... ballscrew Multifunction 4 -axis CNC Engraving Machine ZK-6060 ApplicationsWood ,Metal, Stone,acrylic ,organic glass, jade, emerald, jewelry engraving, ... , can show the processing path.3. Cooling system for the metal, hard materials, avoiding breaking the cutters and work ... 7. Good at small work piece precision processing, mainly used for metal, such as aluminium, copper, stainless steel, steel, alloy, ...