Laser lurches and then stops/hangs when Framing w/o moving first

[tbeaulieu (Todd)]

I have a strange issue with my Creality Falcon2 Pro when trying to frame.

If I move the laser just before using the frame function, where the fan is still running … the frame works fine.

If, however, the machine has been idling for a while, trying to frame causes the laser to lurch very fast and immediately - and violently - is stopped. Here it will be stuck. I have to tell LB to stop. Hit home and then can frame. Let it sit again, and the same behavior.

As expected, I got zero help on Creality’s forum.

10:50:04.082 D: Command sending with timeout
10:50:04.084 D: “Waiting for response…” busy: true state: 5
10:50:04.085 D: O: “?\n”
10:50:04.086 D: I: “<Idle|MPos:0.025,0.025,0.000|Bf:127,65535|FS:0,0|WCO:0.000,0.000,0.000>\r\r\nok\r\r\n”
10:50:04.183 D: Command sending with timeout
10:50:04.187 D: “Waiting for response…” busy: true state: 5
10:50:04.189 D: O: “?\n”
10:50:04.190 D: I: “<Idle|MPos:0.025,0.025,0.000|Bf:127,65535|FS:0,0|Ov:100,100,100|A:S>\r\r\nok\r\r\n”
10:50:04.285 D: Got stream - sending synchronous
10:50:04.287 D: O: “G00 G17 G40 G21 G54\n”
10:50:04.288 D: I: “ok\r\r\n”
10:50:04.288 D: O: “G91\n”
10:50:04.288 D: I: “ok\r\r\n”
10:50:04.288 D: O: “X91.975Y67.975\n”
10:50:04.289 D: I: “ok\r\r\n”
10:50:04.291 D: O: “M3\n”
10:50:09.039 D: Stop clicked

[MikeyH (Mike Hembrey)]

@tbeaulieu

has been idling for a while

Next time there is a delay, try entering a Move command in the Console window, like G1 X50 Y100 F1000 and see if it does the lurching.

[thelmuth (Tim Helmuth)]

Is it possible your USB Port went to sleep? I’ve heard others have this cause issues. I don’t know how to check if it does, but may be worth investigating.

[tbeaulieu (Todd)]

I need to take some time to try to understand that GCODE to see if there is a clue in it.

I can’t issue any commands when it’s stuck, because LB is hung, waiting for the machine to finish. I have to STOP it. Then it works.