NIMS CNC exam-day guide
NIMS CNC · Prepare for the day ahead.
Your checklist
Government-issued photo ID
Bring the ID whose name matches your registration exactly. Confirm with the provider which forms of ID are accepted and whether a second form is required.
Provider-issued exam packet (drawing, job plan, inspection forms)
Many sites hand the part print and planning/inspection documents to you at check-in. Confirm with the provider whether anything must be printed and brought by you.
Personal measuring tools
Typical kit: 0-1 in and 1-2 in outside micrometers, dial or digital calipers, 6 in steel rule, deburring tool, edge finder/indicator as allowed. Confirm with the provider which tools the site supplies and which you must bring.
Safety glasses and shop-appropriate clothing
Z87-rated eye protection, closed-toe shoes, no loose sleeves, no jewelry or gloves near rotating tools, hair secured. Confirm any site-specific hearing protection or footwear requirement.
Calculator and pencil/paper
Useful for speeds, feeds, and trig. Confirm with the provider whether calculators are permitted and whether programmable or phone-based calculators are prohibited.
Reference material for G-code and control operation
Ask the provider in advance what reference material, if any, is allowed at the machine. Do not assume notes or control manuals are permitted.
Confirmation of control type and machine
Ask which CNC control and machine you will run so you can practice that interface beforehand. Do not assume it matches your shop's equipment.
Confirmation of the time limit and what it covers
Find out whether the clock includes print reading, setup, programming, tool changes, and final inspection, and whether any breaks stop the clock. Confirm with the provider.
Logistics confirmed: address, arrival time, parking, check-in
Plan to arrive at least 30 minutes early. Confirm the check-in process and any site access or escort requirements with the provider.
Verification that your measuring tools are in calibration
Zero your micrometers and check calipers against a known standard or gauge block before the exam. A reading instrument that is out of adjustment will cost you dimensional points.
Rehearsed work sequence and inspection plan
Before exam day, write out your own order of operations: stock prep, datum/fixture, tool list, speeds and feeds, feature sequence, in-process checks. Practice it end to end at least once.
Water, snack, and any medication
Practical sessions run long. Confirm with the provider whether food and drink are allowed in the test area or only outside it.
Plan the day
Review the duty checklist for your specific credential (job planning, setup, operation, inspection, safety) and note weak areas. Run a full practice part start to finish on a similar control, including documenting in-process measurements. Gather and verify your tools; zero/check mics and calipers. Confirm machine, control, time limit, and address with the provider.
Pack your tool bag and ID, lay out clothing, and re-read your own work sequence and inspection plan. Do not start learning new controls or codes. Confirm your travel plan and get a full night's sleep - fatigue causes more dimensional and safety errors than lack of knowledge.
Eat a real meal. Arrive 30 minutes early, complete check-in, present ID, and set up your measuring tools at the bench. Listen carefully to the safety briefing and ask only procedural questions. Read the entire drawing and job plan before touching the machine; identify datums, critical tolerances, and the features most likely to move.
Verify stock size, plan your setup and workholding, and confirm your tool list and offsets. Perform and verbalize safety checks. Do not rush the setup; a bad datum or loose vise ruins every feature that follows.
Run the planned sequence, checking critical features in-process rather than only at the end. Record measurements as you take them. Keep the machine area clear, tools off the ways, and the door closed when running. If something is out of tolerance, stop and diagnose before continuing.
Reserve the last stretch for deburring, final inspection of every specified dimension, and completing your inspection record. Verify surface finish and any chamfers or radii called out. Leave the machine and bench clean. Hand in documentation as instructed and be ready to explain your setup and inspection decisions to the evaluator.
Rules to check
Bring valid government-issued photo ID; the name must match your registration. Confirm with the provider which forms of identification are accepted.
Follow all site safety rules at all times. Eye protection is required in the shop area, and an evaluator may stop your test for an unsafe act - treat safety as a scored element, not a formality.
Use only the tools, reference material, and devices the provider permits. Do not assume phones, notes, or control manuals are allowed; ask before the test begins.
Work independently. Do not accept coaching, hints, or assistance from anyone other than the evaluator, and only ask questions the provider's rules permit.
Confirm the break policy with the provider before you begin. Do not assume the clock stops for breaks or that extra time is granted for interruptions.
If a machine, tool, or instrument fails, stop and notify the evaluator immediately. Do not attempt repairs or workarounds beyond what you are authorized and trained to do.
Expect to be evaluated on more than the finished part - planning, setup, safety, and inspection documentation are typically part of the assessment. Confirm the scoring criteria and pass standard with the provider.
Report any injury, near-miss, or damaged tooling immediately, even if it seems minor. Concealing an incident is a conduct issue in its own right.