How to Make Signage LED Letter By Cnc Router. If you want to Cut Acrylic And Mark to Be LED Channel Letters! The First Thing you need to choose Special Acrylic Cutting Bits knife. Acrylic Cutting Bits knife can perform precision cutting on the surface to achieve a mirror effect, and the transmittance (such as plexiglass, acrylic, light guide plate, crystal block) can achieve the effect of surface polishing, eliminating the need for traditional polishing processes. Operate The Cnc Router To Cut the Letter as follows Steps. 1. Acrylic cutting processing, single-edged spiral milling cutter engraving knife is recommended. It is characterized by smokeless and odorless processing, fast speed, high efficiency, no chip sticking, and truly environmentally friendly. Its special manufacturing process ensures that acrylic is not processed. Burst, very fine knife lines, smooth and smooth surface. 2. For MDF cutting processing, it is recommended to use a double-edged large chip evacuation spiral mil