Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › INDOOR OPERATIONS › Part M - Guarding Tools and Equipment; Farm Shops; Materials Handling › Section 296-307-19006 - Guarding abrasive wheels

Current through Register Vol. 24-14, July 15, 2024
(1)
				  Abrasive wheels must be used only on machines provided with safety guards.
Exception:
This requirement does not apply to the
								following:
1. Wheels used for internal work while the wheel
								is within the work being ground.
2. Mounted wheels 2 inches and smaller in
								diameter, used in portable operations.
3. Types 16, 17, 18, 18R, and 19 cones, plugs, and
								threaded hole pot balls where the work offers protection.
4. Specially shaped "sickle grinding" wheels
								mounted in mandrel-type bench or floor stands.
(2) The safety guard must cover the spindle
				  end, nut, and flange projections.
Exceptions:
1. When the work provides protection to the
								operator, the spindle end, nut, and outer flange may be exposed. When the work
								entirely covers the side of the wheel, the side covers of the guard may be
								omitted.
2. The spindle end, nut, and outer flange may be
								exposed on portable machines designed for, and used with, type 6, 11, 27, and
								28 abrasive wheels, cutting off wheels, and tuck pointing wheels.
3. The spindle end, nut, and outer flange may be
								exposed on machines designed as portable saws.
(3) The guard must cover the sides and
				  periphery of the wheel.
Exceptions:
1. Bench and floor stands:
a. The maximum permissible angle of exposure is
								90°. This exposure must begin at a point not more than 65° above the
								horizontal plane of the wheel spindle.
b. Wherever the nature of the work requires
								contact with the wheel below the horizontal plane of the spindle, the exposure
								must not exceed 125°. This exposure must begin at a point not more than
								65° above the horizontal plane of the wheel spindle.
2. Swing-frame grinders may only be exposed on the
								bottom half; the top half of the wheel must be enclosed at all times.
3. Where the work is applied to the top of the
								wheel, the exposure of the grinding wheel periphery must not exceed
								60°.
4. When the work entirely covers the side of the
								wheel, the side covers of the guard may be omitted.
(4) The safety guard must be mounted to
				  maintain proper alignment with the wheel, and the strength of the fastenings
				  must exceed the strength of the guard.
(5) Take care to see that the safety guard is
				  properly positioned before starting the mounted wheel.
(6) Abrasive wheel machinery guards must meet
				  the design specifications of ANSI B7.1-1970.
(7) Exception: WAC 296-307-19006 does not
				  apply to natural sandstone wheels and metal, wooden, cloth, or paper discs,
				  with a layer of abrasive on the surface.
Statutory Authority:
						RCW
						 49.17.040. 98-24-096, § 296-307-19006,
						filed 12/1/98, effective 3/1/99. 97-09-013, recodified as § 296-307-19006,
						filed 4/7/97, effective 4/7/97. Statutory Authority:
						RCW
						 49.17.040, [49.17.]050 and [49.17.]060.
						96-22-048, § 296-306A-19006, filed 10/31/96, effective
						12/1/96.