... iron frame -with stepping motor -High accuracy High quality cnc drilling machine for metal Product features: With 600mm* 600mm engraving range;With 3 ... the screw nut, and the balls rolling fast when the machine working. For the coefficient of rolling friction is smaller, the ... various of materials, such as: wood, stone, jade, acrylic, metal, ceramics, etc. Platform materialAnd we offer all kinds of CNC ...