Crushing, grinding, and polishing machine operators Crushing, Grinding, and Polishing Machine Setters, Operators, and Tenders
Occupation code: 51-9021（SOC） Not a skilled migration occupation Overall 6.4/10
Operate or tend crushing, grinding, and polishing machinery to process materials such as coal, glass, grain, stone, food, or rubber.
Ratings · Overall 6.4/10i
In the AI era: what happens to Crushing, grinding, and polishing machine operators
Many procedural and repetitive tasks in this occupation (e.g., input control, equipment adjustment, quality monitoring) are easily replaced by automated systems, so job demand will continue to shrink. Existing operators need to transition toward equipment maintenance and anomaly handling.
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Replaces operators' real-time monitoring and adjustment tasks for crushers and grinders, using sensors and AI algorithms to automatically control parameters, reducing manual intervention.
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Replaces operators in parameter setting, fault diagnosis, and daily monitoring of grinding and polishing machines, reducing manual operation through automation logic.
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Replaces operator monitoring and predictive maintenance of equipment status, using AI to analyze sensor data and automatically adjust operations, reducing manual inspections
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Partially replaces operator tasks for starting, stopping, and adjusting speed of grinding and polishing machines, executed automatically via preset programs.
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Replacing operator tasks of crusher load adjustment and grinding fineness control through AI automatic parameter optimization and anomaly alerts.
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- Automatically adjust crushing or grinding parameters (e.g., speed, pressure) based on material type, without manual repeated adjustments
- Monitors material dimensions in real-time via sensors and automatically starts/stops conveyors, replacing manual inspection
- Uses machine vision systems to detect surface defects in finished products, replacing manual visual inspection
- Automatically records production, energy consumption, and fault alarm data, replacing manual report entry
- Remote operation consoles control multiple devices centrally, reducing on-site staffing.
- Use AI predictive maintenance systems to detect equipment wear early and schedule repairs, reducing unplanned downtime
- Analyze historical data through process optimization software to recommend optimal operating parameters, improving output efficiency.
- AI-assisted training simulators help operators quickly master new equipment operations
- Smart reporting systems automatically aggregate multi-device data to assist production scheduling decisions
- On-site diagnosis and hands-on repair ability for sudden equipment failures (e.g., jamming, mechanical deformation).
- Experience in process adjustments for non-standard materials (e.g., abnormal moisture, impurities)
- On-site management skills for coordinating communication with upstream and downstream production lines
- Experience in repairing old or customized non-standard equipment that cannot be easily standardized
- Basic industrial robot programming and troubleshooting
- Basic debugging of PLC (Programmable Logic Controller)
- Data collection and SCADA system operation
- Hydraulic/pneumatic system repair
- Lean production and continuous improvement methods
- Basic English (for reading equipment manuals)
Entry-level roles (e.g., machine minders with no skill requirements) will significantly decline, as automated control systems can monitor multiple machines simultaneously, reducing the need for junior operators.
It is recommended to transition to equipment maintenance technician or production line automation engineer. In the short term, learn PLC, sensor wiring, and basic programming; in the medium term, master industrial robots and MES system operation; in the long term, advance to automated production line supervisor, responsible for multi-device integration and optimization.
Salary
| Experience | Annual (USD) | |
|---|---|---|
| Entry level (0–3 years) | $28,000 ~ $35,000 | Entry-level |
| Mid-level (3–8 years) | $35,000 ~ $45,000 | After gaining experience |
| Senior (8+ years) | $45,000 ~ $55,000 | Senior or supervisor level |
Education Path
| Stage | Duration | Cost (USD) |
|---|---|---|
| High school diploma or equivalent | 4 years | $0~$0 |
| On-the-job training | A few months to 1 year. | $0~$5,000 |
Qualifications
| Qualification | Issuer | |
|---|---|---|
| High school diploma or equivalent | School | Required |
| On-the-job training | Employer | Required |
Migration
Not a skilled migration occupation. Visa pathways depend on matching the specific duties to the right petition category; refer to the latest USCIS rules and the relevant category.
Who it fits
- People who like hands-on machine operation and value safety
- People who can adapt to repetitive work and have good physical fitness
- Seeking stable blue-collar work without requiring a high degree
- People pursuing high salary and high return on education
- People who want rapid promotion or creative work
Career outlook
Start as a junior operator, gain experience, and advance to senior operator or supervisor. Some move to equipment maintenance or quality control roles.
Projected employment growth of about 3% from 2023 to 2033, about average for all occupations. Automation may affect some positions, but demand in manufacturing and recycling industries remains stable.
Growth areas：
AutomationRecyclingManufacturingMaterial Processing
FAQ
Data sources
Salary ranges are estimates aggregated from public listings on Indeed, Glassdoor, ERI SalaryExpert and the U.S. Bureau of Labor Statistics (BLS OEWS); employment and demand outlook cite the BLS Occupational Outlook and O*NET; visa and migration details follow the latest USCIS work-visa (H-1B / O-1 / L-1) and employment-based green-card (EB-2 / EB-3, incl. DOL PERM labor certification) rules. Figures are indicative only — always refer to the latest official sources.