Flanges
(9) Flanges means collars, discs or plates between which wheels are mounted and are referred to as adaptor, sleeve, or back up type. See paragraph (c) of 1910.215 for full description. (10) Snagging means grinding which removes relatively large amounts of material without regard to close tolerances or surface finish requirements. (11) Off-hand grinding means the grinding of any material or part which is held in the operator's hand. (12) Safety guard means an enclosure designed to restrain the pieces of the grinding wheel and furnish all possible protection in the event that the wheel is broken in operation. See paragraph (b) of 1910.215. (13) Cutting off wheels means wheels having diameter thickness and hole size dimensions and are subject to all limitations of mounting and use listed for type 1 wheels, the definition in subparagraph (1) of this paragraph and paragraph (d) of 1910.215. They may be steel centered, diamond abrasive or organic bonded abrasive of the plain or reinforced type. (i) Limitation: Cutting off wheels are recommended only for use on specially designed and fully guarded machines and are subject to the following maximum thickness and hole size limitations. (ii) Maximum hole size for cutting-off wheels should not be larger than 1/4-wheel diameter. (14) Abrasive wheel means a cutting tool consisting of abrasive grains held together by organic or inorganic bonds. Diamond and reinforced wheels are included. (15) Organic wheels means wheels which are bonded by means of an organic material such as resin, rubber, shellac, or other similar bonding agent. (16) Inorganic wheels means wheels which are bonded by means of inorganic material such as clay, glass, porcelain, sodium silicate, magnesium oxychloride, or metal. Wheels bonded with clay, glass, porcelain or related ceramic materials are characterized as vitrified bonded wheels.