{ "source": "Cooked Index — occupational AI risk register", "page": "https://cookedindex.com/jobs/grinding-lapping-polishing-and-buffing-machine-tool-setters-operators-and-tenders-metal-and-plastic/", "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": "Grinding, Lapping, Polishing, and Buffing Machine Tool Setters, Operators, and Tenders, Metal and Plastic", "soc_code": "51-4033", "category": "Production", "us_employment": 67000, "median_annual_wage": 46550 }, "verdict": "EXPOSED", "risk_resistance": 36, "contested": false, "near_boundary": false, "dimensions": { "task_resistance": 13, "embodiment": 13, "liability_shield": 1, "trust_premium": 3, "judgment_accountability": 6 }, "reasoning": { "task_resistance": "Dressing a wheel to the right form, sneaking up on a 0.0002-inch bore size, and reading burn marks or chatter patterns on a part cannot be done from a keyboard, but repeat-run tending on a CNC grinder with in-process gauging is already automated in high-volume shops — that split between irreplaceable setup and replaceable cycle-start puts it at 13 rather than 17.", "embodiment": "You are standing at the machine mounting wheels, balancing them, flooding coolant, loading fixtures, and hand-deburring with files and stones — but it is a shop floor with fixed equipment and known part flow, not a rooftop or a trench, so it lands at 13 rather than the high teens.", "liability_shield": "Nothing about this job requires a licence: no state credential to run a surface grinder, and when a part goes out of tolerance the quality inspector's signoff and the shop's certification (AS9100, ISO) absorb it, not your name.", "trust_premium": "Your ground parts leave in a tote with a first-article report attached; the customer buys the tolerance and the surface finish and never learns who set the machine, though a lead who consistently makes tough jobs run gets asked for by the scheduler.", "judgment_accountability": "Feeds, speeds, wheel grit, and dress amounts come off a process sheet or the setup sheet from engineering, and print tolerances define pass/fail — the discretion is real when you compensate for a taper or change dress frequency mid-run, but you are not deciding whether the part design is acceptable." }, "rationale": "The daily work — mounting wheels and abrasives, dialing in feeds and speeds, loading parts, checking dimensions with micrometers and gauges, deburring and finishing by feel — is hands-on and resists language AI almost entirely. The real threat here is not chatbots but the machinery itself: CNC grinders with in-process gauging, automatic wheel dressing, and robot part loading have been eating the tending tier for decades, and employment has trended down accordingly. Setters who can hold tight tolerances on unfamiliar geometries and troubleshoot chatter, burn, and taper keep their value; someone who loads a part and presses cycle-start does not.", "outlook": "Headcount keeps shrinking as automated grinding cells absorb the repetitive volume work, while a smaller core of setup-and-troubleshooting specialists in tight-tolerance shops stays in demand and gets paid more.", "what_would_raise_it": { "levers": [ { "dimension": "task_resistance", "change": "Task-mix shift is genuine here: this occupation has a clear two-tier structure. If the load/unload/cycle-start tier is fully absorbed by robot cells and in-process gauging, the surviving population is setters who dial in unfamiliar geometries, diagnose chatter/burn/taper, dress and select abrasives for exotic alloys, and hand-finish blend repairs on aero and medical parts. Watch for headcount falling while the remaining job titles shift to 'grind technician' or 'process setter' — the register score for the residual role rises even as employment shrinks.", "plausibility": "already happening", "would_add": 4 }, { "dimension": "embodiment", "change": "If demand concentrates in low-volume, high-mix work — turbine blade tip and blend grinding, orthopedic implant polishing, weld-repair blending on castings — where fixturing is one-off and the surface is judged by feel and light, the physical component becomes harder to automate than pallet-fed production grinding. MRO and aerospace repair segments (e.g. blade repair shops) already work this way.", "plausibility": "plausible", "would_add": 3 }, { "dimension": "liability_shield", "change": "Nadcap/AMS2431-style special-process accreditation for grinding on flight-critical parts already requires a named, qualified operator on the process certification and burn/temper etch approvals. If primes extend operator-level qualification and personal signoff on abusive-grinding inspection to more part classes — or FDA implant surface-finish records require a named finisher — a thin shield forms. It stays thin: the signature is on process conformance, not personal professional liability.", "plausibility": "plausible", "would_add": 3 }, { "dimension": "judgment_accountability", "change": "If the scrap decision moves to the setter rather than QA — deciding whether a $40k forging with visible burn is reworkable, or whether taper is fixture-induced or spindle-induced before a shop stops the line — the role owns consequential calls. Watch for shops formally granting setters rework/scrap disposition authority, common in aerospace MRO cells.", "plausibility": "plausible", "would_add": 4 } ], "ceiling_note": "No realistic route to a trust premium: buyers of ground parts specify Ra and tolerance, not who held the part. There is no consumer-facing 'hand-finished' market at scale outside niche firearms, knives, and restoration work. Even with every lever, the machinery threat is independent of AI capability and has been reducing headcount for thirty years; the score can rise while the occupation keeps shrinking." }, "adjudication": { "method": "two independent runs agreed on the verdict", "outcome": "corroborated", "run_totals": [ 36, 38 ], "run_verdicts": [ "EXPOSED", "EXPOSED" ] }, "employment_history": { "points": [ { "y": 2017, "emp": 74600, "wage": 33480 }, { "y": 2018, "emp": 71870, "wage": 34850 }, { "y": 2019, "emp": 76810, "wage": 36100 }, { "y": 2020, "emp": 69570, "wage": 36880 }, { "y": 2021, "emp": 67750, "wage": 37550 }, { "y": 2022, "emp": 73800, "wage": 38910 }, { "y": 2023, "emp": 75260, "wage": 42610 }, { "y": 2024, "emp": 70110, "wage": 45190 }, { "y": 2025, "emp": 67000, "wage": 46550 } ], "from": 2017, "to": 2025, "change_pct": -10.2, "comparable_from": 2019, "spans_soc_revision": true }, "pivots": [ { "slug": "refractory-materials-repairers-except-brickmasons", "title": "Refractory Materials Repairers, Except Brickmasons", "verdict": "EXPOSED", "risk_resistance": 65, "median_wage": 61290, "overlap": 83, "skills_to_close": [ "Repairing" ] }, { "slug": "welders-cutters-solderers-and-brazers", "title": "Welders, Cutters, Solderers, and Brazers", "verdict": "EXPOSED", "risk_resistance": 62, "median_wage": 53750, "overlap": 78, "skills_to_close": [] }, { "slug": "crane-and-tower-operators", "title": "Crane and Tower Operators", "verdict": "SAFE", "risk_resistance": 67, "median_wage": 68080, "overlap": 77, "skills_to_close": [] } ], "license": "https://cookedindex.com/terms" }