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  • ajar171
  • ajar171
16 Apr 2025 09:28 - 16 Apr 2025 09:35
Replied by ajar171 on topic Custom interface board questions

Custom interface board questions

Category: General LinuxCNC Questions

Thanks for the answers!

Why new? I use ethercat a lot at work, so I also wanted ethercat on my machines :)

Yes, a lot of hardware (stepper, servo drives, etc.) have ethercat and I also use them, but an encoder input from Beckhoff costs a fortune even on the second hand market. Also the ethercat driver in LinuxCNC works very nicely, and is in my opinion easier to configure than a Mesa card.

The I/O board is only a side project to be honest, my main goal is an open source ethercat MPG pendant with a display.
  • ShemJ
  • ShemJ's Avatar
16 Apr 2025 09:20
Replied by ShemJ on topic [ Vfdmod ] An easy VFD control over MODBUS RTU

[ Vfdmod ] An easy VFD control over MODBUS RTU

Category: HAL

I've been having issues with MB2HAL and an L510 VFD rebrand. I was hoping to try VFDMOD but unfortunately, the ARM DEB package is armhf and I am using an Rpi 5.Early days for my linuxCNC'ing, but....Is it possible to repackage for arm64 from 32bit?Also thought I'd attach the wiki here just in case. 

This browser does not support PDFs. Please download the PDF to view it: Download PDF

  • tommylight
  • tommylight's Avatar
16 Apr 2025 09:12
Replied by tommylight on topic Linux_Mint_22.1_LinuxCNC_2.10.iso

Linux_Mint_22.1_LinuxCNC_2.10.iso

Category: Installing LinuxCNC

Try an add on network card, or a USB to LAN adapter.
  • meister
  • meister
16 Apr 2025 09:10
Replied by meister on topic Custom interface board questions

Custom interface board questions

Category: General LinuxCNC Questions

why something new again ?

there are now enough projects, why not bundle the work?


- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?

RIO calculate the offset and scaling inside the hal_component


- motor acceleration and max speed: the same question :)

and this inside LinuxCNC and the PID controller
  • tommylight
  • tommylight's Avatar
16 Apr 2025 09:10
Replied by tommylight on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

Always use --show at the end of latency histogram, it will show the number of excursions that are not inside the visible area of the histogram, but they can be seen as multicolored columns on both sides of the histogram.
Also, use --nobase if there is no need for the base period, it adds more timing strains to CPU that will mess with the servo period latency results.
For both periods
latency-histogram --show
For servo period only
latency-histogram --nobase --sbinsize 1000 --show
  • tommylight
  • tommylight's Avatar
16 Apr 2025 09:02
Replied by tommylight on topic Custom interface board questions

Custom interface board questions

Category: General LinuxCNC Questions

Now to my questions:
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
- motor acceleration and max speed: the same question :)

 

In LinuxCNC, in the ini file.
  • Grotius
  • Grotius's Avatar
16 Apr 2025 08:02
Replied by Grotius on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

Hi,

Before starting to change kernels etc. I thought maybe first do the latency-histogram test.
I did this on 2 different pc's.

From what i read here : max us > 100 = is bad.
Is this value both the same for base- & servo-thread?
Or maybe i am reading the histogram not correct.

 
 
 
  • ajar171
  • ajar171
16 Apr 2025 07:55 - 16 Apr 2025 08:41
Custom interface board questions was created by ajar171

Custom interface board questions

Category: General LinuxCNC Questions

Hi everyone!

Long time lurker here :)

Being fed up with the random avaiability of Mesa hardware in the EU, I decided to start designing an open source interface board. The schematics and PCB designs are almost finished, the firmware works so far, that I have communication between a development board and LinuxCNC and can control digital and analog inputs and outputs, read encoder inputs, etc.. So far so good...

Now to my questions:
- encoder scaling: where is it applied with a Mesa board? In the FPGA (did not find anything in the VHDL) or the hostmot2 driver or in LinuxCNC main software?
- motor acceleration and max speed: the same question :)

Thanks in advance!



 
  • Aciera
  • Aciera's Avatar
16 Apr 2025 06:16 - 16 Apr 2025 06:30
Replied by Aciera on topic Remap M6 in python

Remap M6 in python

Category: General LinuxCNC Questions

The task check to avoid execution on load can also be put into the ngc remap like this:
o<g123remapwrapper>sub
o100 if [#<_task> EQ 1]
M66 L0 E0           ;force sync, stop read ahead    
(call your python remap here)
M66 L0 E0
o100 endif
o<g123remapwrapper>endsub
m2


Also, as you have already found out, the 'print()' statements are actually executed during read ahead. If you want messages from the command queue you could use something like this:
    self.execute('(msg,your debug message here)')
  • unknown
  • unknown
16 Apr 2025 05:54
Replied by unknown on topic 7i92 firmware issue

7i92 firmware issue

Category: Driver Boards

Of course, having a "senior moment".
  • Aciera
  • Aciera's Avatar
16 Apr 2025 05:36 - 16 Apr 2025 06:49
Replied by Aciera on topic Remap M6 in python

Remap M6 in python

Category: General LinuxCNC Questions

Python remaps are tricky to get right. I'm no expert but I have done a lot of trial and error during my work on Tilted Work Plane codes which uses a fairly complex python remap (although no M64, M65 usage).
github.com/LinuxCNC/linuxcnc/blob/master...ting/python/remap.py

On this background I would like to point out a few general things:

You might want to put something like this at the beginning of your remap so it does not execute on load:
if self.task == 0: # ignore the preview interpreter
    yield INTERP_EXECUTE_FINISH
    return INTERP_OK

Also note this restriction for the 'yield' feature:
 
linuxcnc.org/docs/html/remap/remap.html

which means that code like this is not allowed:
            if router_down:
                print("Raising Router (P14)")
                self.execute("M64 P14")
                yield INTERP_EXECUTE_FINISH
                time.sleep(2)
                self.execute("M65 P14")
                yield INTERP_EXECUTE_FINISH

instead you could use:
            if router_down:
                print("Raising Router (P14)")
                self.execute("M64 P14")
                self.execute("G04 P2")
                self.execute("M65 P14")



Premature execution of the python remap by the read ahead may also be a problem. While 'yield INTERP_EXECUTE_FINISH' at the beginning would prevent that it would also bar the use of 'self.execute()' after it (as pointed out above). My usual workaround is to call the python remap through an ngc wrapper like this:

o<m6wrapper>sub
M66 L0 E0                                                   ;force sync, stop read ahead    
(call your python remap here)
M66 L0 E0
o<m6wrapper>endsub
m2
  • electrosteam
  • electrosteam
16 Apr 2025 04:50
Gmoccapy Modal Display was created by electrosteam

Gmoccapy Modal Display

Category: Gmoccapy

Starting to use G54 and G55 to enable two job locations - new to me.
Test run a short program with G55 in the header.

In Axis, the Modal Display changes to G55 when a program is run, then back to G54 on completion.

In Gmoccapy, the Modal Display stays at G54, even though the DRO Display shows G55 while the program runs.

In each case, the DRO Display correctly shows the G55 Offsets and coordinates during the run time.

I think this must be a bug.
If so I can live with it.


 
  • notJamesLee
  • notJamesLee
16 Apr 2025 04:40
Replied by notJamesLee on topic Determining Angular Scale - Help w/ Microsteps

Determining Angular Scale - Help w/ Microsteps

Category: Configuration Tools

youre 100% right, not sure where i got 533 from.

I set it to 600 and its still over shooting. Probably about 1.125 rotations again.

I am having trouble believing its the driver because with the 1600 it works perfectly and repeatable (not sure that's a word). 

Maybe i need a sanity check on the layout of the belt system (simple diagram) attached. I dont think the tensioner (idler gear) makes any difference in the belt ratio calc (shout out uni for that one)
  • lrak
  • lrak's Avatar
16 Apr 2025 04:18
Replied by lrak on topic LinuxCNC 2.9.4 Released

LinuxCNC 2.9.4 Released

Category: Installing LinuxCNC

2.9.4 is released - but not in forum.linuxcnc.org/29-forum-announcements? 

Looking via Debian - it appears this is only in sid=unstable - so not yet stable or testing - so your install instructions won't work for anyone running anything other than unstable.

That being said, I currently have 2.9.0~pre1+git20230208.f1270d6ed7-1+deb12u1  under bookworm.
And have had some random resets.. Is there a list of what is fixed in 2.9.4 ?

So to install in bookworm you would have to install half of testing as dependencies.

I'm not complaining - like seeing the progress, but hope this might help others that run stable=bookworm. 

I put trixie on a laptop for non linuxcnc - runs well, but lots of libs are getting updated at a high pace as the freeze has been approaching .  trixie is supposed to release sometime in the second half of the year - when it is ready.
[color=#000000]The following packages have unmet dependencies: [/color]
linuxcnc-uspace : Depends: python3 (>= 3.13~) but 3.11.2-1+b1 is to be installed
                  Depends: libc6 (>= 2.38) but 2.36-9+deb12u10 is to be installed
                  Depends: libglib2.0-0t64 (>= 2.12.0) but it is not going to be installed
                  Depends: libgtk-3-0t64 (>= 3.11.5) but it is not going to be installed
                  Depends: libgtk2.0-0t64 (>= 2.8.0) but it is not going to be installed
                  Depends: libpython3.13 (>= 3.13.0~rc3) but it is not going to be installed
                  Depends: libstdc++6 (>= 13.1) but 12.2.0-14 is to be installed
                  Depends: libtirpc3t64 (>= 1.0.2) but it is not going to be installed
                  Depends: libgtksourceview-4-dev but it is not going to be installed
[color=#ff5454]E: [/color][color=#000000]Unable to correct problems, you have held broken packages.[/color]

Hope this is helpful.
 
  • electrosteam
  • electrosteam
16 Apr 2025 04:17
Gmoccapy Touch-Off Offsets was created by electrosteam

Gmoccapy Touch-Off Offsets

Category: Gmoccapy

3-axis mill with RPi 4B and LC 2.9.3 from Download page, and Gmoccapy 3.4.6 - runs a job fine.

Offset Values:
In Axis, Touch-Off populates with a value generally within 0.001 mm of the value entered
Minor corrections are often successful, but sometimes ignored.

In Gmoccapy, Touch-off x=0, y=0, z=0, G54 populates with a value, like z=0.511.
    - Touch-off often leaves small errors on the DRO, like 0.008 mm.
    - I seem to run in circles trying to get the Offsets Page to agree with the DRO display, the G54 values, and the current position.

Suggestions ?
 
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