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Dressing And Trueing. When the sharpness of grinding wheel becomes dull because of glazing and loading, dulled grains and chips are removed (crushed or fallen) with a proper dressing tool to make sharp cutting edges and simultaneously, make recesses for chips by properly extruding to grain cutting edges. Thus, these operations are for the dressing.HST Cone Crusher Technical Advantage - GitHub Pages. 2015. 7. 14. HST cone crusher is suitable for crushing Platts hardness of f=5-16 such as iron ore, non-ferrous metal ore, granite, limestone, quartz rock, Sha Yan, pebbles and other kinds of ore and rock, widely used in metal mines, metallurgical industry, chemical industry, building industry, cement industry, sand industry etc.