{ "source": "Cooked Index — occupational AI risk register", "page": "https://cookedindex.com/jobs/crushing-grinding-and-polishing-machine-setters-operators-and-tenders/", "methodology": "https://cookedindex.com/methodology", "notice": "Verdicts are re-examined as evidence accumulates. Re-fetch before relying on this; the page above always carries the current score.", "scored_at": "2026-08-11", "model": "claude-opus-5", "occupation": { "title": "Crushing, Grinding, and Polishing Machine Setters, Operators, and Tenders", "soc_code": "51-9021", "category": "Production", "us_employment": 26000, "median_annual_wage": 48540 }, "verdict": "EXPOSED", "risk_resistance": 39, "contested": false, "near_boundary": false, "dimensions": { "task_resistance": 13, "embodiment": 15, "liability_shield": 2, "trust_premium": 3, "judgment_accountability": 6 }, "reasoning": { "task_resistance": "At 13 the split is real: PLC loops and belt scales already handle feed rate, amperage trending, and screen deck monitoring on modern crushing circuits, but nobody has automated unbolting a worn jaw plate, chipping out a bridged rock in a cone crusher, or re-dressing a grinding wheel on an older mill, which keeps this above the low end rather than at 8.", "embodiment": "15 reflects a shift spent in dust, noise, and vibration walking crusher decks and mill floors — lockout/tagout before entering a chute, sledging jams free, hauling liner segments and screen cloth, hosing down fines — in environments where the material itself is unpredictable and the plant layout is not a controlled cell.", "liability_shield": "2 is nearly the floor because no state licenses a crusher operator; MSHA Part 46/48 or OSHA hazard training is required of the employer, not credentialed to you personally, so a plant can put a new hire on the same panel after a week of training.", "trust_premium": "3 acknowledges that the reader may be the person the foreman calls when the tertiary cone starts surging, but the customer buying #57 stone or ground calcium carbonate sees only a gradation certificate and never learns which operator ran the shift.", "judgment_accountability": "6 sits at the top of the procedural band because the calls you make — tightening the closed-side setting when the gradation drifts coarse, slowing the feeder before the mill chokes, pulling a sample for sieve analysis — are real decisions but measured against a written spec and a QC lab that overrides you." }, "rationale": "The work is physical — loading hoppers, adjusting feed rates and screen settings on crushers and mills, clearing jams, changing grinding wheels and liners, sampling product for particle size — and language AI does none of that. The real threat is conventional plant automation: sensor-driven feed control, automated screening, and vision-based quality checks already run mills with fewer tenders, and AI makes those control loops better. Monitoring gauges, logging output, and adjusting to spec are the parts most easily absorbed; no license protects the role and buyers of aggregate or ground pigment do not pay for a human relationship.", "outlook": "Headcount keeps shrinking as plants consolidate control rooms and instrument their circuits, but every mill still needs bodies to clear chokes and swap wear parts — the survivors are the ones who fix the machine, not the ones who watch it.", "what_would_raise_it": { "levers": [ { "dimension": "liability_shield", "change": "MSHA's 2024 final rule on respirable crystalline silica (30 CFR 60) requires mine operators to designate a person to conduct exposure sampling and implement corrective actions; if state or federal rules go further and require a named, certified 'competent person' physically present to authorize crusher/mill restart after a jam, guard removal, or liner change — the way MSHA already requires certified persons for pre-shift examinations in underground mines — the tender role acquires a nameable, personally citable designation rather than an anonymous one", "plausibility": "plausible", "would_add": 4 }, { "dimension": "liability_shield", "change": "In pharmaceutical, food, and pigment milling under FDA 21 CFR 211 cGMP, batch records for particle-size and blend-uniformity steps require a trained, identified operator signature; if FDA data-integrity guidance is extended to bar automated systems from self-certifying particle-size release without a human recorded as performing the verification, the grinding operator becomes a required signer on the batch record", "plausibility": "plausible", "would_add": 3 }, { "dimension": "embodiment", "change": "No rule change needed: the residual work concentrates in the parts automation has not touched — entering crusher chambers to change jaw plates and mill liners, breaking bridged material out of hoppers, rigging and torquing grinding wheels. If lockout/tagout and confined-space entry practice continues to require a physical human inside de-energized equipment (and no liner-change robot reaches aggregate-plant price points), the surviving job is more physical than today's, not less", "plausibility": "already happening", "would_add": 3 }, { "dimension": "task_resistance", "change": "Genuine two-tier structure: gauge-watching, feed-rate trim, and output logging are the automatable tier; setup for a new feedstock or spec, diagnosing why a mill is packing or a screen blinding, and wear-driven judgment about when a liner is done are the judgment tier. If plants continue merging tender duties into a maintenance/millwright-hybrid role — a pattern already visible in aggregate and cement consolidation — the remaining day is disproportionately the diagnostic tier", "plausibility": "already happening", "would_add": 3 }, { "dimension": "judgment_accountability", "change": "If a plant assigns a single named operator authority to reject a batch or stop the line on out-of-spec gradation — as ASTM C33 aggregate certification programs and DOT-approved source certification schemes push toward with a designated certified aggregate technician (e.g. state DOT aggregate technician certification in Indiana, Ohio, Pennsylvania) — the call becomes owned rather than advisory", "plausibility": "plausible", "would_add": 4 } ], "ceiling_note": "No plausible route to trust_premium: buyers of crushed stone, cement clinker, or ground pigment purchase on spec sheet and price, and there is no customer-facing relationship to charge for. Even with every lever above landing, this stays a small, capital-substitutable occupation — plant automation, not language models, sets the headcount, and the levers change the character of the surviving jobs more than the number of them." }, "adjudication": null, "employment_history": { "points": [ { "y": 2017, "emp": 31390, "wage": 35380 }, { "y": 2018, "emp": 31890, "wage": 36400 }, { "y": 2019, "emp": 33360, "wage": 37560 }, { "y": 2020, "emp": 32460, "wage": 39370 }, { "y": 2021, "emp": 31800, "wage": 38760 }, { "y": 2022, "emp": 27320, "wage": 43290 }, { "y": 2023, "emp": 26210, "wage": 44510 }, { "y": 2024, "emp": 28550, "wage": 46890 }, { "y": 2025, "emp": 26000, "wage": 48540 } ], "from": 2017, "to": 2025, "change_pct": -17.2, "comparable_from": 2019, "spans_soc_revision": true }, "pivots": [ { "slug": "electric-motor-power-tool-and-related-repairers", "title": "Electric Motor, Power Tool, and Related Repairers", "verdict": "EXPOSED", "risk_resistance": 60, "median_wage": 56210, "overlap": 65, "skills_to_close": [ "Installation", "Equipment Selection", "Repairing", "Equipment Maintenance" ] }, { "slug": "welders-cutters-solderers-and-brazers", "title": "Welders, Cutters, Solderers, and Brazers", "verdict": "EXPOSED", "risk_resistance": 62, "median_wage": 53750, "overlap": 58, "skills_to_close": [ "Operations Analysis" ] } ], "license": "https://cookedindex.com/terms" }