... automatic cooling water supply system. Yandiao 4040 CNC Engraving Machine,for Stone and Jade engravingTechnical parameters: Mold number4040 CNC ... features:1, Strong integral industrial cast-iron frame,make whole machine more rigidity. 2, High power water-cooling spindle ensure ... High-precision ball screw,smooth movement,to ensure that the machine tools high accuracy.6, With movement rotary fot both ...