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  • NWE
  • NWE
17 Jan 2026 23:59

Solving the USB Latency Dogma for HMI/MPG: Technical Feedback Request

Category: Driver Boards

Subject: Solving the USB Latency Dogma for HMI/MPG: Technical Feedback Request

Hi all,

I’d like to open a technical discussion about a project I’ve been working on, io_decoder, focusing on the software solution I've implemented to handle USB communication within LinuxCNC.

 

+1
More hardware support for LinuxCNC.

I am very much interested in this project. I have experience with embedded mcu applications, but zero experience doing development with the USB stack. Last year I was thinking that this type of I/O via USB connection should be developed, but did not find time to start on it.

I like the mechanical format of your boards, for edge-mounting them on a DIN rail.

Ethernet is very good for EMI prone applications, however, there are plenty use cases with less EMI where USB is just fine. For example, I have LinuxCNC reading an industrial position sensor through a cheap USB to RS232 dongle going on about 10 years by now. It substitutes for an encoder, providing feedback for a relatively slow moving PID controlled axis. This is on a setworks on a lumber mill, to set board thickness. The only interference problems they've had was of a mechanical nature, when a log jams in the wrong spot and rams the $2500 USD magnetorestrictive position sensor. It gets all bent out of shape, but lasts more than 5 years.
  • Mark Kraus
  • Mark Kraus
17 Jan 2026 23:46

Trying to move from UCCNC to Linuxcnc and using 7i96s but having trouble

Category: StepConf Wizard

Got it .  Spindle running and all axis running now just need to tune axis and get limits and encoders set up this is amazing after so many days I think this is going to be worth it because I have more of these conversions to do and I have learned so much it is amazing.  Without even tunning the spindle is behaving really well with no feedbac yet.  I was having trouble in uccnc wtih overshooting and taking awhile to get settled.  Has anyon e noticed smoother operation with linuxcnc vs other s when they switched?  The exciting thing for me is the prospect of ridgid tapping.  .  My liimit switches are only two wire.  Is this going to work?  I have a threee wire home swithc set up hall sensor
 
  • MaHa
  • MaHa
17 Jan 2026 22:31
Replied by MaHa on topic G-Code Schleifen

G-Code Schleifen

Category: Deutsch

Mit dieser Anpassung sollte das vollständig durchlaufen

    #2 = [#2 + 1]
   #1 = 0
o101 endwhile
  • PCW
  • PCW's Avatar
17 Jan 2026 22:18
Replied by PCW on topic need firmware for mesa 7i76eu+7i85+pwm

need firmware for mesa 7i76eu+7i85+pwm

Category: Driver Boards

7I76EU firmware for 7I85 on P1, and 1 PWM on P3

 

File Attachment:

File Name: 7i76eu_7i7...1pwm.zip
File Size:298 KB



After doing this I also had a thought that you could use a spare RS-422
output on the 7I85 for the PWM output, so you get a  buffered output
rather than a bare FPGA pin.
  • grandixximo
  • grandixximo's Avatar
17 Jan 2026 22:09 - 17 Jan 2026 22:12
Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

 
 Thats a dodecadon lol
I was planning to make rounded corners actually be radiuses in the gcode G2 G3, probably next week, unless you want to oblige, many thanks again Rüdiger!
  • advangrootel
  • advangrootel
17 Jan 2026 22:05
Replied by advangrootel on topic need firmware for mesa 7i76eu+7i85+pwm

need firmware for mesa 7i76eu+7i85+pwm

Category: Driver Boards

Reply to PCW with:
"Yes, that's correct:

7i85 encoder card on P1 (first DB25 expansion connector)
PWM on P3 (second DB25 expansion connector) for laser

Or if it's easier, PWM on P1 and 7i85 on P3 - whichever works best for the firmware. i use all 5 stepper outputs. so any port or pin you think is best will do.
  • unknown
  • unknown
17 Jan 2026 21:59

Solving the USB Latency Dogma for HMI/MPG: Technical Feedback Request

Category: Driver Boards

I'm a little unconvinced how changing to USB would have an affect on the "wiring nightmare or EMI issues".
At the end of the day one still has to make a connection from the input or output device on a control panel to the interface board.
The wiring nightmare and/or EMI issues will be a creation of the practices used by the person doing the work. In summary these issues are going to be site specific.
From memory Mesa did have a USB interface board, but is now listed as obsolete. It also supported EPP, only mentioned for completeness.
  • ruediger123
  • ruediger123
17 Jan 2026 21:50
G-Code Schleifen was created by ruediger123

G-Code Schleifen

Category: Deutsch

Ich versuche gerade eine while Schleife in einer while Schleife zum laufen zu bringen, die äusere Schleife wird nur ein mal ausgeführt,.

nc-code

F10000
#<radius> = 10
#<anzahlEcken> = 3
#<winkel> = [360 / [#<anzahlEcken>]]
#<verrundung> = 0.001
#<drehungUmC> = 60
#<wiederholungen> = 5

G10 L2 P1 R[#<drehungUmC>]
G64 P[#<verrundung>] Q0.0
#1 = 0
#2 = 0

o101 while [#2 LT [#<wiederholungen>]]
    o201 while [#1 LT [#<anzahlEcken> + 1]]
        g90 g1 x[COS[#1 * #<winkel>] * #<radius>] y[SIN[#1 * #<winkel>] * #<radius>]
        #1 = [#1 + 1]
    o201 endwhile
    #2 = [#2 + 1]
o101 endwhile
m2

ist es überhaupt möglich ?

Gruß
Rüdiger
 
  • bnet
  • bnet's Avatar
17 Jan 2026 21:50

First Analog Build - 7i97 - Anilam - Issue enabling machine

Category: Basic Configuration

I am working on integrating my first analog servo build. 7i97 and Anilam drives. I am following the steps here . I have the encoder scaling correct but when I go to enable the machine, there is a brief moment of runaway before I get two errors: 
"joint 1 following error"
"could not switch the machine on. is limit switch activated?"

I am only working on joint 1 at the moment. 
No limit switches are in use at the moment. 

I have tried inverting 'output scaling' and 'encoder scaling' in every possible combination on the configuration page. 

Any suggestions? 

Thanks! 
  • PCW
  • PCW's Avatar
17 Jan 2026 21:27
Replied by PCW on topic need firmware for mesa 7i76eu+7i85+pwm

need firmware for mesa 7i76eu+7i85+pwm

Category: Driver Boards

Do you mean 7I85 on P1 and PWM on P3  (on 7I76EU P1 is the first parallel expansion connector and P3 is the second)
  • rodw
  • rodw's Avatar
17 Jan 2026 20:43

Solving the USB Latency Dogma for HMI/MPG: Technical Feedback Request

Category: Driver Boards

Very interesting. A few points.
1. You don't say anywhere how to get the boards which are very well thought out. I'd love to test it.
2. New software to go into Master branch (2.10) which will be released in a few months.... This needs to be tested on this version (I'm finalizing a how to build linuxcnc video on my @MrRodW YouTube channel
3. Reformulate (or recreate) the git repo so this can be packaged as a PR to Linuxcnc. This would give you the best chance of success with your hardware project.
4. Your business model is similar to Mesa's so having an open source driver for your hardware in the Linuxcnc distro is not really controversial.
  • ruediger123
  • ruediger123
17 Jan 2026 20:30
Replied by ruediger123 on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

I revised the NC program and made the number of corners and the radius parameterizable.
  • advangrootel
  • advangrootel
17 Jan 2026 20:12
need firmware for mesa 7i76eu+7i85+pwm was created by advangrootel

need firmware for mesa 7i76eu+7i85+pwm

Category: Driver Boards

Hi PCW,

I need custom firmware for 7i76EU with:
- 7i76 daughter card on internal SSerial (currently working)
- 7i85 encoder card on P2 (currently working)  
- PWM generator on P1 for 20kHz laser control



Can you create firmware combining all three?

Board IP: 192.168.1.121
5 axes: XYZAB vfd rs485 controls spindle direct on the mini pc with rs485 output

Thanks!
  • Lili
  • Lili
17 Jan 2026 20:07
Replied by Lili on topic Single LC10E-600W Driver Not Responding

Single LC10E-600W Driver Not Responding

Category: EtherCAT

In linuxcnc 2.9.8 I genereted ethercat-conf.xml file from slaves with command:
ethercat pdos
ethercat xml > ethercat-conf.xml

can you help me to create basic hal and ini file for my xml?
  • reboots
  • reboots
17 Jan 2026 18:10 - 17 Jan 2026 18:14
Replied by reboots on topic How do I lubricate correctly?

How do I lubricate correctly?

Category: Milling Machines

That might be a question for Sorotec. They also offer grease guns and lubrication products, and should be able to make a recommendation:

www.sorotec.de/shop/Tools-and-utilities/...roducts/Lubrication/

HGH20CA is a Hiwin part number, although I suspect that Sorotec is selling generic clones. Hiwin has an extensive linear guide and ballscrew lubrication guide at the following link (737KB PDF). They recommend viscosity grade NGLI 2, and list specific greases (see attached table).

www.hiwin.com/wp-content/uploads/lubricating_instructions.pdf
 
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