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Grinding wheel Structure of grinding wheel Abrasive grain (artificial abrasice) Grain size Grade Structure Bond Bond subdivision symbols Grinding wheel specification and indication method Grinding wheel's shapes and size Process of grinding wheel Grinding operations and how to select grinding wheel Basic conditions for selection Prerequisite for selection standart by JIS. Standard selection of grinding wheel by JIS. Processing conditions Management of grinding operation problem Grinding wheel safety Treatment and storage Installation Points of caution when using Safety level Protective equipment CBN and Diamond wheels Bond characteristics Application examples by bond Concentration Indication Wheel shape symbols Truing and dressing Basic conditions on wheel selection

Bond subdivision symbols

The grinding wheel bond can not be adequately classified under the basic type-distinctions such as "V" or "B". The vitrified bond or resinoid bond, used for a wide variety of purposes, is subdivided according to each purpose, as indicated in the table below.

These "subdivision symbols" (or "supplementary symbols") are recorded in the grinding wheel specifications. As well, subdivision symbols are divided and given unique symbols according to grinding wheel manufacturer. The supplementary symbols in the table are the same as symbols used by Mitsui*.

Supplementary symbols of vitrified and resinoid bonds and their major applications.

Vitrified bonds Supp. Symbols Color Major application 1L Red Precision use 2Q Red WA mounted 4T Blue "A" type general use 4U White Fine grain 5L Yellow Precision use 5O White Precision C use 5S White Precision GC use 6V White Ring 8J White High precision use 8M Blue High precision use 9L Yellow High precision use 91L Red High precision use G75 White Precision GC use T04 Red High precision thin work T05 Red High precision thin work UH5 White Super soft HS3 White Super porous super soft

Resinoid bonds Supp. symbols Major application 47D Cylinder, Centerless, Disk 5AM Centerless 37A Roll 47R Disk 43B Free 97B Cylinder, Centerless 47A Disk 5AB Centerless 43G Free 97A Roll 47S Disk C7A Disk 47N Disk B7B Surface(powder) C2A Surface(ring) 5FA Surface(ring) 37D Disk UM Disk EL Disk UST Powder KM Regulating wheel MD Heavy grinding

Note : Mitsui* is Mitsui Grinding wheel co, ltd.