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30 Jul 2022 23:59

Suddenly spindle servo stopped and now only turns in one direction

Category: Basic Configuration

OK so that's a complex spindle configuration with position mode for spindle orientation

So if this did work and nothing has changed settings wise, it might
be a good ides to verify the step/dir signals. SInce you say the spindle
will not run in reverse, I would verify that the DIR signal from the 7I76E
is valid at the drive connector.
30 Jul 2022 16:23

Basic configuration of LinuxCNC 2.8.2 + MESA 7i76e + iHSV57 servo

Category: Basic Configuration

Ah-ha! After also changing STEP_SCALE to 320, it is working great! :-) Amazing!

Thanks for the help!
30 Jul 2022 15:59

Basic configuration of LinuxCNC 2.8.2 + MESA 7i76e + iHSV57 servo

Category: Basic Configuration

I was using the .ini file that was included in the linked .zip from Talla, without any changes.

I now changed SERVO_PERIOD under [EMCMOT] in iHSV57.ini to 2000000, and the error message no longer appears.

I also tried to change STEPLEN and STEPSPACE under [JOINT_0] to 5000, but then the following error appears: "hm2/hm2_7i76e.0: stepgen.00.maxvel is too big for current step timings & position-scale, clipping to max possible"
30 Jul 2022 15:36

Basic configuration of LinuxCNC 2.8.2 + MESA 7i76e + iHSV57 servo

Category: Basic Configuration

How did you create you hal.ini files?

On a RPI, you may have to raise the servo thread period to 2000000 ns

If you cannot get step/dir drives to move (and the wiring is correct)
the most common issue is too short step pulses (start with 5000 ns)
30 Jul 2022 15:26 - 30 Jul 2022 15:27
Replied by PCW on topic 0-10v Servo Control with 7i76E

0-10v Servo Control with 7i76E

Category: HAL

Yes, that will certainly fit

The outputs on the last connector are handled by GPIO (no special function needed)
That is, they will look like this in the pinout file:

IOPortTag & x"00" & NullTag & NullPin,

There is no option for PWM combined with Stepgen on a pin. Any pin can be a
Stepgen of PWM pin, but not both.

All pins revert to GPIO (so have input and output capability) if they have no
special function or if the special function is disabled in the hal file
(with a "num_pwmgens = N" or "num_stepgens=M" etc statement in the
driver configuration line)
30 Jul 2022 15:22 - 30 Jul 2022 15:23

Basic configuration of LinuxCNC 2.8.2 + MESA 7i76e + iHSV57 servo

Category: Basic Configuration


I am trying to set up a Raspberry Pi 4 + LinuxCNC 2.8.2 + MESA 7i76E + 4 iHSV57 servos.

What works: I got LinuxCNC installed (though only using the inofficial image linked here:, and can ping the MESA card. After starting LinuxCNC, I select the configuration (I used the basic configuration from Talla: and it starts fine.

However, there are two problems:
- After a few seconds I get the error message "Unexpected realtime delay n task 0 with period 1000000"
- When trying to jog any axis, the servo doesn't move.

I tried to resolve the error message first. The latency-test reports a maximum latency of ~253000ns. I tried to put this into the stepconf tool, but the maximum allowed value there is 50000, so I am not sure how to proceed. I also found this page: but am not sure where to get the required attributes from, also for the .ods document that is linked in there. I am also unsure if that document is even relevant for me, as it refers to "software stepping" - is this what is done when using a MESA card? Or would the MESA firmware generate the pulses?

Any hints on how to proceed?
30 Jul 2022 06:58

0-10v Servo Control with 7i76E

Category: HAL

Hello, does this configuration fit in the mesa 7i98 
28 Jul 2022 22:21
Replied by PCW on topic 7i76E Stock ?

7i76E Stock ?

Category: Driver Boards

7I77s are available

We do have a couple 7I92s left

We have done a re-spin of the 7I92 but its still in the proto stage
A (overkill) option is a 7I96S+7I77 (this requires LinuxCNC 2.9)
28 Jul 2022 21:55
Replied by danilom on topic 7i76E Stock ?

7i76E Stock ?

Category: Driver Boards

Will there be some 7i92 and 7i77 ?
28 Jul 2022 21:12 - 28 Jul 2022 21:15

Migration from Mach3 for plasma

Category: General LinuxCNC Questions

The QTPlasmac config is the way forward for you.  It will be a bit foreign to you but its supported by sheetcam
It needs to run V 2.9 master branch of linuxcnc
It will support your Proma THC
But it will probably do better if you use a Mesa THCAD-10 to read the torch voltage so Linuxcnc can do the THC function internally
And you will get even better results if you ditch your breakoutboard with a Mesa 7i96 or 7i76e (if you can find one due to global chip shortages)

Linuxcnc requires a real time operating system eithe PREEMPT_RT or RTAI (which is close to obsolete now)

Also for where you want to go, read the building Linuxcnc chapter in the 2.9 docs. Its pretty straight forward to do. I did a video on a chromebook you might like to watch
28 Jul 2022 15:34 - 28 Jul 2022 15:35

Results of latency test, list of computers tested for use with LinuxCNC

Category: Computers and OS's

Here are my results on Lenovo M710q in pair with MESA 7i76E

LinuxCNC pc tests, version 20200930, started 28.07.2022 16:17:44
General info:
LENOVO,  10MQS36600
Bios version M1AKT52A, dated 12/24/2021
Chipset: Intel Corporation 200 Series/Z370 
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
CPU related data:
model name  : Intel(R) Core(TM) i5-6400T CPU @ 2.20GHz
cpu cores : 4
stepping  : 3
cache size  : 6144 KB
RAM related data:
Maximum Capacity: 32 GB
Maximum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Size: 4 GB
Size: 4 GB
GPU related data:
product: HD Graphics 530
configuration: driver=i915 latency=0
Parallel port related data:
number of parallel ports is 0
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"

Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia

Desktop environment : gnome
Windowmanager       : Mutter (Muffin)
Displaymanager      : lightdm
Kernel related data:
Kernel 5.10.0-16-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 noirqbalance mitigations=off nohlt idle=pool splash resume=UUID=73f68a61-1146-4abd-a9f9-d0f93ea00eb9"
Cpu idle driver: intel_idle
Kernel modules data:
Check if pcspkr is loaded: [0;32mNo, which is good![0m
Check if snd modules are loaded: [0;32mNo, which is good![0m
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : ELAN Touchscreen
Mouse 1 : Logitech K400 Plus
Mice  attached to USB:
Keyboards attached to USB:
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
Started firefox with '', WID 
Command for latency test is:
su dale -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a &"

Latency testing loop started Thu 28 Jul 13:21:42 BST 2022, 
should end after Thu 28 Jul 15:21:42 BST 2022

Swap useage: prerun: 0, running: 0

CPU core temperatures:
Core 0: Tmin: 28.0°C, Tmax: 59.0°C, (high = +84.0°C, crit = +100.0°C)
Core 1: Tmin: 29.0°C, Tmax: 60.0°C, (high = +84.0°C, crit = +100.0°C)
Core 2: Tmin: 30.0°C, Tmax: 59.0°C, (high = +84.0°C, crit = +100.0°C)
Core 3: Tmin: 29.0°C, Tmax: 58.0°C, (high = +84.0°C, crit = +100.0°C)
last latency data is as follows:.
 7194 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7195 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7196 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7197 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7198 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7198 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7199 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
Core 0:        +57.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:        +59.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:        +58.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:        +57.0°C  (high = +84.0°C, crit = +100.0°C)

BIOS is mostly setup as recommended-off (Virtualisation, Hyperthreading, Turbo, Speedstep)
I know this is OK but if I find ways to optimise will post results
28 Jul 2022 15:00 - 28 Jul 2022 15:02

LinuxCNC wieder retten

Category: Deutsch

Hallo zusammen,ich hatte meine Fräse mit LinuxCNC 2.8 und der MESA 7i76e inklusive Spindel über RS485 laufen gehabt und war alles klasse. Bis der Rechner ein Festplattenschaden hatte und mein Backup USB Stick nicht mehr lesbar war. Doppel Pech gehabt,Also alles neu gemacht inklusive Rechner Debian 10 und LinuxCNC.Ich habe auch eine Grundeinstellung mit dem pnccong Wizzard gemacht und noch eine gefunden .hal bei mir eingefügt.LinuxCNC startet, lässt sicher aber Maschine lässt sich nicht einschalten. Wie kann ich herausfinden woran es liegt? 
Ich hatte die gefundene .hal in die entstandene Maschinen hal eingefügt und diverse Fehler auskommentiert
28 Jul 2022 04:15

lost with encoder setup.

Category: HAL

Hello,  This is my first time coming to a forum for help, Usually able to figure things out for myself/ with reading others posts.  
Im having trouble getting my Cnc lathe to work with an encoder. I am using a mesa 7i76e and linux to control a 2 axis lathe, I recently was able to set up a new spindle encoder on the machine and was able to get a bit of help from the mesa team to get the encoder working.  It seems to be working properly according to the hal show where I have rotation and rpm listed and seems to be correct.  When I load a program from fusion 360, such as a threaded part the cnc lathe will stop at the line of code with the k command for the advancement of the z axis.  Im not sure if my problem is coming from the lathe and linux setup or if it is a post processor setup issue.  note: this machine was and is working with code from fusion 360 just have not been able to get spindle synchronization to work.   Thanks for any and all help in advance
27 Jul 2022 03:57 - 27 Jul 2022 04:14

Need some assistance understanding my Latency Test result

Category: General LinuxCNC Questions

I just purchased a renewed HP ProDesk 600 G1 SFF for my wife to work remotely and I wanted to see if it will work for LinuxCNC since it was stupid cheap. Here are the basic specs:
  • Processor: Intel Core i5-4570 3.2 GHz Turbo 3.6 GHz
  • Memory: 16GB DDR3
  • Storage: 500GB HDD
  • Optical driver: DVD
  • Port: USB 3.0, DisplayPort, VGA, RJ-45.

    I purchased the Mesa 7I76E Motion Control Board so I will not be using Parallel Port. 
    When I ran the test I was surprised at how high the Max Jitter number are. The Base Thread looks good from what I have read but not sure what to do about the Jitter numbers. 

                                       Max Jitter (ns)
    Servo thread (1ms):     3,284,972
    Base thread (25µs):    10,108,437

    If these numbers are a problem what can I do to get them in line? 

26 Jul 2022 16:39 - 27 Jul 2022 21:44

Stability issues with qtdragon_hd on Debian 11 Kernel 5.10.016rt

Category: Qtvcp

Reposting this report here hoping for a permanent solution.

I'm running on a quad core Celeron j4125, linuxcnc 2.9 complied from source and installed as package, XFCE desktop, Kernel 5.10 rt I get "error finishing read" randomly with my mesa cards(tested with a 7i96s and a 7i76e) only when running qtdragon/qtdragon_hd. I tried probe_basic and gmoccapy on the same machine and they both work perfectly fine for the same servo thread period on the same system. For reference, isolcpus makes no difference, so something strange is going on. When I try to session startup launch qtdragon upon login it, always throws the errorbefore the UI is even done loading, the only way I could get it to launch on startup is to create a small script that delays the start of linuxcnc by 10-15 seconds. It's almost as if  qtdragon is too processor intensive for my system that I have to finish loading the desktop before I can launch linuxcnc...again all other UIs perform fine even when started upon login.

The other thing is I always get segmentation fault upon exist but I can live with that if I can get it to run without crashing the hm2_eth component
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