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The design model of CNC small engraving machine is composed of three parts: computer, engraving machine controller and engraving machine host. Working principle: It is designed and typeset through the special engraving software configured in the computer, and the information of design and typesetting is automatically transmitted to the engraving machine controller by the computer, and then the controller converts the information into a power signal (pulse train) that can drive the stepper motor or servo motor, and controls the engraving machine host to generate X, Y, Z three-axis engraving cutting roadbed diameter. At the same time, the high-speed rotating engraving head of the engraving machine, through the cutting tool configured according to the processing material, the processing material fixed on the host workbench is cut, you can carve out a variety of flat or three-dimensional relief graphics and text designed in the computer, to achieve automatic engraving operations.