X-carve linux cnc upgrade tuning

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

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.

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

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

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.

mrbishop wrote: 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?

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:

mrbishop wrote: 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.

ok i'll have a look for it in abit.

trying not to be so lost in all of this.

andypugh wrote:

mrbishop wrote: 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.