Yeah, this seems quite simple on the firmware side stuffing a new value into a timer register is pretty easy. The software developer of Remora says the change to the code to handle variable frequency PWM is very doable. Check out what Don posted about his research before you do any tests. I’d always wrote off Ruida controllers because of the proprietary software required to run it and damned if I don’t insist on choices more than anything. Smoothie and others require shutting down the controller, changing a config.txt file on the uSD and restarting or worst, changes to source code, recompile, upload.
While not as handy as being able to get this in GCode, still very handy. I will have to figure out how to use it.Ĭool, so at least Ruida users have a way to easily experiment and select optimal PWM frequency values for their machines. However I’ve found that when it’s available in LightBurn software, it’s operational. The documentation states that ‘if using an RF laser…,’ so I kind of blew it off, but it had occurred to me. I had wondered about that when I first saw that my Ruida controller supports a user changeable PWM frequency. This might explain what was going on when I was doing a test pattern of dithering and grayscale on white tiles and my grayscale patterns went from white right to black instead of the gray scale and I’ve been using dithering ever since.Īctually, check out this screen shot of LightBurn in the one of the line control tabs. LinuxCNC lets you do those types of things.ĭoes anyone know if this effect of PWM frequency changes Ben_Meyers and found and discussed are K40 LPS specific or generally useful to all laser cutters? LinuxCNC/Remora should be able to run on all LPS1768/1769 based boards like Smoothie, Cohesion, SKR, etc so maybe this is of interest to other K40 users. Either using a special M code injected into the GCode or dynamically by setting thresholds on the tool movement average velocity or maybe a threshold on laser power itself. So now I’m looking into ways to dynamically change the PWM frequency during a single job.
I’m testing LinuxCNC/Remora on my K40 and setting up the spindle control so getting deep into what type of PWM(PDM vs PWM) is needed and configuring the frequency of the PWM. If I change the laser_module_pwm_period from 400 to 20 the machine cuts perfect again… but pwm is no good UPDATE: PWM is working!! but cuts have been effected.
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