law: Factories Act, 1948 
  30. Revolving machinery 
  (1) 51[In every factory] in which the process of
  
  grinding is carried on there shall be permanently affixed to or placed near
  
  each machine in use a notice indicating the maximum safe working peripheral
  
  speed of every grindstone or abrasive wheel, the speed of the shaft or spindle
  
  upon which the wheel is mounted, and the diameter of the pulley upon such shaft
  
  or spindle necessary to secure such safe working peripheral speed.
  (2) The speeds indicated in notices under sub-section (1) shall
  
  not be exceeded.
  (3) Effective measures shall be taken in every factory to ensure
  
  that the safe working peripheral speed of every revolving vessel, cage, basket,
  
  fly-wheel, pulley, disc or similar appliance driven by power is not exceeded.