I will post some pictures with additional details later today of the various modifications I made. ![]() I met that goal however, the actual cutting area of the new bed is 12.2" (335mm) wide, but only 9.85" (250mm) tall. My primary goal for the enlarged bed was to be able to use 12"x12" (305mmx305mm) materials for cutting. Here is a diagram showing the pins used on the LaserBoard: Laserboard pinout or simplified schematic Hardware Installation We have not yet released a pinout diagram as we prefer to walk people through whatever they want to do and are happy to answer those questions. I will note that your speed of 500mm/min ≅ 8mm/sec so my speed ranges of 5 and 10 mm/sec should bracket yours.īy “extensions” I assume you mean the enlarged bed? If not, maybe you can clarify? In either case, I wasn’t very accurate in my original description. ![]() I will re-run that test with just 1 pass to see what happens. As you can see in the second test, almost all the circles were cut out. I, then, re-focused the beam and increased the number of passes to 3, forgetting that the poorly focused lens was the probable reason for the reduced efficiency of the beam in the first test. After the first run, none of the circles were cut out with 2 passes. I realize now, based on your input, that I made a logical error in running the test speed/power grids. I thought it would be a good test because of all the small holes. The higher speeds looked OK, so I ran this image as a test: I ran a test speed/power grid and here are the results: After getting the new gantry to move properly and accurately and aligning the laser beam, I decided to cut something out of 3mm birch plywood. ![]() In other words, about the only parts of the original K40 I kept were the case and the CO2 tube. I’ve replaced the original firmware board with Cohesion3D LaserBoard (now running with Lightburn), increased the bed size to 12x20 inches with a new gantry, added a scissors lift with stepper motor to adjust Z height (mostly untested at this point), replaced original laser head with one from LightObject and lens from Cloudray, added an air-assist pump, replaced digital control panel with analog ammeter and 10-turn potentiometer and pushbutton switches for laser test and control of smoke/fumes exhaust system. I’ve had my K40 for about 6 months and have spent most of that time upgrading it.
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