Wheel hardness selection principle for the following information:

. a soft material stainless steel cutting wheels hard to choose, they have to choose soft grinding wheel when grinding hard materials;
. b grinding soft and non-ferrous metal toughness, hardness should be chosen to be softer;
. c grinding poor thermal conductivity of the material should be selected soft wheel;
. d end mill than the circumference of the grinding, the grinding wheel hardness should choose softer;
. e under the same grinding conditions, compared with a resin bonded grinding wheel vitrified grindstone higher hardness level 1 to 2 hours;
. f wheel rotation speed is high, the tile cutting wheels hardness optional software 1-2 small stage;
g. high hardness dry grinding wheel coolant used during grinding than 1 to 2 hours class.