Hi all, I try to laser engrave text. The gcode is self-made. Everething looks fine in Luban and Elstam. I engrave from the controller to avoid wifi-problems. Still there are a few lines not printed. It looks they are done with 3%-5% power, like M3 starts too late or the laser is switched off to earl…

I just did a couple calibration patterns on a piece of paper that isn’t perfectly flat. The engraving starts at the bottom and travels up. less flat: [image] more flat: [image] It should be flat across the bottom, and it’s not. [image] But, even though the paper isn’t flat, the tops are strai…

How is the GCODE getting to the SM? Another user was using WiFi. I wondered if the issue is latency and wonder if you see a different result if you do this via USB cable or USB memory stick. I also wonder if the issue might be related to how the laser is switched on and off. I haven’t looked at an…

In my case, touchscreen built in calibration routine. You can see the laser turn on, but it doesn’t burn at the start of the line, and when it starts burning it visibly changes how it looks.

i believe @brent113 is correct, if i remember right from my physics classes there is a threshold for burning similar to friction. it takes more energy to start then to continue. think of trying to push a heavy cart, it takes more energy to start the cart rolling then it does to keep it rolling, and …

I made a test, not alternating between M3 and M5, I toggled between M3 P35 S89 and M3 P2 S5. It got worse. The PWM is not synchronized with the next G1 command. This should be a small mistake in the sources. When they get released? [LaserError2]

Here is the source: [image] FYI:Source code of Snapmaker Firmware Snapmaker 2.0 Here is the link for the download page of Snapmaker 2.0 firmware:

Thanks, is HAL_LaserPwm_STM32F1.cpp the file for setting the timer1 PWM up? In the documentation is written: As the preload registers are transferred to the shadow registers only when an update event occurs, before starting the counter, the user must initialize all the registers by setting the UG …

I’ve also been digging into the firmware, but I don’t have any previous experience with these gigadevice ST clones, or ST chips in general. Sounds like you might? Are you thinking the HAL_LaserPwm… call to TimSetPwm should contain a call to timer_generate_update(__) from HAL_timers… to set that UG …

Hello brent113, I used ATMEL and NXP chips. With ST I have to learn it like you.

I also come from an Atmel background. In another thread people were talking about the laser PWM frequency, and guessing it was around ~1kHz. If that is true then even a substantial preload register lag of 10cycles, even at a travel speed of 50mm/s, would manifest as a turn on delay of just 0.5mm. A…

Laser dropouts failure

Snapmaker 2.0 (3-in-1)

xchrisd October 26, 2020, 10:37am 11

Here is the source:

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Laser dropouts failure

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