Ordinary grinding wheel material, granularity, hardness - How to read a grinding wheel's specification - Forture Tools
…GRINDING WHEEL GRADE. The grade of a grinding wheel refers to its hardness000 fpm (about 15 to 20 m/sec) are needed for the surface grinding of various types of high alloy and high strength work materials among which five with different contents of abrasive grains and four with different hardness levels.32A46-H8VG — Norton general purpose tool room grinding wheel. 32A is Norton's proprietary type of aluminum oxide,
