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Steppers stuttering

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14 Jul 2022 19:10 #247312 by JackRay
Replied by JackRay on topic Steppers stuttering

I have already modified my bios and reset the default settings several times.
I have tried everything concerning "Period Base", "Servo Period" nothing works.
about latency test, I have the warning also on my first PC which works very well, but I never managed to make the warning message disappear the moment LNC starts up.
On the other hand I never changed the RTAI kernel, so I have no idea how to do it.

I do my installations with the .ISO of debian 10 and I upgrade my LNC 2.8 version to 2.9 with buster.

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14 Jul 2022 22:00 #247325 by tommylight
Replied by tommylight on topic Steppers stuttering
To install RTAI kernel:
linuxcnc.org/docs/2.8/html/getting-start...#cha:Installing-RTAI
After reboot check with :
uname -a
If the kernel in use is the RTAI one, if not reboot, hold down the SHIFT button till you see the GRUB menu, there choose the kernel with RTAI in the name and press enter.
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15 Jul 2022 10:46 #247365 by JackRay
Replied by JackRay on topic Steppers stuttering
I installed the RTAI, but it is only in version 2.8 and I need version 2.9 for switchking. If I install version 2.9 the kernel is rtpreempt ... it does not work ...

Do you have a solution to install a version 2.9 with a RTAI kernel ?

Thanks

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15 Jul 2022 11:15 #247368 by tommylight
Replied by tommylight on topic Steppers stuttering
Nope.
See if you can find a Dell Optiplex 980, Midi tower case, used, it has a built in parallel port and works OK with RT kernel and 2.9.

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15 Jul 2022 13:59 #247383 by JackRay
Replied by JackRay on topic Steppers stuttering
Indeed my PC is very stable with the RTAI kernel : test latency : 8500 jitts .
Before buying a new PC, I can also use version 2.8 since it takes into account the xyzac-trt configuration. 
But how does it work when I want to switch from TCP (M429) 5 continuous axes to (M430) 5 independent axes ?
Is it necessary to make several programs? Is it necessary to have two configurations?

Thanks

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16 Jul 2022 20:09 #247497 by andypugh
Replied by andypugh on topic Steppers stuttering

Do you have a solution to install a version 2.9 with a RTAI kernel ?
 

Are you willing to compile it yourself? 

Unfortunately the buildbot is not building RTAI packages at the moment as the available RTAI kernel sometimes crashes on exit, and that means that the buildbot crashed when running the regression tests. 

It's possible that I have a 2.9 deb somewhere. 
 

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17 Jul 2022 05:57 #247542 by JackRay
Replied by JackRay on topic Steppers stuttering
Hello , Thanks , tommylight found me a 2.9 version under linux mint 21 that works great on my PC with a relatively stable rtpreempt kernel .
My PC was not working at all with Debian and kernel 4.19 ... .

I invite everyone to switch to this version, in addition Linux mint is much more flexible and more modern than Debian 10.

The Mint 21 version is a beta version, but for having tested it in all the directions, I did not succeed in crashing it.

Thanks again to all the team for your help and assistance

 
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