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  • rodw
  • rodw's Avatar
22 Jul 2026 02:39

Livestream Discussing LinuxCNC and MTConnect 27 July 2026 11:00am GMT+10

Category: Off Topic and Test Posts

Just putting this out there as advance notice. 27 July 11:00am Brisbane, Australia time GMT+10:00

I was approached by Freecad Developer Brad Collette to discuss work he's done to bring MTconnect and LinuxCNC. He and I are going to do a Podcast style discussion on this topic.
youtube.com/live/b_S-p2nylr8

I've never done anything like this and if nothing else it should be worth a laugh seeing if I can put it together with me in Australia and Brad in the USA! :)

MTconnect is a standards based system used by all of the major CNC machine manufacturers that publishes read only machine parameters. I was blown away how MTconnect saved an automotive factory from incurring downtime costing $1.8m just because the data showed a motor on a CNC machine was failing..... So I for one is keen to hear what Brad has to say... 
  • NWE
  • NWE's Avatar
22 Jul 2026 02:28

Ursviken Pullmax Optima 130 press brake retrofit with 4 axis backgage

Category: Show Your Stuff

This works. Today I bent a 1.5" x 10" x 3/16" pc. of steel at 90 degrees. Some more loose ends then I will share the config. I am starting to plan the gui for it. I ended up with two position pid's, one per side, then one sync pid for correcting the tilt between left and right sides. The sync pid has a commanded value = 0 and gets its feedback from the difference between Y1 and Y2 then acts by slowing the one that is ahead.
  • Buzzcut
  • Buzzcut
22 Jul 2026 02:05
Thank You! was created by Buzzcut

Thank You!

Category: Off Topic and Test Posts

This goes out to everyone on this forum. Anyone who has ever asked a question and for all those who have taken time out of there day to answer those question. Thank you! I have several machines that are now all on Linuxcnc and running great. Without everyone's help in this forum it would have not been possible. There are too numerous individual's to mention so this goes out to everyone. Again THANK YOU!
  • ihavenofish
  • ihavenofish
22 Jul 2026 01:57
Replied by ihavenofish on topic Mini wannabe datron build

Mini wannabe datron build

Category: CNC Machines

I've not thanks to my patch confirmed that the drives are resetting. statusword goes to 0. controlword to 6 on the same frame, just after the pll spike. on that same frame the encoder goes to 0 or somethings a random bad number.

Joint error does not always trip (without the patch). i guess it depends how long the drive takes to recover.

Im not monitoring to see if its one or all drives, in what order, is it only the omrons, what if i swap cables around, etc.

Fun fun.
  • COFHAL
  • COFHAL
22 Jul 2026 01:37
Manual gearchange 9 speeds was created by COFHAL

Manual gearchange 9 speeds

Category: Advanced Configuration

I'm converting a parallel lathe to Linux CNC. It has nine speeds, which are manually changed using two levers with three positions each. The motor always runs at the same speed, and direction changes are achieved via electromechanical clutches. I want to control the motor speed at each speed using a NIETZ AT20 VFD with speed feedback from an encoder. Therefore, the motor speed at each speed will vary between 0 and 1630 RPM, and the gearbox will convert this to a range between 0 and the maximum of that range. For example, range 1 would be from 0 to 36 RPM, range 2 from 36 to 90, range 3 from 90 to 155, range 4 from 155 to 200, and so on. I know there's a gearchange component, but it only supports two speeds.  For the speed selection logic, I think I can use 3 instances of lut5 and mux16, what I don't understand is if I can use the gearchange component or if a version that handles 9 speeds is required.
  • cmorley
  • cmorley
22 Jul 2026 01:35

"Probe Height of the current tool" button not active in versatool

Category: Qtvcp

The button is disabled because the routine is not tested enough.

last time we worked on it:
forum.linuxcnc.org/qtvcp/51138-qtdragonh...-maker-space?start=0
  • ronthomp
  • ronthomp
21 Jul 2026 21:02

"7i92+7i76 on P2: SSerial detects board but registration fails with EAGAIN"

Category: Driver Boards

We, me and the ai, tripped over what may be the root cause. I will have better power supplies tomorrow and report back. Thanks for your time and attention!
  • Ismacr63
  • Ismacr63
21 Jul 2026 20:56
Replied by Ismacr63 on topic Some problems with probe basic lathe

Some problems with probe basic lathe

Category: QtPyVCP

I wanted to pick this up again to try to get the macros working, but I've noticed that the conversational tab in Probe Basic Lathe no longer appears. Would it be possible to get it back?
  • tommylight
  • tommylight's Avatar
21 Jul 2026 20:47

"7i92+7i76 on P2: SSerial detects board but registration fails with EAGAIN"

Category: Driver Boards

This is getting aggravating, you should be capable of checking a simple LED and reply here with yes or no.
Power the Mesa board, start LinuxCNC, look at the Mesa board, does a red LED turn on?
That is NOT Linux, nor something ChatGPT can answer for you.
  • ronthomp
  • ronthomp
21 Jul 2026 20:34

"7i92+7i76 on P2: SSerial detects board but registration fails with EAGAIN"

Category: Driver Boards

From the ai...because my brain won't retain Linux. 
That's a genuinely significant lead — if PathPilot's Tormach-modified hostmot2 driver never gets tested against SSerial hardware at all (since Tormach's own machines don't use it), it's entirely plausible they introduced a real bug in that code path that nobody would have noticed. That would explain everything we hit today far better than any config mistake on our end.On the red LED question — I can't answer that myself, but here's the thing: we're not currently running the SSerial-enabled bitfile right now (we're back on the plain x1D raw-GPIO config for this E-stop pin testing). So that check will need to wait until we go back to testing the x2D/SSerial setup again. Worth flagging to PCW in your reply that you'll check and report back once you re-test that configuration — and it's a good, easy thing to note for next time (literally just look at the 7i92 board's LEDs during the failure).
And a dumb question from me, is it possible to revert to the Linuxcnc hostmot2 driver? I'm guessing not. Thanks!
  • tuxcnc
  • tuxcnc
21 Jul 2026 20:16

Gantry oxyfuel / plasma type machine from scratch

Category: General LinuxCNC Questions

Ethercat is very good for motors, but for slow I/O is only expensive and modbus may be better choice...

 
  • PCW
  • PCW's Avatar
21 Jul 2026 20:14

Retrofitting a 3-axis VMC with DC servos - guidance needed

Category: Driver Boards

You can drive small relays with the enable OPTOs
but make sure that the relay coils have flyback diodes.
  • tommylight
  • tommylight's Avatar
21 Jul 2026 19:55
Replied by tommylight on topic Gantry oxyfuel / plasma type machine from scratch

Gantry oxyfuel / plasma type machine from scratch

Category: General LinuxCNC Questions

I see the board has only one input for the encoder feedback. But I have 3 drives, so should I leave the encoders
signals from the drive to linuxcnc out ?

Yes you should leave them out, as noted above the only usable way for DMM drives is in Position mode as they have a delay in position signal outputs.
Also the encoder input will be used for THCAD if you want plasma.

Or there is a way to connect all 3 encoders to the board ?

Yes there is, Mesa 7i85 or 7i85S should have 4 encoder inputs.

Also has LinuxCNC some settings to make the preheat , and open the various gasses vales at ceartain time already in or should I be doing this from zero up ?

No, not per se, but LinuxCNC can be programmed as you need it, so a simple G04 P1800 will make the machine wait for 30 minutes at the first cut to preheat the material.
Same for outputs and solenoids, everything can be automated and even add a side panel with settings and buttons and stuff.
  • 5_Zylinder
  • 5_Zylinder
21 Jul 2026 19:35
Replied by 5_Zylinder on topic Hurco BMC 30 AP

Hurco BMC 30 AP

Category: CNC Machines

Thanks for the help.I’ve now implemented everything just as Aciera described. The error persists. I think a directory is still missing here?
  • PCW
  • PCW's Avatar
21 Jul 2026 19:30 - 21 Jul 2026 19:31

"7i92+7i76 on P2: SSerial detects board but registration fails with EAGAIN"

Category: Driver Boards

May be an introduced PathPilot bug since their hostmot2 driver has been
changed from LinuxCNC's version and Tormach doesn't use any sserial devices.

When the error happens, do you get a red LED illuminated on the 7I92?
 
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