Metallographic Sample Grinding and Polishing Machine 1.stepless speed 2.low noise 3.corrosion resistant ... use Model YMPZ-2 Automatic Metallographic Sample Grinding and Polishing Machine Main parameters:Grinding method: AutomaticGrinding disk diameter: 230 mmSpeed: ... MAXΦ45mm (Selectable,φ25,φ30,φ45 etc.)Interface: membrane switch, digital display, can set the grinding speed, timing, steering and tank ...