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  • Marcos DC
  • Marcos DC's Avatar
21 Feb 2026 06:54
Replied by Marcos DC on topic How good is Ethercat motion control?

How good is Ethercat motion control?

Category: EtherCAT

This is just an interpretation from reading similar issues here(forum), not empirical experience.

But the pattern you describe (random errors on startup, weird state after homing, reboot fixing it, and then everything staying stable) really looks like something in the startup / state synchronization / handshake is sometimes not lining up cleanly.

It doesn’t sound like a continuous motion control problem, more like: sometimes the system and the drives don’t start in exactly the same state (mode, position reference, command bits, etc.), and once that initial state is “clean”, everything behaves fine.

Things like edge-triggered vs level-triggered command bits, timing of enable/mode changes, or initial position/mode sync could easily lead to this kind of “works most of the time, but not always at startup” behavior.

So my guess would be to look closely at the startup sequence and state/mode/position synchronization, rather than at EtherCAT performance or servo tuning itself.
  • Lcvette
  • Lcvette's Avatar
21 Feb 2026 04:40
Replied by Lcvette on topic Add Buttons in Probe Basic

Add Buttons in Probe Basic

Category: QtPyVCP

On the probe page in qt designer, there is a button where the probe to is and the output from linuxcnc goes to the led on the probe graphic, use that as a template
  • tommylight
  • tommylight's Avatar
20 Feb 2026 23:41
Replied by tommylight on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions

First i hear about btop ... strange as i used htop a lot a while back!
htop should be in the repos, old and new.
  • Hakan
  • Hakan
20 Feb 2026 22:41
Replied by Hakan on topic QTPLASMAC integrated cad/cam

QTPLASMAC integrated cad/cam

Category: Plasmac

@tcbmetalworks, focus on the features you like to have.
I'm sure it will spark some interest when you show us.
  • NWE
  • NWE's Avatar
20 Feb 2026 22:10 - 20 Feb 2026 22:26
Replied by NWE on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions 

The OS is Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 5.4.0-216-generic x86_64)

JT

surprise
Let me check... I see. Quoting
www.thomas-krenn.com/en/wiki/BTOP_-_Moni...nux_system_resources

"btop is the successor to bashtop and bpytop and provides a modern, resource-efficient interface for monitoring system resources such as CPU, memory, network, and processes."

and

"On Debian 12 and Ubuntu 22.04 or newer, btop is already included in the standard repository."

So I guess that explains why you don't have btop available.
  • JT
  • JT's Avatar
20 Feb 2026 22:01
Replied by JT on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions

Maybe install btop, then you can watch a lot more stuff, including network and disk usage. When I learned of btop, I pretty much dropped using top because btop is sorta nice. sudo apt install btop

hope that helps
 

root@forum:~# man btop
No manual entry for btop
root@forum:~# apt install btop
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package btop

The OS is Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 5.4.0-216-generic x86_64)

JT
  • JT
  • JT's Avatar
20 Feb 2026 21:59
Replied by JT on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions

Log in to SSH, start "top" and monitor CPU usage and see if "log" appears often near the top of the screen.
If high CPU usage and no logs = DDOS
If both = brute force = someone trying to find user passwords using automated software
-
We had no brute force for quite a while as the result of that was the influx of existing member accounts being hijacked and used to post spam.
Or also possible, users using stronger passwords so much harder to crack. This is highly likely as nowadays wherever you register there are several warnings to use stronger mixed passwords.
 

The CPU usage is back to normal right now.

JT
  • NWE
  • NWE's Avatar
20 Feb 2026 21:47
Replied by NWE on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions

Maybe install btop, then you can watch a lot more stuff, including network and disk usage. When I learned of btop, I pretty much dropped using top because btop is sorta nice. sudo apt install btop

hope that helps
  • tommylight
  • tommylight's Avatar
20 Feb 2026 20:36
Replied by tommylight on topic Proposal to improve forum stability and structure

Proposal to improve forum stability and structure

Category: Forum Questions

Log in to SSH, start "top" and monitor CPU usage and see if "log" appears often near the top of the screen.
If high CPU usage and no logs = DDOS
If both = brute force = someone trying to find user passwords using automated software
-
We had no brute force for quite a while as the result of that was the influx of existing member accounts being hijacked and used to post spam.
Or also possible, users using stronger passwords so much harder to crack. This is highly likely as nowadays wherever you register there are several warnings to use stronger mixed passwords.
  • snowgoer540
  • snowgoer540's Avatar
20 Feb 2026 19:38
Replied by snowgoer540 on topic QTPLASMAC integrated cad/cam

QTPLASMAC integrated cad/cam

Category: Plasmac

It really seems to me like you are confusing what QtPlasmaC does and what the conversational inside of QtPlasmaC does.

QtPlasmaC does control the Z axis on its own, with exceptions being things like turning the THC on and off via g-code.

QtPlasmaC does not add lead-ins
QtPlasmaC does use the material feed rates


QtPlasmaC Conversational can add lead-ins if you so choose. It is also set up so that the material you have selected when creating the conversational file will be the material used for the generated g-code, thus using its feed rates.


QtPlasmaC is not a CAM package at all. Nor was its included conversational intended to be a replacement for a good plasma CAM package. It's there for convenience only.

This kindof makes a mess if you want to use sheet cam or something similar.

I suspect this view point to be a result of your inexperience with Plasma cutting. I create all of my cut jobs using g-code provided by SheetCAM. It's not a mess at all, and allows for great control of cutting.

aswell as theres not really a great way to run sheetcam via linux as far a i know.

Is the download link at the bottom of this link too convenient?
sheetcamshop.myshopify.com/pages/download-sheetcam

SheetCAM in Linux works fine.
  • RobC
  • RobC
20 Feb 2026 19:31
Replied by RobC on topic Poll to See Who Still Uses RTAI

Poll to See Who Still Uses RTAI

Category: General LinuxCNC Questions

I still use RTAI - not on cnc comp so I don't remember the version (likely one from 2023 or 2024)
  • 2tinker
  • 2tinker
20 Feb 2026 18:48
Replied by 2tinker on topic AMB FME-U 1400 DI

AMB FME-U 1400 DI

Category: Deutsch

Hmm... eine seltsame Antwort.
Erinnert mich an Äpfel und Birnen.
Aber erst einmal danke dafür.
Falls jemand noch etwas über den genannten AMB Motor zu berichten hat,
würde mich das helfen.
  • Avion
  • Avion
20 Feb 2026 18:21
Replied by Avion on topic retrofit of an existing CNC - tool sensor and 3d probe

retrofit of an existing CNC - tool sensor and 3d probe

Category: CNC Machines

oh yes, nice thank you. I did search for it but as usual, internal search did not like my keywords.

Thanks man, i will read through. My goal is to finish the primary portal CNC retrofit and to finally build my large custom 4 Axis wirecutter ;) But before I delve into that i want to have flushed out the processes and issues on the cnc and mesa and linuxcnc to fully understand everything.

BTW: What helps most if I basically have concrete issues. Shall i share configuration files or something? I don't want to dump blindly stuff ;D
  • snowgoer540
  • snowgoer540's Avatar
20 Feb 2026 17:47 - 20 Feb 2026 17:55
Replied by snowgoer540 on topic Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

Is this QTPlasmac Expected behaviour - Cycle Start and Jog disabled.

Category: Plasmac

-what should i monitor for the issue where the machine moves to a cut position and just stays there? This happens sometimes even when doing a manual cut where pressing F9 shows the machine running on screen but nothing moves. DRO does not change, machine state does. Again this happens a lot on QtPlasmaC, do not recall this happening on PlasmaC so might be a QT thing.

Again, I'd want to know if motion.eoffset-limited goes true when this occurs. I am also curious what state it's stuck in, so I would want you to turn on plasmac.debug-print before starting any cutting, etc. and copy and paste the terminal output from when it hung up.



The following commit will catch any commanded motion that would put the offending axis outside of the eoffset limits (soft limits) - this precludes you from having to monitor motion.eoffset-limited:
github.com/LinuxCNC/linuxcnc/commit/d179...e54c97ccc2bc0c58bf34

The following commit will catch any z-motion state transition issues (z-motion stalls in the same state for more than 3 seconds):
github.com/LinuxCNC/linuxcnc/commit/e2f0...30feba767f8588b2f28e

If you should encounter either of these error messages, please comment here with a recent backup of your QtPlasmaC config made from the SETTINGS tab, and the g-code file you were attempting to cut.
  • snowgoer540
  • snowgoer540's Avatar
20 Feb 2026 17:40
Replied by snowgoer540 on topic QtPlasmac Updates

QtPlasmac Updates

Category: Plasmac

QtPlasmaC updates - Master (v2.10):
  • update tooltips to included missing GUI elements and remove duplicate translations
  • fix RFL string comparisons
  • fix interlock for Material Parameters
  • add z-motion watchdog to GUI to catch any state-change hang ups not caught by monitoring motion.eoffset-limited
PlasmaC updates - Master (v2.10):
  • monitor motion.eoffset-limited to determine if the commanded motion is outside of the soft limits
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