... 4.stepper motor 3d stone cnc router/marble carving machine QD-1318:Machine Configuration:1. Steel ... .Optional Parts:1. DSP Controller (Allow machine work without connecting computer)2. 4.5KW ... 2200mm*1800 mmApplicable Materials:Natural marble, granite, artificial stone, tombstones, milestones, ceramic tiles, glasses, and ... board, etc.Working example: 3d stone cnc router/marble carving machine QD-1318