Section R. 408.12643 - Tumbling mills, barrels and revolving cylindersRule 2643.
(1) A tumbling mill, barrel or revolving cylinder shall have an enclosure to a height of 42 inches to protect an employee if there are any moving projections.(2) The enclosure shall have an interlocked gate or barrier at the machine opening which shall cut the power off when the gate or barrier is removed. An inch control may be used for positioning or emptying when the gate or barrier is removed.Mich. Admin. Code R. 408.12643