... 2.frequency spindle cooled by water 3.factory supplier 4 china mini artwork engraving machine Performance features: 1.This series adopts ... aixs adopt rolling ball screw, rational structure,stable performance 3.Large power frequency conversion water cooling motor, low noise ... good durability,4.Rotary parts is optional which is for engraving cylinder material.5.Available material6.Copper, aluminum, jade, ...