... axis double motors driving Rack gear transmission Imported square linear guide rail M Large power stone engraving machineFeatures:1, Profiled steel ... high accuracy, fast speed and strong power4, Imported square linear guide rail ensures high accuracy, maximum work load and long service ... Diameter3.175, 6, 12.7X,Y,Z guide rail Square Linear RailTransmission X Y Precise Rack Gear, Z Ball ScrewApplication ...