MSHA - Code of Federal Regulations - 30 CFR 77.401
30 CFR § 77.401
Stationary grinding machines; protective devices.
(a) Stationary grinding machines other than special bit grinders
shall be equipped with:
(1) Peripheral hoods (less than 90° throat openings)
capable of withstanding the force of a bursting wheel.
(2) Adjustable tool rests set as close as practical to the
(3) Safety washers.
(b) Grinding wheels shall be operated within the specifications of
the manufacturer of the wheel.
(c) Face shields or goggles, in good condition, shall be worn when
operating a grinding wheel.