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  • LCR
  • LCR
12 Mar 2025 21:39 - 12 Mar 2025 21:47

Problems with Lichuan Ethercat servo drive

Category: EtherCAT

Has anyone actually run these servos? I'm trying to tune these, which was going well. However I'm having an issue where the drives randomly develop an offset. Not following error. I can use the pendant and the same offset stays.  I can manually force the motor back and forth, and the offset stays. When I turn the drives off, and on, the offset dissapears. I put a dial on and the offset is real. The encoder is not loosing position, it seems to be something in the drive. Any ideas? Anyone seeing this? Anyone not? 
  • IronManDylan
  • IronManDylan
12 Mar 2025 21:38
Board not found when trying to flash mesa was created by IronManDylan

Board not found when trying to flash mesa

Category: General LinuxCNC Questions

Hi,

I am trying to flash my mesa 7i96s so that it can work with my 7i85. 

When I use the command 'mesaflash --device 7i96s --addr 10.10.10.10 --dbname3 7i85s --readhmid' I am getting a read out from the board (the pin funcs under 7i85d say "none". But when I use the command 'sudo mesaflash --device 7i96s --write 7i96s_7i85d.bit' mesaflash is saying "No 7I96S board found".

Does anyone know what is going on here? Thank you.
  • PCW
  • PCW's Avatar
12 Mar 2025 21:10 - 12 Mar 2025 21:26
Replied by PCW on topic OLD Lathe conversion to a CNC

OLD Lathe conversion to a CNC

Category: Turning

You could try reducing the servo thread rate to 2 ms
(and all stepgen P terms to 500)

You could also see if pinning the Ethernet IRQ to the top processor helps:

 

File Attachment:

File Name: pinirq_2025-03-12.txt
File Size:1 KB


first chmod +x pinirq.txt
then
sudo pinirq.txt [ethernet device name]

And see if that helps (it will only last until a reboot)


 
  • yoshimitsuspeed
  • yoshimitsuspeed
12 Mar 2025 21:01
Replied by yoshimitsuspeed on topic Setting up Probe Basic on my machine questions and issues

Setting up Probe Basic on my machine questions and issues

Category: QtPyVCP

Thanks
Haven't gotten back to the touch probe stuff but hope to soon.

Currently a couple other issues. The first is definitely PB related.
Every time I start PB it puts the coordinate readout in inches when linear units is set to mm in the ini.
G21 does switch it but it's still annoying. How do I set it so everything starts and always stays in mm?


The second I don't remember if this was an issue in other UIs but if I hit home x or y it does not lift Z before homing.
I see there is a go to home file in subroutines which I assume is used for home all but don't see anything specifically for individual axis. Would I need to create a subroutine for x and for y to get it to Z0 before homing them?
  • d12k6
  • d12k6
12 Mar 2025 20:37 - 12 Mar 2025 20:38
Replied by d12k6 on topic Arduino IO Expansion

Arduino IO Expansion

Category: Show Your Stuff

Hello, is it possible to create "internal buttons"? I mean not a physical button, but only in the software e.g.
if(value == x) internal_button = true
  • besriworld
  • besriworld
12 Mar 2025 19:44 - 12 Mar 2025 19:46
Replied by besriworld on topic OLD Lathe conversion to a CNC

OLD Lathe conversion to a CNC

Category: Turning

One time I only received a warning message.
I did the latency test using the script at @ tommylight
Most of the time the maximum delay is 190us
I think when it jumped up 700us I saved a file to a flash drive.

What should I do now?
 

File Attachment:

File Name: 1741790691.hw.txt
File Size:4 KB

File Attachment:

File Name: 1741790691.lat.txt
File Size:624 KB
  • webbyguy
  • webbyguy
12 Mar 2025 19:38
Replied by webbyguy on topic Can't eek out that last bit of jitter

Can't eek out that last bit of jitter

Category: General LinuxCNC Questions

Because I couldn't figure out how to disable smt for my fx 8350 cpu with the rtai kernel.  I tried switching to an X6 1090T.  I also disabled the thermal limits in bios.  My max jitter reduces to +/-14.4us (with all points within +/-5us except the ones right at +/-14.4us.  I wish I had taken a picture.)  I then turned the thermal limits back on, and I got about the same result I was getting for the fx 8350.  So, I turned the thermal limits back of again, but it didn't go back to the +/-14.4us max jitter.  It still looked the same as the fx 8350.  I tried resetting and messing with some other settings, and I can't get back to that +/-14.4us or better.  With some systems, is there some random timing at startup that causes different latency results even though there were no settings changes?
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