LinuxCNC software
22 Dec 2012 05:15 - 22 Dec 2012 05:53 #27933
by Candice
Replied by Candice on topic LinuxCNC software
man! this is where I could be experiencing the issues! maan, really!
here is the results to my latency test:
servo thread: max jitter: 44322
base thread: max jitter: 11513
is this good? what can I do to improve?
??? Do you have any suggestion on what DB25-DB25 M-F Cable I should get that works with Linux ???
here is the results to my latency test:
servo thread: max jitter: 44322
base thread: max jitter: 11513
is this good? what can I do to improve?
??? Do you have any suggestion on what DB25-DB25 M-F Cable I should get that works with Linux ???
Last edit: 22 Dec 2012 05:53 by Candice.
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22 Dec 2012 07:16 - 22 Dec 2012 07:16 #27936
by andypugh
You need a computer with a real, physical, parallel port.
You _also_ need a parallel cable with every wire included. Many only contain the bare minimum to drive a printer.
The good news is that you don't need an expensive computer, lots of almost-free computers are perfectly fine for LinuxCNC, or you can buy a $80 motherboard+CPU which will work very nicely.
Replied by andypugh on topic LinuxCNC software
It's not brilliant. It might work though.here is the results to my latency test:
servo thread: max jitter: 44322
base thread: max jitter: 11513
is this good? what can I do to improve?
Your cabling issue is much more of a limit. You can't use a USB to parallel convertor, all that they do is make the parallel printer look like a USB printer, and the computer can not individually drive the pins as it required for CNC control.Do you have any suggestion on what DB25-DB25 M-F Cable I should get that works with Linux
You need a computer with a real, physical, parallel port.
You _also_ need a parallel cable with every wire included. Many only contain the bare minimum to drive a printer.
The good news is that you don't need an expensive computer, lots of almost-free computers are perfectly fine for LinuxCNC, or you can buy a $80 motherboard+CPU which will work very nicely.
Last edit: 22 Dec 2012 07:16 by andypugh.
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22 Dec 2012 18:16 #27955
by Rick G
Replied by Rick G on topic LinuxCNC software
That latency is probably fine for now, after you get further along setting up you will know if it needs to be tweaked.
The big thing now is to have a real parallel port on your computer, not a usb to parallel port adapter.
I assume your computer does not hav a built in parallel port?
If so you need to use a computer that has one or add a parallel port card to your computer.
Do you have an empty slot on your computer for a card?
After you get a card to add a parallel port you will need a parallel port cable that has all the necessary wires connected at both ends.
You could also go with a MESA card instead of the parallel port.
If this computer has an empty slot I am sure we can suggest a card that will work with linuxcnc, there is probably a list of them on the WIKI.
Rick G
The big thing now is to have a real parallel port on your computer, not a usb to parallel port adapter.
I assume your computer does not hav a built in parallel port?
If so you need to use a computer that has one or add a parallel port card to your computer.
Do you have an empty slot on your computer for a card?
After you get a card to add a parallel port you will need a parallel port cable that has all the necessary wires connected at both ends.
You could also go with a MESA card instead of the parallel port.
If this computer has an empty slot I am sure we can suggest a card that will work with linuxcnc, there is probably a list of them on the WIKI.
Rick G
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