1. grinding of soft materials hard to choose resin grinding wheel, grinding hard materials to choose soft grinding wheel
2. when grinding of soft and tough non-ferrous metals, hardness should be selected to be soft;
3. grinding of low thermal conductivity of the material should be selected soft resin grinding wheel
4. end-face grinding circular grinding wheel hardness soft to be elected;
5. under the same conditions, with resin grinding wheel higher than the hardness of ceramic bonded grinding wheel 1~2 small level;
6. resin grinding wheel rotational speed high, optional soft 1~2 small wheel hardness levels;
7. than dry grinding coolant grinding wheel hardness 1~2 small level.