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 3580 - Mounting

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) Inspection.
						Immediately before mounting, all wheels shall be closely inspected and sounded
						by the user (ring test) to make sure they have not been damaged in transit,
						storage, or otherwise. The spindle speed of the machine shall be checked before
						mounting of the wheel to be certain that it does not exceed the maximum
						operating speed marked on the wheel. Wheels should be tapped gently with a
						light nonmetallic implement, such as the handle of a screwdriver for light
						wheels, or a wooden mallet for heavier wheels. If they sound cracked (dead),
						they shall not be used.
NOTE: This is known as the "Ring Test." Wheels must be
						  dry and free from sawdust when applying the ring test, otherwise the sound will
						  be deadened. It should also be noted that organic bonded wheels do not emit the
						  same clear metallic ring as do vitrified and silicate wheels. "Tap" wheels
						  about 45 degrees each side of the vertical centerline and about 1 or 2 inches
						  from the periphery as indicated by the spots in Figure A-20 and Figure A-21 of
						  Appendix E. Then rotate the wheel 45 degrees and repeat the test. A sound and
						  undamaged wheel will give a clear metallic tone. If cracked, there will be a
						  dead sound and not a clear "ring."
(b) Arbor size. Grinding wheels shall fit
						freely on the spindle and remain free under all grinding conditions. A
						controlled clearance between the wheel hole and the machine spindle (or wheel
						sleeves or adaptors) is essential to avoid excessive pressure from mounting and
						spindle expansion. To accomplish this, the machine spindle shall be made to
						nominal (standard) size plus zero minus .002 inch, and the wheel hole shall be
						made suitably oversize to assure safety clearance under the conditions of
						operating heat and pressure.
(c)
						Surface condition. All contact surfaces of wheels, blotters and flanges shall
						be flat and free of foreign matter.
(d) Bushing. When a bushing is used in the
						wheel hole it shall not exceed the width of the wheel and shall not contact the
						flanges.
(e) Blotters. When
						blotters or flange facings of compressible material are required, they shall
						cover entire contact area of wheel flanges. Highly compressible material such
						as blotting paper as normally used should not exceed.025 inch in thickness. If
						material of lower compressibility is used, greater thickness may be necessary.
						Blotters need not be used with the following types of wheels:
(1) Mounted wheels.
(2) Abrasive discs (inserted nut, inserted
						washer, and projecting-stud type).
(3) Plate mounted wheels.
(4) Cylinders, cups, or segmental wheels that
						are mounted in chucks.
(5) Types 27
						and 28 wheels.
(6) Certain Type 1
						and Type 27A cutting-off wheels.
(7) Certain internal wheels.
(8) Type 4 tapered wheels.
(9) Diamond wheels, except certain vitrified
						diamond wheels.