How Machine Operator Injuries Happen — and Why the Machine's Design Often Matters
These cases usually begin at the part of the machine that does the work. Federal regulations define the point of operation as "the area on a machine where work is actually performed upon the material being processed." Under 29 C.F.R. § 1910.212, the point of operation of a machine whose operation exposes an employee to injury must be guarded, and where no specific standard applies, the guard must be designed and constructed "to prevent the operator from having any part of his body in the danger zone during the operating cycle," as 29 C.F.R. § 1910.212(a)(3)(ii) states.
In plain words, the rule's aim is a machine that keeps the operator's body out of harm's way by its design, not by the operator's care alone. That is why the design and guarding of a machine often matter as much as how it was run.
The same section addresses hand tools. Under 29 C.F.R. § 1910.212(a)(3)(iii), special hand tools for placing and removing material must allow easy handling "without the operator placing a hand in the danger zone," and those tools "shall not be in lieu of other guarding required by this section, but can only be used to supplement protection provided." A push stick or tong, in other words, is meant to add to a guard, not stand in for one.
The regulation also lists hazards that guarding is meant to address, including the point of operation, ingoing nip points, rotating parts, and flying chips and sparks. Injuries of this kind can come from contact at the point of operation, from clothing or a hand drawn into rotating parts, from ejected parts or material, from a machine that starts or restarts unexpectedly (a subject covered on the page on lockout/tagout failures), and from guards that were inadequate, removed or never installed, covered on the page about missing machine guards.
For someone looking back on an accident, the useful questions are what condition the machine was in, whether its guards were present and working, and whether it had recently been serviced.