... 3.DSP controlling DM-1121L marble Laser engraverMarble Laser engraving machineDM-1121L marble laser engraving parameter,1. Laser tube, 60w2. Working area, ... -phrase stepper 11. Auxiliary equipments: Exhaust-fans, air-exhaust pipe, water chiller, air pump12. Controlling software: DSP control system ... worktable,3).Red light pointer, the unit makes the laser path visible4).USB port, the unit that makes ...