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  • Aciera
  • Aciera's Avatar
12 Jan 2025 10:06
Replied by Aciera on topic Adding 4th Axis to LinuxCNC with 7i92/7i77/7i76, Use absolute encoder or incr?

Adding 4th Axis to LinuxCNC with 7i92/7i77/7i76, Use absolute encoder or incr?

Category: Advanced Configuration

Note that some drives (even high quality ones like mitsubishi and yaskawa) have a noticeable lag in the simulated incremental encoder signal when using position loop.
forum.linuxcnc.org/10-advanced-configura...pain?start=30#193073

Absolute encoders should be very accurate but you may struggle to get the encoder data into Linuxcnc (ie to get the multiturn AND motor position ). If it does not offer the multiturn information then you would need a second signal from the rotary to indicate the correct rough orientation for the motor position to be valid. This would be very accurate if you can get a good index signal from the drive.

As an alternative you could also mount a separate incremental encoder directly on the rotary axis and use the encoder index signal for homing.
  • royka
  • royka
12 Jan 2025 10:02
Replied by royka on topic Real-time kerel not detected on patched 6.12

Real-time kerel not detected on patched 6.12

Category: General LinuxCNC Questions

Yes but we were talking about 6.12 and up, of course for 6.1.x you still need patches.
  • nicton
  • nicton
12 Jan 2025 10:01 - 12 Jan 2025 10:08
How do I configure the connection of two mesa 7i92 via ethernet? was created by nicton

How do I configure the connection of two mesa 7i92 via ethernet?

Category: General LinuxCNC Questions

Я сделал конфигурацию через pcconf, но linux cnc на нем не загружается. Если я загружаю конфигурацию с одной платой, то запускается linux cnc. Должен ли мой компьютер иметь два порта LAN для подключения двух плат?
  • alangibson
  • alangibson
12 Jan 2025 09:36
Replied by alangibson on topic RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime

RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime

Category: Installing LinuxCNC

 So is there a bug in the PREEMPT_RT support in the 6.12 kernel, or is it simply not implemented the way LinuxCNC has come to expect? Obviously LinuxCNC needs to support a working standard.


This conversation is a bit confusing because rodw and I are doing different things to get the same result.

I am starting with Raspberry Pi OS, switching to their 6.12 branch then building the kernel to enable PREEMPT_RT. I'm doing this because they don't have a kernel build of 6.12 with realtime enabled yet.

rodw is starring with plain Debian and using a build system to create an image for the Raspberry Pi.

Sidenote: all realtime code is merged in upstream 6.12 now, but you still have to enable it at build time with a configuration option. There's no way to turn realtime on and off after it's built. 
  • cmorley
  • cmorley
12 Jan 2025 09:35
Replied by cmorley on topic Qtdragon_hd wrong preview

Qtdragon_hd wrong preview

Category: Qtvcp

What version of linuxcnc are you using?
Can you post your config files?

How is the path displayed wrong?
  • vre
  • vre
12 Jan 2025 09:11
Qtdragon_hd wrong preview was created by vre

Qtdragon_hd wrong preview

Category: Qtvcp

I have setup a knee mill with qtdragon_hd within these limits in mm
X 0min 950max
Y -380min 0max
Z -400min 0max

But does not display in preview correct the path.
How can config this?
also does not show me in manual mode
spindle set rpm slide bar and spindle override rpm
 
  • spumco
  • spumco
12 Jan 2025 08:39
Replied by spumco on topic 4th axis build - Can I use Mitsubishi Servo Motor HF-SP102 (1kw) via SSCNET-III

4th axis build - Can I use Mitsubishi Servo Motor HF-SP102 (1kw) via SSCNET-III

Category: General LinuxCNC Questions


I assume you posted some info on your 4th axis build so I'll do some reading up on the homing.
 

I can't remember if I did or not, but the homing wound up being pretty convoluted because I was out of HS encoder inputs and had zero room to stuff another Mesa board in the enclosure.
  • Solution - use the drive's internal home-to-encoder-index function (Copley XSL)
  • I wound up using some relays and HAL logic so that when I pushed the "Home-A" button
    • LCNC sets home (i.e. G53 A0) without commanding the drive to do anything
    • joint.3.homing sends an output to trigger the A-drive to home itself
    • When the drive finishes homing, it sets an output that's connected to joint.3.home-sw-in
It works, and is like a low-tech version of the absolute homing the Ethercat folks use to 'trick' LCNC in to behaving with hardware capable of external homing.
  • hmnijp
  • hmnijp
12 Jan 2025 08:27 - 12 Jan 2025 08:31
Replied by hmnijp on topic Installing ethercat repositories

Installing ethercat repositories

Category: EtherCAT

If you are still having problems installing, I suggest you first uninstall all possible previously installed keys and repositories:
sudo rm -f /etc/apt/sources.list.d/ighvh.sources /etc/apt/sources.list.d/linuxcnc-ethercat.list /etc/apt/sources.list.d/science_EtherLab.list /etc/apt/trusted.gpg.d/linuxcnc-ethercat.gpg /etc/apt/trusted.gpg.d/science_EtherLab.gpg*


and then run the script from the first post.
wget -O ecat.sh https://forum.linuxcnc.org/media/kunena/attachments/20660/ecat.sh.txt
chmod +x ./ecat.sh
sudo ./ecat.sh

Or you can run the updated script, which will do this immediately. I've attached it.
wget -O ethercat-repos-update.sh https://forum.linuxcnc.org/media/kunena/attachments/34171/ethercat-repos-update.sh.txt
chmod +x ./ethercat-repos-update.sh
sudo ./ethercat-repos-update.sh
  • Aciera
  • Aciera's Avatar
12 Jan 2025 08:25
Replied by Aciera on topic G2

G2

Category: General LinuxCNC Questions

What have you set as your tool diameter and how much is 'too small'?
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
12 Jan 2025 04:53
Replied by Cant do this anymore bye all on topic Real-time kerel not detected on patched 6.12

Real-time kerel not detected on patched 6.12

Category: General LinuxCNC Questions

Like you assumed before I think those patches indeed didn't make it to the mainline kernel, but those are not needed to make a fully preemptible kernel.

The sysfs patch is only needed because LinuxCNC checks that indicator. Later I saw that the source of Raspberry also already has the arch_supports_rt in the kconfig.
 

Whilst it does have that it's not the correct value.....from the required patch I've used with 6.1.69
config ARCH_SUPPORTS_RT
-    bool
+    def_bool y
 
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