Monday, June 14, 2010

Grit,grade and structure of grinding wheels

  1. Grit or grain: it indicates the size of the abrasive grains used in making a wheel
  • coarse wheels are used for fast removal of materials and for soft and ductile materials
  • fine grain wheels are used to grind hard and materials.
2. Grade: it refers to the tenacity or hardness with which the bind held the cutting points.

denoted y the 'A' -softest and 'Z'-the hardest .hard wheels are recommended for soft materials and soft wheels are recommended for the hard materials.

3. Structure or grain spacing: the structure refers to the number of cutting edges per unit area of wheel face as well as to the number and size of void spaces between grains.
denoted by numbers.
soft,tough and ductile materials and heavy cuts require an open structure where as hard and brittle materialsand finishing cuts require a dense structure

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