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  • tommylight
  • tommylight's Avatar
15 Sep 2025 16:31
LinuxCNC latency and jitter improvements with PREEMPT_RT kernel parameter tuning was created by tommylight

LinuxCNC latency and jitter improvements with PREEMPT_RT kernel parameter tuning

Category: Computers and Hardware

Bumped into this today, goes in great detail on how to tweak and tune for good latency:
dantalion.nl/2024/09/29/linuxcnc-latency...arameter-tuning.html
Not my article.
  • tommylight
  • tommylight's Avatar
15 Sep 2025 16:15 - 15 Sep 2025 16:16
Replied by tommylight on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)

Glasmaßstab EIA-422 an Mesa 7i85 (S)

Category: Deutsch

Your picture here
forum.linuxcnc.org/42-deutsch/56803-glas...85-s?start=10#334968
shows several warnings about permissions, it is not just index, so if you are running as root user, switch over or reinstall as LinuxCNC will vigorously refuse to run properly as root, as will most of the Linux "user space" software.
Also, are you using a parallel port? Why does it say that in the error report?
  • jmp97
  • jmp97
15 Sep 2025 16:11
Replied by jmp97 on topic 5-axis CNC recommendation

5-axis CNC recommendation

Category: General LinuxCNC Questions

Ok
  • PCW
  • PCW's Avatar
15 Sep 2025 15:20
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)

Glasmaßstab EIA-422 an Mesa 7i85 (S)

Category: Deutsch

When, you say  "unfortunately the result is the same" , it would be helpful if you
specified the actual results as there have been at least three separate issues discussed here.
  • WKS-3D
  • WKS-3D's Avatar
15 Sep 2025 15:04 - 15 Sep 2025 15:07
Replied by WKS-3D on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)

Glasmaßstab EIA-422 an Mesa 7i85 (S)

Category: Deutsch

What's going on with this site? It takes forever to load, or it's not even accessible. I've been trying to reply here for 35 minutes.

@tommylight
All other changes are executed, so why should it be any different with the index signal? Yes, it should be executed as ROOT user.

@PCW
 I also set the jumpers to TTL and tried it out, but unfortunately the result is the same.
Here are the HAL and INI:
 

File Attachment:

File Name: probe_basi...15-2.ini
File Size:5 KB

 

File Attachment:

File Name: hera_probe...15-2.hal
File Size:13 KB

 
  • tommylight
  • tommylight's Avatar
15 Sep 2025 14:20
Replied by tommylight on topic 5-axis CNC recommendation

5-axis CNC recommendation

Category: General LinuxCNC Questions

Please upload the pictures here on the forum, not on 3'rd party websites.
Thank you.
  • tommylight
  • tommylight's Avatar
15 Sep 2025 14:16
Replied by tommylight on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)

Glasmaßstab EIA-422 an Mesa 7i85 (S)

Category: Deutsch

Just to be sure, are you running as user ROOT ?
  • tommylight
  • tommylight's Avatar
15 Sep 2025 14:14
Replied by tommylight on topic M3-USB4X driver board

M3-USB4X driver board

Category: Driver Boards

No, this is a USB card so it will not work with LinuxCNC, or will require a lot of work to make it work.
But you can get rid of it completely and use a simple BOB (or not use a BOB at all) with a parallel port and wire the drives and switches directly.
Or replace it with Mesa 7i96S.
  • unknown
  • unknown
15 Sep 2025 14:13
Replied by unknown on topic M3-USB4X driver board

M3-USB4X driver board

Category: Driver Boards

Would require reverse engineering, ie which MCU pins are connected to which IO pins.
The MCU would need to be identified. Reprogrammed and maybe even a Linuxcnc driver written.
Connection via USB is not an option.
SPI maybe the only option for communication, so RPi family would be the easiest option, SPI is not a PC interface, generally speaking.

It it was myself I would weigh up the price of a windows machine, windows licence and a Mach3 licence (you want to go down the legal route right) and compare that to a Mesa board and a suitable PC. Or even a parallel port based system and Linuxcnc.
A lot could depend on how much your boss wants to spend and whether they are comfortable with a non windows system. Oh and quickly to deploy the machine to start making money.

Just some thinking points.
  • PCW
  • PCW's Avatar
15 Sep 2025 13:41 - 15 Sep 2025 15:03
Replied by PCW on topic 7i97T -> 7i74 -> two 7i84U (no link)

7i97T -> 7i74 -> two 7i84U (no link)

Category: Driver Boards

Do the 7I84Us have both FieldA and FieldB power supplied?

Does the 7I74 have 5V power?
  • PCW
  • PCW's Avatar
15 Sep 2025 13:36
Replied by PCW on topic Glasmaßstab EIA-422 an Mesa 7i85 (S)

Glasmaßstab EIA-422 an Mesa 7i85 (S)

Category: Deutsch

Can you post your complete hal and ini file set here?
Then I can try an duplicate your issue


Also if you know you have differential outputs on the scales,
you should leave the 7I85S jumpered for differential inputs.

Typically TTL encoder signals will not work if the interface card is
jumpered for differential signals, but differential encoder signals
will work if the interface card is jumpered for TTL signal



 
  • bernie_nor
  • bernie_nor
15 Sep 2025 13:28
M3-USB4X driver board was created by bernie_nor

M3-USB4X driver board

Category: Driver Boards

Hello,

This is a long shot. At work we have purchased a used CNC mill. It cam without a computer. And since I already use LinuxCNC for my mill, I'm tempted to also use linuxCNC for this one. The previous owner used Mach3. And the driver board looks like a generic USB Mach3 board.

Are there any chance this board could work with LinuxCNC? 

 

I know similar questions have been asked before, but the threds are old. And there were some hints regarding hacks to make this work regardless of the difference in the architecture of the real time part of LinuxCNC and Mach3. 


Cheers!
Bernie
 
  • PCW
  • PCW's Avatar
15 Sep 2025 13:23
Replied by PCW on topic 7i76E Spindle configuration

7i76E Spindle configuration

Category: PnCConf Wizard

I suspect this may be a localization bug in pncconf

If you run pncconf from the command line, does it print any error messages?
  • alangibson
  • alangibson
15 Sep 2025 13:09
No underspeed with temporary material was created by alangibson

No underspeed with temporary material

Category: Plasmac

Hi all,

I'm adding a hole underspeed feature to MetalHeadCAM . After setting a temporary material, velocity reduction with M67 doesn't change the velocity shown in the QtPlasmaC interface. It stays at 1700 mm/min the whole time.

I'd appreciate it someone can spot my error. Thanks in advance.
(Generated by MetalHead CAM for LinuxCNC QtPlasmaC)
(2025-09-15T11:29:55.159Z)
G21 (Set units to millimeters)
G40 (Cutter compensation off)
G49 (Tool length offset cancel)
G64 P0.1 (Path blending tolerance)
G80 (Cancel canned cycles)
G90 (Absolute positioning)
G92.1 (Cancel coordinate system offsets)
G94 (Feed per minute mode)
G97 (Constant surface speed off)
M52 P1 (Enable paused motion for adaptive feed control)
M68 E3 Q0 (Set velocity to 100%)
F#<_hal[plasmac.cut-feed-rate]> (Use material feed rate from HAL)
(o=0, ph=1.5, pd=0.1, ch=0.5, fr=1700)
(Path 1)
G0 Z10 (Move to safe height)
G0 X15.2 Y11.5 (Move to path start)
G0 Z1.5 (Move to pierce height)
M3 $0 S1 (Plasma torch on)
G4 P0.1 (Pierce delay)
G1 Z0.5 (Move to cut height)
M67 E3 Q60 (Reduce velocity to 60% for hole cutting)
(Native circle full arc)
G3 X15.2 Y11.5 I-3.7 J0 (Full circle counterclockwise)
M67 E3 Q0 (Reset velocity to 100%)
M5 $0 (Plasma torch off)
G0 Z10 (Retract to safe height)
G0 X0 Y0 (Return to home)
M2 (Program end)
  • gene_weber
  • gene_weber's Avatar
15 Sep 2025 13:07
MESA 7C81, DIN Tray & Ribbon Cable was created by gene_weber

MESA 7C81, DIN Tray & Ribbon Cable

Category: User Exchange

7C81 RPI FPGA board
1.5" RPI GPIO cable for 7C80 and 7C81
DIN Tray 107MM X 102MMFor 7C81, 7I94, 7I94T

The Raspberry PI, standoffs, and fans are NOT included.

Works perfectly. Selling because I bought a MASSO 3G Touch.

$75 plus shipping.
 
 

 
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