California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 7 - General Industry Safety Orders › Group 3 - General Plant Equipment and Special Operations › Article 21 - Use, Care, and Protection of Abrasive Wheels › Section 3578 - Permissible Wheel Exposure for Periphery Grinding

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) Bench and Floor Stands. The angular
						exposure of the grinding wheel periphery and sides for safety guards used on
						machines known as bench and floor stands should not exceed 90 degrees or
						one-fourth of the periphery. This exposure shall begin at a point not more than
						65 degrees above the horizontal plane of the wheel spindle. (See Figure A-1 of
						Appendix A.)
Whenever the nature of the work requires contact with
						  the wheel below the horizontal plane of the spindle, the exposure shall not
						  exceed 125 degrees. (See Figure A-2 of Appendix A.)
(b) Cylindrical Grinders. The maximum angular
						exposure of the grinding wheel periphery and sides for safety guards used on
						cylindrical grinding machines shall not exceed 180 degrees. This exposure shall
						begin at a point not more than 65 degrees above the horizontal plane of the
						wheel spindle. (See Figure A-3 of Appendix A.)
(c) Surface Grinders and Cutting Machines.
						The maximum angular exposure of the grinding wheel periphery and sides for
						safety guards used on cutting machines and on surface grinding machines which
						employ the wheel periphery shall not exceed 150 degrees. This exposure shall
						begin at a point not less than 15 degrees below the horizontal plane of the
						wheel spindle. (See Figure A-4 of Appendix A.)
(d) Swing Frame and Automatic Snagging
						Machines. The maximum angular exposure of the grinding wheel periphery and
						sides for safety guards used on machines known as swing frame and automatic
						snagging machines shall not exceed 180 degrees, and the top half of the wheel
						shall be protected at all times. (See Figure A-5 of Appendix A.)
(e) Top Grinding. In operations where the
						work is ground on the top of the wheel, the exposure of the grinding wheel
						periphery shall be as small as practical, with a maximum exposure of 60
						degrees. (See Figure A-6 of Appendix A.)
(f) Guard Exposure Angles. The maximum
						exposure angles specified above shall not be exceeded. Visors or other
						accessory equipment shall not be included as a part of the guard when measuring
						the guard opening, unless such equipment has strength equal to that of the
						guard.
(g) Exposure Adjustment.
						Guards of the types described in subsections (a) and (b) of this section where
						the operator stands in front of the opening, shall be constructed so that the
						peripheral protecting member can be adjusted to the constantly decreasing
						diameter of the wheel. The maximum angular exposure above the horizontal plane
						of the wheel spindle as specified in subsections (a) and (b) of this section
						shall never be exceeded, and the distance between the wheel periphery and the
						adjustable tongue or the end of the peripheral member at the top shall never
						exceed one-fourth inch. (See Figures A-7, 8, 9, 10, 11, and 12 of Appendix
						B.)
1.
						  Amendment filed 11-22-85; effective thirtieth day thereafter (Register 85, No.
						  48).
Note: Authority cited: Section
							 142.3, Labor
							 Code. Reference: Section
							 142.3, Labor
							 Code.