CNC Mill Operator (Computer Numerical Control Mill Operator)
Computer Numerically Controlled Tool OperatorsDescription
Set up and operate CNC milling machines to cut, drill, and finish parts per blueprints and programs. Load and verify tooling and workholding, set offsets, monitor cycles, and adjust feeds, speeds, and tool paths to meet quality and safety standards. May also perform basic programming, troubleshooting, and preventive maintenance.
- • Measure finished and in-process dimensions using calipers, micrometers, indicators, and gauges.
- • Remove and replace dull or broken end mills, drills, and inserts.
- • Mount and align vises, fixtures, rotary tables, and workpieces on CNC mills.
- • Listen for chatter, vibration, or abnormal sounds and make corrective adjustments.
- • Adjust feeds, speeds, depth of cut, and tool offsets to correct issues or improve quality.
- • Stop machines to remove parts, change tools, or modify setups per sequence.
- • Lift and secure raw stock or fixtures using hoists or cranes as needed.
- • Edit G-code at the control to resolve problems and save revised programs.
- • Calculate spindle speeds and feed rates, stepovers, and cut locations.
- • Load programs and set work and tool offsets to start operations.
- • Verify coolant flow and lubrication; maintain proper coolant concentration.
- • Enter initial dimensions and offsets into the control.
- • Set up and run CNC vertical or horizontal mills to rough and finish parts.
- • Coordinate with supervisors, programmers, or quality to resolve issues.
- • Read blueprints and GD&T to determine operations, sequences, and tolerances.
- • Monitor cycle status, spindle load, and control displays to detect malfunctions.
- • Control coolant, air blast, and chip evacuation during machining.
- • Perform basic maintenance and replace worn toolholders or pull studs.
- • Stage, deburr, and move finished parts to the next operation or area.
- • Clean machines, tooling, and work areas; remove chips.
- • Load programs via USB or DNC and retrieve stored instructions.
- • Transfer programs over the network to CNC controls as required.
- • Prepare tools and fixtures for upcoming jobs while machines run.
- • Implement program changes and enter new specifications using CAM or control.
- • Write simple mill programs or conversational cycles for drilling, facing, or pocketing.
- • Set work and tool lengths using edge finders, touch probes, or tool setters.
- • Perform first-article and in-process inspections and record results.
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Advanced Manufacturing
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Last reviewed: Jan 2026
