Jerk

[CNCNerd (J)]

What’s your jerk set to? I was having an issue of rough stops and starts around curves. It was at 1 and I raised it to 10 which appeared to help.

[kvcummins (K Cummins)]

Somewhere between Dennis Leary and Andrew Dice Clay…

[robertbu (Robert Bunney)]

Not sure if this is your problem, but a bug in the firmware was identified that causes “jittering / shaking” during curves a few weeks ago. Less than a day ago, V1 dropped new firmware that contains the fix. I believe the fix was just a setting change, so if you are not running V1 firmware, you can do a diff on configuration.h to see the fix.

Mpcnc jittering / Shaking

Hello fellows, I am kind of frustrated with this issue, my Mpcnc is executing the Gcode with stoping in between coordinations for 10-30 milliseconds as you can see in the video. This is leading to jitter effects and unsmooth movement of the X and Y-Axis (Only with Curvy movements) Linear movement seems to work as usual. Important to know is : -The Mpcnc had a perfectly smooth movement just before I decided to change the setup to Dual end-stop and flashing the new firmware. Before it was wired …

Edit: I just took a look at the configuration.h file for the lastest V1 release and compared it to what I am running (which has the jittering behavior). CLASSIC_JERK is turned off in the latest release which I believe is directly related to this bug.

[CNCNerd (J)]

Thanks for the help, really appreciate the detailed response!! I think that’s the issue I’m currently having. I’ll upload the firmware and try it out.

[CNCNerd (J)]

Just ran the same program I was having issues with and it’s running great now. Thanks!