Two phases, two different cases
A machine injuring an operator during production is a guarding question. The hazard was present in normal running, and something should have prevented a person reaching it.
A machine injuring someone during maintenance, cleaning or jam clearance is an energy isolation question. The hazard existed because the machine could still move, and something should have made that impossible.
Establishing which phase the work was in is the first thing worth settling, because it determines which standard applied, which records matter, and who was responsible for what.
Guarding — what the standard actually requires
Under 29 CFR 1910.212 machines must be guarded to protect operators and others from hazards including points of operation, in-running nip points, rotating parts, and flying chips or sparks. The guarding has to be effective for the machine as it is actually used, not merely present.
The recurring failures are narrower than the standard is broad, and each leaves a documentary trail.
- A guard that was never fitted, or was fitted to a different configuration of the machine.
- An interlock that can be defeated without tools — a magnet, a zip tie, a spare key left in the panel.
- Guarding that makes a routine task impossible, so it is removed as a matter of course to keep production moving.
- A guard removed during maintenance and never refitted.
- Point-of-operation devices for presses and brakes that are absent, wrongly adjusted, or bypassed.
- Access panels and gates without interlocks at all.
Lockout-tagout, and the injuries it exists to prevent
Most maintenance-phase machinery injuries trace back to an isolation that was incomplete rather than absent. 29 CFR 1910.147 requires that all energy sources be isolated and any stored energy released or restrained before work begins.
The word "all" is doing the work there. Electrical supply is the obvious one. Stored hydraulic and pneumatic pressure, gravity acting on a raised platen or bed, springs under tension, rotational momentum in a flywheel and residual thermal energy are each capable of injuring someone after the power is off.
The characteristic failure patterns are equally consistent: a lock applied by one crew and removed by another at shift change, a machine isolated at the panel but not at the point of stored pressure, and jam clearance treated as a quick task not worth a full isolation.
Why the manufacturer is usually in the frame too
This is the part most injured workers are never told. Workers' compensation bars a claim against the employer and nobody else — and machinery injuries very often involve a design that made the injury possible.
The question is not only whether a guard was present on the day, but whether the machine was capable of being operated without it. A guard that can be defeated in seconds, on a machine that has to be unjammed several times a shift, is a design choice as much as an operator choice. Manufacturers are expected to anticipate foreseeable misuse.
Where the failed item is a component rather than the machine, the component maker may be liable directly. See defective equipment claims and third-party work injury claims.
What these machines do to people
The injuries follow the mechanism. Rotating and in-running parts produce crush injuries and amputations; presses and shears produce clean severance; augers and conveyors produce entrapment and degloving; and hand and arm injuries dominate the overall picture because hands are what enter the hazard. Where a limb is lost the claim becomes a lifetime one — see catastrophic injury claims.
The machine will not wait
A machine that has injured someone is usually back in production within days, repaired and re-guarded. Once that happens its condition at the moment of injury is a matter of recollection rather than physical fact. A written preservation request naming the specific machine, the specific parts and the maintenance and modification records should go out in the first week — see evidence for your claim and OSHA violations as evidence.
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