(ii ) (A) PSDI shall be implemented only by use of light curtain (photo-electric) presence sensing devices which meet the requirements of paragraph (c)(3)(iii)( c) of this section unless the requirements of the following paragraph have been met. tensile strength 20,000 p.s.i.) Class 20. Table O–9-Minimum Basic Thicknesses of Peripheral and Side Members for Safety GuardsĬast iron (min. Types 27 and 28 wheels, because of their shape, require specially designed adaptors. Type 27 and Type 28 wheels shall be used only with a safety guard located between wheel and operator during use. Mounts which are affixed to the wheel by the manufacturer shall not be reused. The variance in flange diameters, the adaptor nut being less than one-third wheel diameter, and the use of side pressure in wheel operation limits the use to reinforced organic bonded wheels. The adaptor nut which is less than the minimum one-third diameter of wheel fits in the depressed side of wheel to prevent interference in side grinding and serves to drive the wheel by its clamping force against the depressed portion of the back flange. The back flange shall extend beyond the central hub or raised portion and contact the wheel to counteract the side pressure on the wheel in use. (ii ) Type 27 and Type 28 wheels, because of their shape and usage, require specially designed adaptors. The hood shall be so mounted as to insure that its operation will be positive, reliable, and in true alignment with the saw and the mounting shall be adequate in strength to resist any reasonable side thrust or other force tending to throw it out of line. It shall be made of material that is soft enough so that it will be unlikely to cause tooth breakage. The hood shall be made of adequate strength to resist blows and strains incidental to reasonable operation, adjusting, and handling, and shall be so designed as to protect the operator from flying splinters and broken saw teeth. The hood and mounting shall be arranged so that the hood will automatically adjust itself to the thickness of and remain in contact with the material being cut but it shall not offer any considerable resistance to insertion of material to saw or to passage of the material being sawed. (1 ) Each circular hand-fed ripsaw shall be guarded by a hood which shall completely enclose that portion of the saw above the table and that portion of the saw above the material being cut.
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