... stone engrving machine best price with mutifunction engraving function for advertisent ,brand logo ,and wooding Specification OF CNC STONE ENGRAVING MACHINE ... Square line guide railDrive motorstepper motorSpindle3000W liquid-cooled with 24,000rpm,VFDMax. Working speed30,000mm/minCollets Type3. ... high speed.·Imported 2.5cm square guide rail with flange sliding block, rack and pinion, stability.· ...