... for Jade Engraving , newest design , water cooling system,wholly iron cast ,moving working table squ High Precision Jade Engraving ... device ,servo system system are optionalApplication field:special for jade plaques engraving,also for Sign board process, mould, bronzing ,badge, pattern ... -codetransmission Two-nut rolling ball screws from Germany for x,y,z axis square linear guide wayResolution 0 ...