ANSI B11.9-2010 pdf download Safety Requirements for Grinding Machines
3.2 coated abrasive product: A coated abrasive product consists of a layer of abrasive particles firmly attached to a paper, cloth, fiber backing，or other flexible bonding material by means of a bonding agent.
3.3 dressing: Dressing is the process by which the abrasive product’s shape and surface condition are altered by a dressing tool.
3.4 flanges: Devices used to attach the abrasive product to the spindle.
3.5 peripheral speed: The distance that any one abrasive grain on the peripheral surface of a grinding abrasive product travels per unit time.
3.6 reducing bushings: Reducing bushings are inserts or devices used to reduce the hole size in a grinding abrasive product so that it can be mounted on a smaller-diameter spindle correctly.
3.7 surface feet per minute (peripheral speed):’ The distance in feet that any one abrasive grain on the peripheral surface of a grinding abrasive product travels in 1 minute.
3.8 mounted abrasive products: Mounted abrasive products, usually ≤50 mm (2 in) in diameter and of various shapes, and may be either organic or inorganic bonded abrasive products, secured to plain or threaded steel mandrels.
3.9 abrasive product speed: Abrasive product speed shall be computed from the free running speed of the machine spindle.
3.10 offhand grinding: ， hand-held or manual grinding whereby the workpiece is placed in contact with the point of operation.
3.11 snagging: grinding which removes relatively large amounts of material without regard to close tolerances or surface finish requirements.
3.12 zone exhaust system: A zone or area exhaust system provides for exhausting the work area in which a machine (or machines) is located.