CNC Machine Operator
manufacturing › Machine Shop · S2 — S2 — Support Specialist · Support
Operates computer-controlled machining equipment to produce parts according to specifications under routine supervision.
Median pay · United States · annual
$44,288 USD
▲ +15% vs S1 on this ladder
Typical range ()
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What this role is
Operates computer-controlled machining equipment to produce parts according to specifications under routine supervision. At the Support Specialist (S2) level, the role owns a defined queue or customer set, standard issues within known procedures, and drives customer satisfaction for own queue. None.
What this level does
- Sets up basic machining jobs on CNC milling and turning centers from setup sheets and verbal instructions from senior employees, loading tools, setting work offsets, and touching off
- Runs a range of machines through a production shift, recognizing when a part is trending out of tolerance and making the routine offset or speed/feed adjustment to correct it
- Performs detailed quality inspections against blueprints using calipers, micrometers, height gauges, and bore gauges, and records measured values on inspection sheets
- Reports recurring dimensional drift or tooling problems to senior machinists and knows when a deviation requires escalation rather than a self-adjustment
- Knowledge applied
- Broad knowledge of CNC control operation and inspection tooling; sets up basic jobs from setup sheets and carries out varied multi-step machining tasks.
- Complexity & problem solving
- Semi-routine tasks; recognizes when a dimension is drifting and makes the routine offset or parameter adjustment, escalating anything outside the standard fix.
- Collaboration & interaction
- Routine peer interaction on the floor; takes verbal direction from senior machinists and records inspection results for others.
- Typical experience
- 1–2 years; some related production machining experience.
Skills at this level
- CNC Machine Operation
- — Operates CNC milling and turning centers from setup sheets — loading tools, setting work offsets, touching off, and running production jobs to blueprint dimensions.
- CNC Programming and Code Editing
- — Programs and modifies CNC G-code at the control, setting speeds, feeds, tool paths, and work-holding using knowledge of math, tooling, and how materials react to stress and heat.
- Wear Offset Adjustment
- — Reads a part's measured dimension against the print and adjusts wear offsets in the machine control to bring the feature back to target during a run.
- Blueprint and Specification Interpretation
- — Interprets technical blueprints, models, and GD&T specifications to determine the dimensions, tolerances, and features a machined part must meet.
- Dimensional Inspection
- — Performs detailed quality inspections using calipers, micrometers, height gauges, bore gauges, and go/no-go pins, verifying parts to tolerances sometimes within .0001 of an inch.
- Machine Setup and Work-Holding
- — Selects and configures fixtures, chucks, vises, and tooling to hold a part rigidly and locate it correctly for the machining operation.
- Manual Machining
- — Operates manual mills, lathes, grinders, and other machine tools to cut and finish metal parts where a manual operation is faster or more appropriate than CNC.
- Machining Troubleshooting
- — Diagnoses in-process problems — chatter, tool breakage, poor surface finish, dimensional drift — and determines the tooling, fixturing, or parameter change that corrects them.
- Tooling and Cutting Parameter Selection
- — Chooses cutting tools, inserts, coolant, speeds, and feeds appropriate to the material and geometry to hold tolerance and maximize tool life.
- Root-Cause Analysis of Production Problems
- — Finds the underlying cause of recurring scrap or process failures on the floor and recommends work-holding, tooling, or method changes to prevent recurrence.
- Machining Process Improvement
- — Applies lean manufacturing and Six Sigma techniques to reduce cycle time, scrap, and rework across families of machined parts.
- Setup Procedure Development
- — Develops and proves out machining methods and setup sheets for complex geometries and tight-tolerance 5-axis work so that others can repeat the job reliably.
- Shop Floor Mentoring
- — Guides and trains less experienced machinists through difficult setups and troubleshooting, and coordinates work across the machine shop as a working lead.
- Preventive Maintenance and Tooling Inventory
- — Maintains machine condition through routine preventive maintenance and manages the shop's tooling inventory to keep production running.
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As of · 2026-07-30
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