30 CFR 57.14115 – Stationary grinding machines
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Stationary grinding machines, other than special bit grinders, shall be equipped with—
(a) Peripheral hoods capable of withstanding the force of a bursting wheel and enclosing not less than 270°—of the periphery of the wheel;
(b) Adjustable tool rests set so that the distance between the grinding surface of the wheel and the tool rest is not greater than
(c) A safety washer on each side of the wheel.