Northern Industrial Tools 10000 BDG - Manual (Page 22)

Installation / Initial Set-Up
22
DANGER :
All parts of the power transmission assembly must be equipped with a guard
that prevents access to rotating parts. Clothing or hair can become rapidly
entangled in unguarded rotating parts, resulting in serious injury or death.
Guard requirements. The guard must:
1) Prevent contact with all rotating shafts, pulleys, belts, and couplings.
2) Allow for adequate cooling ventilation and hot exhaust clearance, as
described in the previous section “4. Select a Suitable Site”.
3) Be constructed of non-combustible, heat-resistant, durable and impact-
resistant material.
Expanded metal, perforated or solid sheet metal, wire mesh on a frame of angle
iron, or iron pipe securely fastened to the frame can be used.
Openings in, around, and between guards can allow fingers/hands to protrude
into dangerous areas where hazards exist. The allowable size of openings
depends on the distance of the opening from specific hazards. Follow the OSHA
guidelines below (extracted from 20 CFR 1910.217 Table O-10) for maximum
opening size:
Distance of Guard
Opening from Moving
Parts
Maximum Width of Guard
Opening
½” to 1½” 1/4”
1½” to 2½” 3/8”
2½” to 3½” 1/2”
3½” to 5½” 5/8”
5½” to 6½” 3/4”
6½” to 7½” 7/8”
Figure 7 below illustrates a properly guarded power transmission assembly.