... also for repairing, grinding, polishing, crystallizing millstones.diamond floor grinding machine HWG 70 has the quickest ... It is good for grinding and polishing in large area, and greatly consume time and labor ... motor, it is good for grinding the large area;2,All gear box and motor ... concrete, marble, granite, terrazzo with various grit of diamond metal, resinbond.3, Remove painting, coating, epoxy, ...