13.A.13 Clothing.
- PPE must be used as outlined in Section 5 of this manual.
- Loose and frayed clothing, loose long hair, dangling jewelry (including dangling earrings, chains, and wrist watches) must not be worn while working with any power tool.
13.A.14 For grounding requirements, see Section 11.
13.A.15 An electrical power control must be provided on each machine/power tool to make it possible for the operator to cut off the power for the machine/power tool without leaving the point of operation.
13.A.16 On applications where injury to the operator might result if motors were to restart after power failure, provisions must be made to prevent machines from automatically restarting upon restoration of power.
13.A.17 Floor- and bench-mounted power tools must be anchored or securely clamped to a firm foundation. Anchoring or securing must be sufficient to withstand lateral or vertical movement.
13.B Grinding and Abrasive Machinery.
13.B.01 With the exception of the following, abrasive wheels must be used only on machines provided with safety guards. > See ANSI B74.2 for descriptions of abrasive wheel types.
- Wheels used for internal work while within the work being ground;
- Mounted wheels, 2 in (5 cm) and smaller in diameter, used in portable operations;
- Types 16, 17, 18, 18R, and 19 cones and plugs and threaded hole pot balls where the work offers protection or where the size does not exceed 3 in (7.6 cm) in diameter by 5 in (12.7 cm) long;
- Type 1 wheels not larger than 2 in (5 cm) in diameter and not more than 1/2 in (1.2 cm) thick, operated at peripheral speeds less than 1800 surface-feet per minute (ft/min) (9.1 surface-m/s) when mounted in mandrels driven by portable drills;
- Type 1 reinforced wheels not more than 3 in (7.6 mm) in diameter and 1/4 in (6 mm) in thickness, operating at peripheral speeds not exceeding 9500 surface-ft/min (48.3 surface-m/s), if safety glasses and face shield protection are worn.
13.B.02 Tongue guards on bench/stand grinders must be adjustable to within 1/4 in (6 mm) of the constantly decreasing diameter of the wheel at the upper opening.
13.B.03 Grinders must be supplied with power sufficient to maintain the spindle speed at safe levels under all conditions of normal operation.
13.B.04 Work or tool rests must not be adjusted while the grinding wheel is in motion.
13.B.05 Work/tool rests on power grinders must not be more than 1/8 in (3 mm) distance from the wheel.
13.B.06 Abrasive wheels must be closely inspected and ring-tested before mounting. Cracked or damaged grinding wheels must be destroyed.
13.B.07 Grinding wheels must not be operated in excess of their rated safe speed.
13.B.08 Floor stand and bench-mounted abrasive wheels used for external grinding must be provided with safety guards (protective hoods).
- The maximum angular exposure of the grinding wheel periphery and sides must be not more than 90º, except that when work requires contact with the wheel below the horizontal plane of the spindle the angular exposure must not exceed 125º; in either case, the exposure must begin not more than 65º above the horizontal plane of the spindle.
- Safety guards must be strong enough to withstand the effect of a bursting wheel.
Knowledge Check Choose the best answer for the question.
13-2. Tongue guards on bench/stand grinders must be adjustable to within _____ of the constantly decreasing diameter of the wheel at the upper opening.
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