Section R. 408.12622 - Electric magnets and vacuum chucksRule 2622.
(1) A grinding machine with a rotating table and equipped with a magnetic or vacuum chuck to hold the stock shall be interlocked to prevent contact between the stock and tool, unless the stock is secured to the table or chuck and the employee is protected by a guard capable of retaining flying stock within the machine.(2) A grinding machine with a reciprocating table and equipped with a magnetic or vacuum chuck to hold the stock shall have an end guard to protect an employee from flying stock or tools, or the machine shall meet the following conditions: (a) The machine shall be located so that, in case of chuck or magnet failure, any flying material or object will carry into a solid wall.(b) The wall shall be covered with an energy absorptive material capable of absorbing the shock and preventing the ricocheting of flying materials. Plasterboard shall not be used where coolant is used in the operation.
(c) The machine shall be positioned so as not to allow room for an employee to pass between the machine and the wall.Mich. Admin. Code R. 408.12622