Precision Machinist Job Description
American manufacturers report that 45% of job applicants for skilled machinist positions lack the technical qualifications to operate production CNC equipment — yet the demand for machinists who can program 5-axis mills, set up Swiss-type lathes, and hold aerospace tolerances on superalloys is growing as reshoring accelerates and the existing workforce ages past retirement [1].
Key Takeaways
- Precision machinists set up, program, and operate CNC equipment to produce metal components within tight dimensional tolerances (±0.0001" to ±0.005")
- The role requires reading engineering drawings with GD&T per ASME Y14.5, selecting cutting tools and parameters, and performing in-process inspection
- Work environments range from climate-controlled aerospace clean rooms to general job shops, with most positions requiring standing for 8-10 hour shifts
- Median pay is $48,740 nationally, but precision specialists in aerospace and medical device sectors earn $70,000-$110,000+
- Career advancement paths include CNC programming, manufacturing engineering, quality engineering, applications engineering, and shop ownership
Core Responsibilities
1. CNC Machine Setup and Operation
Precision machinists set up CNC milling machines, lathes, and specialty equipment (EDM, grinding) by interpreting engineering drawings, selecting and installing tooling, establishing work coordinates, loading programs, and running first articles to verify dimensional conformance. Setup work includes indicating fixtures with dial indicators to within ±0.0001", presetting tools in offline presetters, and verifying program parameters against setup sheets [2].
2. G-code Programming and CAM Toolpath Development
Advanced machinists write and edit G-code programs at the machine controller for simple operations and develop complex toolpaths using CAM software (Mastercam, Fusion 360, ESPRIT, NX CAM) for multi-axis and production work. Programming responsibilities include toolpath strategy selection, feeds and speeds calculation based on material and tool specifications, simulation and verification, and post-processing for specific machine controllers (Fanuc, Siemens, Heidenhain, Haas).
3. Blueprint and GD&T Interpretation
Reading engineering drawings with geometric dimensioning and tolerancing (GD&T) callouts per ASME Y14.5-2018. This includes interpreting datum reference frames, position tolerances, profile tolerances, runout, concentricity, and composite feature control frames. Understanding the drawing is the prerequisite to every other machining task.
4. In-Process and Final Inspection
Performing dimensional inspection using precision measurement instruments: micrometers (0-6"), dial/digital calipers, bore gauges, pin gauges, thread gauges, height gauges, dial indicators, and optical comparators. For critical features, operating coordinate measuring machines (CMMs) — Zeiss, Mitutoyo, Hexagon — to verify complex geometry against 3D CAD models. Documenting inspection results on SPC charts and first article inspection (FAI) reports per AS9102.
5. Process Optimization
Analyzing machining processes to improve cycle time, tool life, surface finish, and dimensional consistency. This includes adjusting feeds and speeds based on material response, evaluating cutting tool geometry and coatings, modifying toolpath strategies (trochoidal milling, high-speed machining, constant chip load), and implementing in-process gauging or probing routines.
6. Fixture Design and Fabrication
Designing and building workholding fixtures for production and prototype work. This may include soft jaw machining, tombstone and pallet fixtures, vacuum fixtures, custom clamps, and hydraulic or pneumatic workholding. Proper fixturing directly determines part accuracy, cycle time, and operator safety.
7. Tool Selection and Management
Selecting cutting tools (end mills, inserts, drills, reamers, taps, form tools) based on material, geometry, tolerance, and surface finish requirements. Managing tool inventory, monitoring tool wear, and establishing tool change intervals. Knowledge of tool material grades (carbide, HSS, ceramic, CBN, PCD) and coatings (TiAlN, AlCrN, DLC) for specific material applications.
8. Quality System Compliance
Operating within quality management system requirements (AS9100 Rev D for aerospace, ISO 13485 for medical devices, ISO 9001 for general quality). This includes following documented work instructions, maintaining traceability records, participating in corrective action processes (8D, root cause analysis), and supporting internal and external audits.
Qualifications
Required
- High school diploma or equivalent
- 2+ years of CNC machining experience (setup and operation)
- Ability to read and interpret engineering drawings with GD&T
- Proficiency with precision measurement instruments (micrometers, calipers, gauges)
- Basic G-code knowledge and ability to edit programs at the controller
- Understanding of cutting tool selection and speeds/feeds for common materials
- Physical ability to stand for extended periods, lift up to 50 lbs, and work in a manufacturing environment
Preferred
- Associate degree or certificate in CNC Machining Technology or Machine Tool Technology
- NIMS certifications (CNC Milling, CNC Turning, Multi-Axis)
- CAM software proficiency (Mastercam, Fusion 360, ESPRIT, or equivalent)
- 5-axis machining experience (setup, programming, and operation)
- Experience with exotic alloys (titanium, Inconel, Hastelloy, cobalt-chrome)
- CMM operation experience (Zeiss, Mitutoyo, Hexagon)
- Quality system experience (AS9100, ISO 13485, ISO 9001)
- DOL-registered apprenticeship completion
Work Environment
**Physical Setting**: CNC machine shops range from modern, climate-controlled aerospace facilities with cleanroom-adjacent conditions to general-purpose job shops. Machinists work around rotating machinery, cutting fluids (water-soluble coolants, neat oils), metal chips, and noise levels requiring hearing protection (typically 85-95 dBA) [3]. **Schedule**: Most shops operate day shift (6:00 AM - 2:30 PM or 7:00 AM - 3:30 PM) and second shift (2:30 PM - 11:00 PM). Some operations run third shift. Overtime of 5-15 hours/week is common in many shops, with extended overtime during production surges. **Physical Demands**: Standing for 8-10 hours, lifting workpieces and fixtures up to 50 lbs (overhead crane assist for heavier items), repetitive hand motions for deburring and inspection, and sustained visual focus for precision measurement. Machine shop environments require steel-toed boots, safety glasses, and hearing protection. **Safety**: CNC machining involves rotating cutting tools, flying chips, pressurized coolant, and heavy workpieces. Proper machine guarding, lockout/tagout procedures, and PPE compliance are essential. Shops operating under OSHA regulations maintain documented safety programs.
Career Growth Opportunities
**Within the Trade**: Operator → Setup Machinist → Precision Machinist → CNC Programmer → Department Lead → Shop Manager. Each progression increases both responsibility and compensation. **Into Engineering**: Manufacturing Engineer, Process Engineer, Quality Engineer, Tooling Engineer. These transitions typically require additional education (associate or bachelor's degree) but leverage deep machining knowledge. **Into Technical Sales**: Applications Engineer (machine tool or cutting tool manufacturer), Technical Sales Representative, Field Service Engineer. These roles combine machining expertise with customer-facing skills. **Into Business**: Machine shop ownership is a realistic path for experienced machinists. Many successful shop owners started with a single CNC machine and grew through reputation, reinvestment, and specialization.
Salary Information
| Role Level | Annual Range | Key Differentiators |
|---|---|---|
| CNC Operator | $33,000-$46,000 | Basic operation, loading/unloading |
| Setup Machinist | $46,000-$62,000 | Independent setup, basic programming |
| Precision Machinist | $58,000-$79,000 | Tight tolerances, exotic materials |
| CNC Programmer | $62,000-$87,000 | CAM software, multi-axis programming |
| Swiss Specialist | $67,000-$94,000 | Swiss-type lathe expertise |
| Lead / Supervisor | $79,000-$110,000 | Department management, training |
| Additional compensation: overtime (significant — $15,000-$30,000/year at many shops), shift differential ($1-$4/hour for 2nd/3rd shift), signing bonuses ($3,000-$15,000 in high-demand markets) [1]. | ||
| ## Final Takeaways | ||
| Precision machining is a career where the gap between entry-level and expert-level compensation is enormous — and the gap is determined entirely by skill. A machinist who can program 5-axis simultaneous toolpaths, process exotic superalloys, and lead a CNC department is not doing the same job as a CNC operator pressing cycle start, even though both work in machine shops. The job description above represents the skilled end of the spectrum — the positions where manufacturing employers are most desperate and most willing to pay premium wages. | ||
| ## Frequently Asked Questions | ||
| ### What is the difference between a CNC operator and a precision machinist? | ||
| A CNC operator loads material, presses cycle start, monitors the machine, and performs basic deburring and inspection. A precision machinist independently sets up machines, edits or writes programs, selects tooling, solves machining problems, and produces parts within tight tolerances. The distinction is between operating a machine and mastering it. | ||
| ### Is precision machining physically demanding? | ||
| Moderately. Machinists stand for 8-10 hours, lift workpieces and fixtures (typically under 50 lbs, with crane assist for heavier items), and perform repetitive hand motions for deburring and inspection. It is not as physically demanding as construction trades but requires sustained physical presence and manual dexterity [3]. | ||
| ### Do precision machinists need to travel? | ||
| Rarely, unless employed as applications engineers or field service technicians for machine tool companies. Shop-based machinists work at a fixed location. Some prototype machinists may travel for on-site installation or assembly work. | ||
| ### What industries hire precision machinists? | ||
| Aerospace (Boeing, Raytheon, Pratt & Whitney, SpaceX), medical devices (Medtronic, Stryker, Zimmer Biomet), defense (Lockheed Martin, General Dynamics), automotive (tier suppliers), oil and gas (valve and fitting manufacturers), semiconductor equipment (Applied Materials, ASML), and general precision job shops serving multiple industries [1]. | ||
| ### Is prior military machinist experience valued? | ||
| Yes. Military machinists (MOS 91E, Navy MM, Air Force 2A6X1) have experience with precision equipment maintenance and fabrication under demanding quality standards. Military machining experience transfers directly to civilian manufacturing roles, and many employers actively recruit veterans with machining backgrounds. | ||
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| **Citations:** | ||
| [1] Bureau of Labor Statistics, "Occupational Outlook Handbook: Machinists," SOC 51-4041, 2024. | ||
| [2] National Tooling and Machining Association, "Machinist Job Profile and Industry Standards," 2024. | ||
| [3] OSHA, "Machine Shop Safety Standards and Guidelines," 29 CFR 1910. |