... 2.ball screw 3.stepper motor 4.high precision rotary device for advertising engraving machine ZK-1224Introduction: 1. ... duct collector, helping to suck the dust, milling dust, rotary axis for cylindrical materials, DSP offline control system, when ... stone processing, mold manufacturing, craft processing, light box cutting, building mold cutting, light equipment processing, sign, brand engraving and so ...