Grit, Grade And Structure Of A Grinding Wheel
Grit number indicate the size of the abrasive grains used making a grinding wheel. The grain sizes ranging fro coarse to very fine which are used in the manufacturing grinding wheels. The coarse wheels are used for f removal of material and fine grained wheel are us where finish is an important.
Coarse wheels are used for soft, ductile material, but fine grain wheel used to grind hard and brittle material
|Турe of grit||Grain size of grit No.|
|Coarse||8 10 14 16 20 24|
|Medium||30 36 46 54 60|
|Fine||80 100 120 150 180|
|Very fine||220 240 320 400 500 600|
The grade indicates the strength and hardness of the bond in the wheel. The grade divided into three category.
|Soft||A B C D E F G H|
|Medium||I J K L M N O P|
|Hard||Q R S T U V W X Y Z|
The structure denotes the spacing between the abrasive grains. The structure of grinding wheel depends on the hardness of the material being cut. Soft, ductile material and heavy cuts require an open structure whereas brittle material and finishing cut require a dense structure.