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Steppers stuttering

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4 years 5 months ago #243624 by tommylight
Replied by tommylight on topic Steppers stuttering
The official ISO uses the Preempt-RT kernel so it will have bad latency on older PC's, try installing the RTAI kernel :
linuxcnc.org/docs/2.8/html/getting-start...#cha:Installing-RTAI
Then use
uname -a
in a terminal to check what kernel is in use, if it is not the RTAI one, reboot and hold down the SHIFT key till you see ther GRUB menu, then choose the RTAI entry and press enter.

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4 years 5 months ago - 4 years 5 months ago #243629 by remon_v
Replied by remon_v on topic Steppers stuttering
If I can't fix it I will try the RTAI kernel, but I'm not sure how to do that yet. I can install it when I'm in Linux? Or should I download an ISO first?

At the moment the problem is 99% solved.

I put the reset time at 5000 and the dirhold and setup at 10000.
BTW lower is better right?
Last edit: 4 years 5 months ago by remon_v.

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4 years 5 months ago #243657 by tommylight
Replied by tommylight on topic Steppers stuttering
Just occurred to me, if you are using a cheap BOB with optocouplers, nothing under 100000 for base period will work correctly.
Also reset time of 8000 to 10000 is needed for those.
The following user(s) said Thank You: remon_v

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4 years 5 months ago #243675 by remon_v
Replied by remon_v on topic Steppers stuttering
Thanks Tommy, I've changed the rest time to 8000 and base period to 100.000

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4 years 5 months ago #243690 by tommylight
Replied by tommylight on topic Steppers stuttering
And?
Does it work smooth in Auto mode ?
Never rely on testing the machine while manual jogging, keyboards can and will introduce stuttering .

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4 years 5 months ago #243698 by remon_v
Replied by remon_v on topic Steppers stuttering
Hey Tommy,

I just ran another program… but I’m not satisfied yet. It still stutters. Maybe it’s not LinuxCNC’s fault, maybe it’s something with the wiring or so. I’m using GX16 connectors to connect to my control cabinet and it was about my first time soldering…

I don’t know….

On the cnczone forum someone said the auto tune on the drivers has only got to do with current. That helped yesterday, but today it seems worse from where I ended last night.

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