... motor 4.HIWIN guide rail High quality mini cnc milling machine for metal(7STC-6060A) Product features: With 600mm* 600mm engraving range ... screw nut, and the balls rolling fast when the machine working. For the coefficient of rolling friction is smaller, the ... of CNC engraving machines, suitable for various of materials, such as: wood, stone, jade, acrylic, metal, ceramics, etc. Platform materialAnd ...