchangeable on paper. Almost every candidate writes "reads blueprints", "Fanuc/Siemens", "tolerances" — but those words carry no evidence. Job titles, machine names and training certificates also differ from country to country, so an international CV is hard to compare against the work you actually need done.
The good news: the substance of the job is standardised. Tolerances and GPS are covered by ISO 2768 (with ISO 22081), fits by ISO 286, geometric tolerancing by ISO 1101 and surface texture by ISO 21920. Programming rests on ISO 6983 G-code, with control-specific dialects. A rigorous check maps each claim in the CV to one of those standards and asks what document proves it. WorkerProof does this automatically and verifies every CV three times.
What a strong CV must contain
A strong CV states which tolerance systems the candidate works with: general tolerances to ISO 2768 (or ISO 22081) and fits to ISO 286, for example H7/g6. Generic wording like "works to tight tolerances" is not evidence.
Look for concrete geometric tolerancing experience — position, concentricity, flatness, datums — referenced to ISO 1101. This separates operators who only run cycles from those who can interpret a controlled drawing.
Surface texture is specified under ISO 21920, the successor of ISO 1302. The CV should show the candidate has worked to specified surface parameters, not just "good finish".
"Read standard blueprints" is an ESCO skill for a computer numerical control machine operator and should be backed by training, an exam or described work: which drawings, which tolerances, which parts.
ISO 6983 is the standardised base language (G00, G01, M-functions), but dialects differ by control. The CV must name the controls actually used — Fanuc, Siemens Sinumerik or Heidenhain — and whether the candidate edits or writes programs at the machine.
Expect the operational ESCO tasks in concrete form: supply the machine, supply it with appropriate tools, monitor automated machines, remove inadequate workpieces, use automatic programming. Diplomas (NPK, vocational diploma, Geselle, Meister) should be placeable on the EQF scale, levels 1–8.
⚠️ Red flags to watch for
Questions to ask the candidate
- 01Which general tolerance standard did your drawings use — ISO 2768 or ISO 22081 — and which tolerance class did you usually work to?
- 02Give an example of a fit to ISO 286 you produced, such as H7/g6, and how you controlled and measured it.
- 03Which ISO 1101 geometric tolerances appeared on your drawings, and how did you handle datums and position tolerances at the machine?
- 04Which surface texture parameters to ISO 21920 were specified on your parts, and how did you verify them?
- 05On which control — Fanuc, Siemens Sinumerik or Heidenhain — did you write or edit ISO 6983 G-code yourself, and which functions did you use most?
The official standards behind the score
WorkerProof checks every CV against this verified matrix.
- ISO 2768 (+ ISO 22081)
- ISO 286 (fits, H7/g6…)
- ISO 1101 (GD&T)
- ISO 21920 (surface texture)
- ISO 6983 (G-code)
- Controls: Fanuc / Siemens / Heidenhain
Frequently asked questions
How do I verify a CNC operator CV against official standards?
Take each technical claim and match it to the standard behind it: tolerances and GPS to ISO 2768 and ISO 22081, fits to ISO 286, geometric tolerancing to ISO 1101, surface texture to ISO 21920, and programming to ISO 6983. Then ask which document or work example proves the claim. WorkerProof runs this check automatically and verifies each CV three times.
Which ISO standards should a CNC operator CV mention?
For precision work: ISO 2768 (with ISO 22081) for general tolerances, ISO 286 for fits such as H7/g6, ISO 1101 for GD&T and ISO 21920 for surface texture. For programming: ISO 6983 G-code, plus the specific control used — Fanuc, Siemens or Heidenhain.
What is the difference between a CNC operator and a CNC programmer?
ISO 6983 is the standardised base language of CNC controls, with dialects that differ by control. Writing and editing programs at the machine is the boundary between operator and programmer, so ask directly whether the candidate wrote programs, edited them or only ran existing ones.
How do I compare foreign CNC qualifications?
The European Qualifications Framework (EQF, levels 1–8) makes national diplomas comparable: a Slovenian NPK or vocational diploma, a German Geselle (EQF 4) or Meister (EQF 6) can be placed on one scale. WorkerProof verifies the documents and claims presented; it does not grant or confirm legal recognition of a qualification.
Does a CNC operator need a welding qualification?
Only if the role includes mechanised or automatic welding equipment such as robots, SAW tractors or orbital TIG — that work is covered by ISO 14732. It is distinct from hand-welder qualification EN ISO 9606, so check which one the certificate actually is.
Stop guessing. Verify.
Upload a CV and get a scored, 3×-verified report against these exact standards in minutes.
Analyze a CV free →