On 8/5/23 15:16, gene heskett wrote:
no, I didn't write this, someones email agent is broken when it
attributes this message to me.
On 8/5/23 14:45, Martin Dobbins wrote:
It makes me wonder which operating system they put on that Chinese
controller, and what motion control system.
Martin
________________________________
From: John Dammeyer
Sent: Friday, August 4, 2023 7:41 PM
To: 'Enhanced Machine Controller (EMC)' <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Beaglebone black latency
My biggest issue with the Xylotex BBB Cape for CNC was that the logic
for ESTOP was inverted. ESTOP was a N/O switch so if a wire was
broken you wouldn't find out until you tried to save a body part from
being injured with the ESTOP.
But back when a BBB was around $50 and a cape around $25 you had a 3
axis system. Obviously a break out board of some sort was needed but
that's true for MESA or any other type of interface just like motors
and switches are needed too.
The nice thing about these small systems with a small HDMI screen is
that they don't overwhelm the space taken by a small lathe like a 7x12
or Unimat DB200. I don't want a full size screen, mouse and keyboard
plus a PC clone for my DB-200 which looks a lot like this one.
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fi.redd.it%2F83lxxjam0yj71.jpg&data=05%7C01%7C%7Cdec28113c0d745ae7e5d08db954d6546%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638267931883275463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=l04m1ookT8TmrWx%2F8azPP2X2qqAyxgSJbezUEI7EZJM%3D&reserved=0<https://i.redd.it/83lxxjam0yj71.jpg>
For $100 Cdn free shipping I can get a Chinese Controller.
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.aliexpress.com%2Fitem%2F1005005195839565.html&data=05%7C01%7C%7Cdec28113c0d745ae7e5d08db954d6546%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638267931883275463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=O3eRaBFYdAVqxPxwCTL9JCUiFaYmhWTcGtwJKa%2BJFT4%3D&reserved=0<https://www.aliexpress.com/item/1005005195839565.html>
But I'd rather have a Linux based system or my ELS.
John
-----Original Message-----
From: Chris Albertson [mailto:albertson.ch...@gmail.com]
Sent: August 4, 2023 5:20 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Beaglebone black latency
I think the BBB was popular because of the twp PRUs. These are
programmable processors that are separate from the CPU. So you can get
very accurate real-time pulses out even with poor latency under Linux.
However, this does require programming the PRUs. Machinekit had a HAL
unit for the PRUs. I don�t know if LinuxCNC has this or not.
On Aug 4, 2023, at 11:18 AM, andy pugh <bodge...@gmail.com> wrote:
On Fri, 4 Aug 2023 at 01:48, alanmthomason--- via Emc-users
<emc-users@lists.sourceforge.net> wrote:
Hi There.I'm trying to work through setting up linuxcnc on a
beaglebone
black. I've run the latency-test, with results that are not looking
good.has anyone else run this test with a Beaglebone black? Is
there any
way to improve results.
I think that when Machinekit were fond of the Beaglebone they tended
to run it headless. I can't recall whether that was just poor graphics
performance in general, or whether it was due to latency issues.
You could try installing the (old) Machinekit image to see if the
latency with that kernel is better.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
� George Fitch, Atlanta Constitution Newspaper, 1912
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This one runs at 1/4 of the speed of a std linuxcnc install. I'd skip it
and its ilk. Not fast enough.
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Cheers, Gene Heskett.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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