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 > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7C%7Cdec28113c0d745ae7e5d08db954d6546%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638267931883275463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qTWdux60ZVNVGu500hGv5nTpLIMlYDdL3Zs26yr6p%2Bc%3D&reserved=0<https://lists.sourceforge.net/lists/listinfo/emc-users> > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7C%7Cdec28113c0d745ae7e5d08db954d6546%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638267931883275463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qTWdux60ZVNVGu500hGv5nTpLIMlYDdL3Zs26yr6p%2Bc%3D&reserved=0<https://lists.sourceforge.net/lists/listinfo/emc-users> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7C%7Cdec28113c0d745ae7e5d08db954d6546%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638267931883275463%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qTWdux60ZVNVGu500hGv5nTpLIMlYDdL3Zs26yr6p%2Bc%3D&reserved=0<https://lists.sourceforge.net/lists/listinfo/emc-users> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
