Here are some initial results when using laser directly out-of-the-box without any modifications to the laser driver board or PWM logic. The main challenge is to find an optimum speed v laser intensity setting. When the laser is full on it burns the UV coatiing and when running at high speed the PWM pattern of the laser could be seen on the board. Test strips were created to see at which speed the PWM pattern was no longer visible but at the same time was 'exposing' the UV board; rather than burning the UV coating on the board.  F1000 F800 F700 F600 F500 F400 The PWM pulse pattern is clearly visible at F=1000mm/s F500 gave the cleanest line, however if looking closely at the lines t's also possilbe to see two parallel lines as though there are two parallel laser beams being projected. In the next image you can see that power above 89 just burn way the UV etch resist layer on top of the board.  |
Home > PCB Prototyping using a CNC UV Laser, LCD Mask and Isolation CNC Milling > Prototyping PCB using CNC Laser Engraver >