Career comparison
CNC Machinist vs. Engine Assembler
Side-by-side pay, training, growth and day-to-day duties to help you choose between two related careers.
CNC machinists earn more at the median ($58,750 vs. $53,710), while engine assemblers usually get to work faster (A few months on the job of training). CNC machinists set up and run computer-controlled machines that cut precision metal parts. Engine assemblers build engines, turbines and heavy machines from precision parts.
Pay data: BLS OEWS, May 2025 · Outlook: BLS 2025–35 · Checked October 15, 2026
| CNC Machinist | Engine Assembler | |
|---|---|---|
| Median pay | $58,750 ($28.24/hr) | $53,710 ($25.82/hr) |
| Pay range (10th–90th) | $39,200 – $80,010 | $38,500 – $77,750 |
| Job growth, 2025–35 | +1.0% (slower than average) | -17.0% (a projected decline) |
| Openings per year | 26,100 | 2,100 |
| Typical entry education | High school diploma or equivalent | High school diploma or equivalent |
| Training time | 6–24 months | A few months on the job |
| Key credential | NIMS credentials | Manufacturing certificate |
| Work setting | Machinists work in machine shops and factories. | Assemblers work in engine and equipment plants.. |
What each job does
CNC Machinist
- Read blueprints, GD&T and setup sheets
- Set up CNC mills and lathes, including fixtures, tools and offsets
- Load programs and run machines
- Measure parts with precision instruments and adjust offsets
- Perform first-article and in-process inspections
Engine Assembler
- Read blueprints
- Fit precision parts
- Torque fasteners
- Install bearings and gears
- Measure clearances
How they’re similar
Both careers involve hands-on work, steady routines, and shift work. Both are part of the mechanics, maintenance & manufacturing field, so many skills transfer between them.
Which should you choose?
Choose CNC machinist if…
- I enjoy precise, careful work
- I like math and measurements
- I’m comfortable around machines
Choose engine assembler if…
- I like engines
- I’m precise
- I can follow specs
Still torn? Take the CNC Machinist fit quiz and the Engine Assembler fit quiz, or the full Career Match Quiz.
Quick comparisons
Which pays more, CNC machinist or engine assembler?
CNC Machinists earn more at the median: $58,750 versus $53,710 for engine assemblers, based on BLS May 2025 data.
Which takes less time to train for?
Engine Assemblers typically train faster (A few months on the job) than CNC machinists (6–24 months).
Which career has better job growth?
BLS projects CNC machinists to grow +1.0% from 2025–35, compared with -17.0% for engine assemblers.