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X-carve linux cnc upgrade tuning

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14 May 2016 06:22 #74639 by Rick G
You might start here...
forum.linuxcnc.org/forum/18-computer
The first few post should help a lot with latency.

And as posted above dramatically reduce your acceleration.

Rick G

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14 May 2016 21:55 #74658 by mrbishop
Replaced the nvidia you with an ati one and I'm under 50k max latency. Going to try to dedicate a core or 2 . Well I'm going to try anyway.

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15 May 2016 01:14 - 15 May 2016 01:19 #74669 by mrbishop
made some progress. played with isolating cores. switched back to my older pc (onboard GPU) which i built for my cnc but was getting over 200k latency. isolated a core and was around 13k..... added the parallel port PCI card in.... 200k

looks like the parallel port PCI card is my bottleneck.

can someone suggest a PCI or PCI express parallel port card? links?

pc picture tax

Last edit: 15 May 2016 01:19 by mrbishop.

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15 May 2016 04:41 - 15 May 2016 04:53 #74673 by Rick G
Take a look here...
forum.linuxcnc.org/forum/18-computer/189...-parallel-port-cards

You could also look at a Mesa 5i25...
mesaus.com/index.php?route=product/produ...ath=62&product_id=51

What version of linuxcnc are you using?
How did you install the parallel port card?

Have you tried reducing the acceleration yet?

Rick G
Last edit: 15 May 2016 04:53 by Rick G.

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15 May 2016 21:51 #74695 by mrbishop
movement acceleration wise is better now that i reduced my accel to 4. however at really slow speeds i moves with a pulse as in the videos. no smooth motion. move stop move stop move stop. so its not that its slow its that its pulsing.

version of linux cnc is that latest on the web site. i think it was the February release.
as for installing the card i just physically installed it in to the PCI slot on the motherboard.

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15 May 2016 22:11 #74697 by andypugh

movement acceleration wise is better now that i reduced my accel to 4. however at really slow speeds i moves with a pulse as in the videos..


Which videos?

If you put a halmeter on stepgen.N.counts, do the counts increase between pulses, or is it a pulse every time the count increments?

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15 May 2016 22:39 #74698 by mrbishop
i thought i posted them the other day earlier in the thread.

forgive my ignorance but is the halmeter part of the linux cnc software. :dry:

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15 May 2016 23:13 #74699 by andypugh

forgive my ignorance but is the halmeter part of the linux cnc software.


Yes. It allows you to watch the values of individual HAL pins (and signals and params).

In the Axis GUI it is available from the "Machine" menu. In other GUIs it might be in a menu, to it might not.

You can start it in any GUI from the command-line with "halcmd loadusr halmeter"

There is also Halscope that lets you plot pin values against time, (HAL - Osciloscope) which can be a useful tuning tool.

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15 May 2016 23:39 #74702 by mrbishop
ok i'll have a look for it in abit.

trying not to be so lost in all of this.

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15 May 2016 23:52 #74703 by mrbishop

movement acceleration wise is better now that i reduced my accel to 4. however at really slow speeds i moves with a pulse as in the videos..


Which videos?

If you put a halmeter on stepgen.N.counts, do the counts increase between pulses, or is it a pulse every time the count increments?


so the pulse is every time the count increments.

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