Hong Kong Regulations

FACTORIES AND INDUSTRIAL UNDERTAKINGS (ABRASIVE WHEELS) REGULATIONS - REGULATION 10

Tapered wheels and protection flanges

(1) Where the work which is ordinarily done (or, in the case of a new
abrasive wheel, is intended ordinarily to be done) at any abrasive  wheel
requires that the exposed area of the wheel shall exceed 180 degrees measured
at the centre of the wheel then, where practicable, the wheel shall be tapered
from its centre towards its periphery by at least 6 per cent on each side and
shall be mounted between suitable protection flanges.

(2) Protection flanges between which any abrasive wheel is mounted in
accordance with paragraph (1) shall be of substantial construction and
properly maintained and shall have the same degree of taper as the wheel and
shall-

   (a)  in the case of a wheel of 300 millimetres or less in diameter, be of a
        diameter equal to at least half the diameter of the wheel;

   (b)  in the case of a wheel of more than 300 millimetres but not exceeding
        750 millimetres in diameter, be of a diameter equal to at least the
        diameter of the wheel less 150 millimetres; and

   (c)  in the case of a wheel of more than 750 millimetres in diameter, be of
        a diameter equal to at least the diameter of the wheel less 200
        millimetres.