# Crushing, Grinding, and Polishing Machine Setters, Operators, and Tenders > Set up, operate, or tend machines to crush, grind, or polish materials, such as coal, glass, grain, stone, food, or rubber. - Code: 51-9021.00 (O*NET-SOC; SOC 2018 51-9021) - Family: [Production](https://foundation.org.ai/occupations#family-51), one of its 114 occupations - Tasks: 21 tasks (13 core and 8 supplemental) - Page: https://foundation.org.ai/occupations/51-9021.00 - JSON: https://foundation.org.ai/data/tasks/51-9021.00.json ## What the work is made of 1. Observe operation of equipment to ensure continuity of flow, safety, and efficient operation, and to detect malfunctions. Core task · Task 12376 · Rated by 49 people who do the job, August 2024 2. Clean, adjust, and maintain equipment, using hand tools. Core task · Task 12381 · Rated by 47 people who do the job, August 2024 3. Tend accessory equipment, such as pumps and conveyors, to move materials or ingredients through production processes. Core task · Task 12389 · Rated by 49 people who do the job, August 2024 4. Move controls to start, stop, or adjust machinery and equipment that crushes, grinds, polishes, or blends materials. Core task · Task 12377 · Rated by 47 people who do the job, August 2024 5. Notify supervisors of needed repairs. Core task · Task 12382 · Rated by 46 people who do the job, August 2024 6. Weigh or measure materials, ingredients, or products at specified intervals to ensure conformance to requirements. Core task · Task 12380 · Rated by 49 people who do the job, August 2024 7. Record data from operations, testing, and production on specified forms. Core task · Task 12378 · Rated by 49 people who do the job, August 2024 8. Reject defective products and readjust equipment to eliminate problems. Core task · Task 12384 · Rated by 46 people who do the job, August 2024 9. Inspect chains, belts, or scrolls for signs of wear. Core task · Task 12388 · Rated by 47 people who do the job, August 2024 10. Clean work areas. Core task · Task 12385 · Rated by 47 people who do the job, August 2024 11. Examine materials, ingredients, or products, visually or with hands, to ensure conformance to established standards. Core task · Task 12379 · Rated by 46 people who do the job, August 2024 12. Read work orders to determine production specifications and information. Core task · Task 12375 · Rated by 49 people who do the job, August 2024 13. Dislodge and clear jammed materials or other items from machinery and equipment, using hand tools. Core task · Task 12387 · Rated by 47 people who do the job, August 2024 14. Test samples of materials or products to ensure compliance with specifications, using test equipment. Supplemental task · Task 12390 · Rated by 46 people who do the job, August 2024 15. Mark bins as to types of mixtures stored. Supplemental task · Task 12392 · Rated by 46 people who do the job, August 2024 16. Transfer materials, supplies, and products between work areas, using moving equipment and hand tools. Supplemental task · Task 12386 · Rated by 46 people who do the job, August 2024 17. Add or mix chemicals and ingredients for processing, using hand tools or other devices. Supplemental task · Task 12395 · Rated by 46 people who do the job, August 2024 18. Collect samples of materials or products for laboratory testing. Supplemental task · Task 12391 · Rated by 48 people who do the job, August 2024 19. Load materials into machinery and equipment, using hand tools. Supplemental task · Task 12394 · Rated by 46 people who do the job, August 2024 20. Turn valves to regulate the moisture contents of materials. Supplemental task · Task 12393 · Rated by 47 people who do the job, August 2024 21. Set mill gauges to specified fineness of grind. 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