Motions
"Rotation" is circular motion around an axis or center such as rotating collars, couplings, cams, clutches, flywheels, shaft ends, and spindles that may grip clothing or otherwise force a body part into a dangerous location. Even smooth surfaced rotating machine parts can be hazardous. Projections such as screws or burrs on the rotating part increase the hazard potential.
Rotating Parts
The danger increases when projections such as set screws, bolts, nicks, abrasions, and projecting keys or set screws are exposed on rotating parts. You should consider exposure to rotating parts as an "imminent danger" situation that must be corrected immediately.
In-running Nip Points
In-running nip point hazards are caused by the rotating parts on machinery. There are three main types of in-running nips.
Rotating and Fixed Parts
1. Parallel rotating parts
Parts can rotate in opposite directions while their axes are parallel to each other. These parts may be in contact producing nip
point. Stock fed between the rolls may also produce nip points. This danger is common on machines with intermeshing gears, rolling mills, and calendars.
2. Tangentially moving parts
Tangentially moving nip points are also created between rotating and tangentially moving parts. Some examples would be: the point
of contact between a power transmission belt and its pulley, a chain and a sprocket, and a rack and pinion.
3. Rotating and fixed parts
Nip points can occur between rotating and fixed parts which create a shearing, crushing, or abrading action. Examples are: spoked
handwheels or flywheels, screw conveyors, or the periphery of an abrasive wheel and an incorrectly adjusted work rest.
Tangentially Moving Parts
Parallel Rotating Parts
Knowledge Check Choose the best answer for the question.
1-3. A flywheel would present which type of nip point hazard?
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