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I discovered Flex GUI by chance with this post, it's a great job, thank you very much.

The last line, which says to look at the exampleconfig a gantry machine, was also only semi helpful since 1. This example config wasn't even available on my variant of linuxcnc, and 2. Since there is nothing helpful in the example config,

Not sure why that should not be available on your installation:
github.com/LinuxCNC/linuxcnc/tree/2.9/configs/sim/axis/gantry

However your issue is not 'joint' jogging but axis jogging as your machine seems to home correctly.

If you do get the step/rid servos, they will have encoder wired to their drives, so you can look at it a simple stepper system, and if you can use the scales wired to LinuxCNC, that would also close the loop in LinuxCNC, making any backlash in the system less impactful. This from LinuxCNC's point of view makes it velocity mode where LinuxCNC controls the position.
That can all be done with 7i96S and 7i85.

I'll have a look, I can't remember. I did start with RT-Prempt but latency was poor.

I'll have a go at a fresh pull, or git checkout your updated work. I'm so worried to over-write anything though, not because I doubt any of you beyond incredible talent and knowledge, but because the existing version I've rooted for is flawless. Spi W5500 + gowin that is. I actually made quite a few parts before leaving, Nothing to regret having jumped in!!

Always good to keep updated and in the loop anyway, so I'll do that. You sound good man, good vibes, Keep it up!

Gitano's creativity is great. Doesn't look Cult'ish enough though, he needs a tattoo + blink one of his eye and it's sorted

Hi Guys!
I started a new project, a retrofit of a Hermle UWF 700. It was made in 1984, 40 years ago. The mechanical condition is very good, no signs of wear anywhere, although that might also be due to the automatic lubricator. The mill has a 18-speed gearbox, maxing out at 2000rpm's. The electronics were not working anymore, so I only got the machine itself. I did get a lot of nice documentation however. Tool clamping works by a hydraulic cylinder. The gears are lubricated with an oil spray system with a seperate oil pump.This is what the Hermle looks like: 

 

And inside my small shed:



The ways still look pretty good:



I paid 2000€ for it, which seems fine.

My Plans:

• I want to use Servos for the three axis. I am currently thinking about 660 Watt JMC servos or some chinese ones, since I can not get my hands on anything else.
• The machine already has glass scales on all three axis. I think it should be possible to use them with a mesa board if I use three Heidenhain EXE 602 E and use them as feedback in a PID loop.
• I have a 7i96s with a 7i85, which could be able to do the trick If I use the step/dir interface of the servos, which only works in positional mode. But I read multiple times here on the forum that velocity mode is better. Otherwise I will buy something like the 7i97T.
• I might increase the low spindle speed by using a belt drive, at least 4000rpm would be nice.
• I might use an Arduino to shift the 18 gears of the gearbox. That seems simpler to me rather than using LinuxCNC to handle the shifting.

I will post updates from time to time.

Manuel

Also I don't think pncconf supports the 7I95/7I95T but MesaCT does.

Malteser01 wrote:

I did check, and no. It rotates correctly. I tested with a separate hal and ini set, where I mapped the outputpins of the moving y to the not moving (faulty) one. It moved as expected.

Ok, thank you.

Buffer overflow and segmentation faults all over.
Do you still have the RT-Preempt kernel installed? If yes, start with it and try running your config, might be something with RTAI kernel as i have seen those errors before with it.

Thank you.

 

Hi!
@zmrdko : 
thank to you and other experienced users in this thread for educating other folks and providing invaluable linuxcnc knowledge. I have some follow up questions on one of your posts:

- Would you mind sharing which z390 motherboard manufacturer / series do you have that allowed you to achieve 2.3us latency?
- What Intel PCIe Ethernet card did you choose? I saw that in this thread: gitlab.com/etherlab.org/ethercat/-/issues/104 they recommended "cheap realtek 100mb/s" ethernet card.
- Did you go with intel integrated graphics?
- IIRC, you (or maybe other user?) mentioned that with newer kernel the performance dropped from 8kHz (at 4.19rt) to 4kHz.
- Were there any other factors that positively affected performance besides the servo thread latency to get 8kHz? (e.g. ethernet roundtrip was quick)
- Have you measured how long does it take to execute your HAL components in each control cycle?
- Is there some other computer hardware that you leaned about and would be eager to try out with EtherCAT?

I hope this is not too much off-topic. Please correct me if there is a better form to ask these questions.

Thank you for your consideration,
Regards, Jakub

slowpoke wrote:

Bunch of questions, Hopefully someone can fill in a few blanks as I formulate a plan for the lathe.

I'm using Axis for my mill and I'm completely happy with it. I'm now considering using LinuxCNC for my lathe. I definitely want to maintain manual operation capability.

Presently I have a derivative of the Clough42 ELS with feedback from the spindle and a stepper driving the leadscrew for threading. I like the simplicity of selecting various thread pitches metric and SAE electronically.
1) I don't suppose LinuxCNC has this "ELS" capability?

2) I also have DRO scales. Assuming I will use a MESA board, is it possible to connect the scales to the MESA board and use LinuxCNC as a glorified DRO without actually driving any steppers/servos?

3) Assuming for the moment I can use LinuxCNC simply as a DRO, what MESA board(s) would be a good fit for say max 3 encoder inputs and possibly up to 3 steppers later?

 I have a RaspberryPi of some sort and I might try using it for the LinuxCNC for both space and $.

4) What RaspberryPI's are likely to have acceptable latency and what versions should I avoid?

 I find the Axis GUI a good fit for my needs on the mill, what GUI is a good fit for lathe control?

Much appreciated.

 

I won't comment on GUI choice(s) here - those are personal preferences.  Regarding your other questions:

• Yes, LCNC has "ELS" capability.  Not in a turn-key configuration, but there's no reason you can't set LCNC up to act like your ELS.  All the elements are present: spindle encoder + Z-axis positioning motor + configurable logic.
• Yes.  And LCNC already has a "DRO" mode.  See  linuxcnc.org/docs/devel/html/gui/mdro.html
• You can read my long-winded post here:  forum.linuxcnc.org/27-driver-boards/5160...i-buy?start=0#292576
  • I'm not an expert, but I think the absolute cheapest Mesa combination to get an FPGA card (required) and 3 axis/spindle encoder inputs & step/dir outputs is a 7i92 (any variant) and a 7i85s.  You'd still need something else for IO, but that depends on your particular setup.
  • If your IO needs are moderate, a 7i96s and 7i85s would get you the IO and keep packaging to two (vs three) boards.
• Based on very little personal experience, Rpi's usually have decent to very good latency and potentially not-so-good user-interface response.  i.e. 'laggy' if using a power-hungry GUI.  If you are using Mesa hardware you don't have to worry about latency with an Rpi. 
  • I've got an Rpi5 and while I'm not using it (right now), it was just fine when I tested it with LCNC and Probe Basic (no interface lag).
• Lathe GUI - any GUI is fine except Axis.
  

I can't post them easily now, no. Sadly I don't have a working PC at home which complicates matters.

I did however post them earlier in this thread, the hal and ini stayed mostly the same, and any changes I did, did not result in properly functioning movement.

I did check, and no. It rotates correctly. I tested with a separate hal and ini set, where I mapped the outputpins of the moving y to the not moving (faulty) one. It moved as expected.