The hazard
A pinch point is any spot where part of your body can get caught between a moving part and something solid, or between two moving parts. They are everywhere on the job: gears, rollers, belts, doors, tailgates, chains, loads being set down and machines that swing. It happens in a split second, and a caught hand can be crushed before you can pull it back.
The action
Never reach into a machine to clear a jam or make an adjustment while it can still move. In general industry, the lockout rule covers servicing during normal production when you have to remove or bypass a guard, or put any part of your body where the machine does its work or into a danger zone during its operating cycle. Shut it down, lock it out and make sure it cannot start before your hands go in. (29 CFR 1910.147(a)(2)(ii))
ASK THE CREW
When do we lock out a machine before reaching in, and who is authorized to do it?
From the talk: Pinch points. Read it in full, free, with the questions and the sign-in sheet.