Re: [Emc-users] Question about Raspberry Pi 4 reliability

[John Dammeyer]

So it happened again this afternoon on the Pi4 1GB.  Wifi is active as is 
Ethernet to the 7i92H.

"Unexpected realtime delay on task 0 with period 100
This Message will only display once per session.
Run the Latency Test and resolve before continuing."So just moving windows 
around and transferring files over WiFi runs the Pi4 with about 125111 ns on 
the Servo thread (1ms)

But, play a full screen HDMI 1080P quicktime movie and then start resizing the 
screen vertically and horizontally and it can easily jump up to 775689 ns 
jitter.

I think the video is extreme but there it is.

What parameter should be tweaked in the hal or ini file to at least tell it 
about the 125111?

Thanks
John




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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[John Dammeyer]

> From: andy pugh [mailto:bodge...@gmail.com]
> On Sun, 13 Jun 2021 at 09:52, John Dammeyer  wrote:
> 
> > I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it 
> > has issues with that much memory on the Pi.  It works best
> with 4GB apparently.
> 
> Well, the existing preemp-rt kernel when I built the 2.8 release
> packages was 32-bit, so can not address 8GB.
> And there was a problem with that kernel if the available memory was
> set to more than 3GB.
> 
> But, since then, I think that both issues have been fixed. There is a
> forum thread on building a 64-bit Pi LinuxCNC setup (and, I think,
> that there is probably  a link somewhere to download an SD card
> image).
> But I haven't really had the time or motivation to follow it in detail
> 

I don't think I'll move to the front of the bus for this.  Not sure how an 
extra 4GB can make LinuxCNC run any better but I think it's good that it 
doesn't choke if it happens to be loaded into an 8GB machine.
John




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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[andy pugh]

On Sun, 13 Jun 2021 at 09:52, John Dammeyer  wrote:

> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it has 
> issues with that much memory on the Pi.  It works best with 4GB apparently.

Well, the existing preemp-rt kernel when I built the 2.8 release
packages was 32-bit, so can not address 8GB.
And there was a problem with that kernel if the available memory was
set to more than 3GB.

But, since then, I think that both issues have been fixed. There is a
forum thread on building a 64-bit Pi LinuxCNC setup (and, I think,
that there is probably  a link somewhere to download an SD card
image).
But I haven't really had the time or motivation to follow it in detail

-- 
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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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Bari]

On 6/13/21 9:18 PM, Leonardo Marsaglia wrote:


Wow, that escalated quickly! LOL.
Nah, we just get trolls on the list from time to time. They don't have 
any solutions, just random complaints and half baked ideas.


Well, I've been reading everyone and I guess I'll stay with the normal PC
architecture for now. I'm not doubting about the capabilities of the Rpi
but really don't have that much time to play around with it.


If you supply enough power and keep the Rpi's cool they work well 
enough. But yeah you might have a to spend a bit of money and time on 
the right power supply, enclosure, heat sink and settings to have a nice 
stable system.



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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Leonardo Marsaglia]

Wow, that escalated quickly! LOL.

Well, I've been reading everyone and I guess I'll stay with the normal PC
architecture for now. I'm not doubting about the capabilities of the Rpi
but really don't have that much time to play around with it.


El dom, 13 jun 2021 a las 20:45, Bari () escribió:

> On 6/13/21 2:49 PM, Feral Engineer wrote:
>
> > Anyone trying to push a grbl box over Linuxcnc clearly has their head in
> a
> > rather unmentionable place.
> >
> > As someone who has worked in the machine tool industry for nearly 2
> > decades, I've found Linuxcnc to be comparable to many "industrial" grade
> > controls, like fanuc, mitsubishi meldas and siemens from both
> configuration
> > and operation standpoint.
> >
> > No CNC control is perfect, but the countless hours the developers have
> put
> > into lcnc out of their sheer dedication to the product shouldn't be
> written
> > off and for a feature that isn't yet implemented, the openness of the
> > software allows you to choose your own destiny with how you want it to
> look
> > and operate.
> >
> > Show me grbl support for PLC/ladder, show me grbl support for 5 axis
> > kinematics or ATC circuits, show me grbl support for any code that
> ventures
> > away from G0 and G1.
> >
> >
> The only issue I've had with the Rpi4 with 2Gb or 4GB of RAM has been
> with stable 4K video using the LCNC Buster ISO or Raspian. It might be a
> lucky combo of cables and monitors that cause the video to lose sync
> every now and then. But when I try to use it with a 4K projector for DLP
> resin printing the loss of signal for even a second triggers the
> firmware in the projector to display text on the projector that signal
> was lost and then display the projector brand, which in turn ruins the
> print since the display is the tool.
>
> The problem went away when I used a Gentoo image for the Rpi4
> https://github.com/sakaki-/gentoo-on-rpi-64bit
>
> I didn't compare all the differences between the drivers and configs for
> Gentoo vs Buster and Raspian to see what the Gentoo dev was getting
> right. It might have even been its firmware settings.
>
>
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Bari]

On 6/13/21 2:49 PM, Feral Engineer wrote:


Anyone trying to push a grbl box over Linuxcnc clearly has their head in a
rather unmentionable place.

As someone who has worked in the machine tool industry for nearly 2
decades, I've found Linuxcnc to be comparable to many "industrial" grade
controls, like fanuc, mitsubishi meldas and siemens from both configuration
and operation standpoint.

No CNC control is perfect, but the countless hours the developers have put
into lcnc out of their sheer dedication to the product shouldn't be written
off and for a feature that isn't yet implemented, the openness of the
software allows you to choose your own destiny with how you want it to look
and operate.

Show me grbl support for PLC/ladder, show me grbl support for 5 axis
kinematics or ATC circuits, show me grbl support for any code that ventures
away from G0 and G1.


The only issue I've had with the Rpi4 with 2Gb or 4GB of RAM has been 
with stable 4K video using the LCNC Buster ISO or Raspian. It might be a 
lucky combo of cables and monitors that cause the video to lose sync 
every now and then. But when I try to use it with a 4K projector for DLP 
resin printing the loss of signal for even a second triggers the 
firmware in the projector to display text on the projector that signal 
was lost and then display the projector brand, which in turn ruins the 
print since the display is the tool.


The problem went away when I used a Gentoo image for the Rpi4 
https://github.com/sakaki-/gentoo-on-rpi-64bit


I didn't compare all the differences between the drivers and configs for 
Gentoo vs Buster and Raspian to see what the Gentoo dev was getting 
right. It might have even been its firmware settings.




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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Feral Engineer]

Anyone trying to push a grbl box over Linuxcnc clearly has their head in a
rather unmentionable place.

As someone who has worked in the machine tool industry for nearly 2
decades, I've found Linuxcnc to be comparable to many "industrial" grade
controls, like fanuc, mitsubishi meldas and siemens from both configuration
and operation standpoint.

No CNC control is perfect, but the countless hours the developers have put
into lcnc out of their sheer dedication to the product shouldn't be written
off and for a feature that isn't yet implemented, the openness of the
software allows you to choose your own destiny with how you want it to look
and operate.

Show me grbl support for PLC/ladder, show me grbl support for 5 axis
kinematics or ATC circuits, show me grbl support for any code that ventures
away from G0 and G1.

Coming on here, bashing Linuxcnc (and indirectly, the developers and users)
while simultaneously trying to sell your own product is breaking a cardinal
rule in good sales tactics. You should never belittle a competitor product
to make yours look better, you should provide information about your
product that shows key points on how it's better.


Phil T.
The Feral Engineer

Check out my LinuxCNC tutorials, machine builds and other antics at
www.youtube.com/c/theferalengineer

Help support my channel efforts and coffee addiction:
www.patreon.com/theferalengineer

On Sun, Jun 13, 2021, 1:54 PM Gene Heskett  wrote:

> On Sunday 13 June 2021 12:24:12 Rafael Skodlar wrote:
>
> > On 6/13/21 1:49 AM, John Dammeyer wrote:
> > >> From: Andy Pugh [mailto:bodge...@gmail.com]
> > >>
> > >>> On 13 Jun 2021, at 00:28, Leonardo Marsaglia
> > >>>  wrote:
> > >>>
> > >>>   I do have a Rpi3
> > >>
> > >> ...
> > >>
> > >>> I don't know if that's a good candidate to test LCNC.
> > >>
> > >> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4
> > >> Pis have the Ethernet in the USB bus.
> > >
> > > I've also read that the Pi4 8GB is not ideal for LinuxCNC.
> > > Apparently it has issues with that much memory on the Pi.  It works
> > > best with 4GB apparently.
> > >
> > > John
> >
> > Huh? That makes no sense. If nothing else, you can use it for fake
> > swap if nothing else.
> >
> > RPi is NOT good for any industrial use.
>
> Scuse me while I get upset at a pack of lies promulgated by Rafael
> Skodlar.
>
> Tell that to my 75 yo Sheldon lathe, which is now being driven by a pi4b,
> but which also worked well with the previous pi3b for a couple years,
> and its doing stuff with only 2 motors, and NO compound and no taper kit
> that it couldn't with an intact compound and a taper kit when it was
> new, and doing it faster than any human could have done it 75 years
> ago. 'Merican threads of any pitch and taper, ditto for Metric threads
> of any pitch and taper. Correcting for bed wear dynamically as it moves.
> Measuring (and correcting for it if you write it into the gcode, so no
> more broken taps from hitting the bottom of a hole) overshoot at the
> turn around (spindle reverse) point while its doing rigid tapping.  And
> it does all this with months of uptime if I shut down the daily updates
> since its is also building LinuxCNC from github/master, on the pi, for
> the pi, installed on the pi at least daily.
>
> > This thing is for kids to
> > learn Linux and open source programming techniques. RaspberryPi PCB
> > design is just bad for industrial use: holes for mounting, using glue
> > for CPU heatsink, connectors positions and their orientation, sandwich
> > style header connector for DIO, silicon waste (for sound and video
> > IO), etc.
> >
> > To execute G-code using a large footprint computer makes no sense
> > anymore. This open source based solution is gaining popularity for
> > simple CNC:
> > https://openbuildspartstore.com/interface/  and other related HW.
> >
> So thats why the derogatory post. You want to sell your little box.
> I don't have a problem with that, beauty always being in the mind of the
> beholder. NIH syndrome at its best.
>
> But you have no excuse to lie and denegrate the pi's while doing it.
>
> > Just the fact that Openbuilds is not using LinuxCNC is saying
> > something. Dead end: no innovations, limitation in
> > electronics/hardware selection.
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Joshua Berensen]

Lol openbuilds is using grbl because it’s simple. Openbuilds doesn’t specialize 
with larger and more complex machines along with more sophisticated control 
systems and user interfaces. Grbl is great for simple router machines and 
openbuild’s “MiniMill”. It’s a toy for larger and more complex machines. Even 
Tormach uses their own fork of LinuxCNC. Grbl just can’t get the job done. 


> On Jun 13, 2021, at 11:41 AM, Ralph Stirling  
> wrote:
> 
> Don't want to fuel any flame wars, but this kind of solution is probably 
> fine for generic desktop cnc routers with steppers. Grbl even has jerk 
> limited trajectories.  As soon as you get out of that stock 3 or 4 axis space 
> and want to have tool changers, servos, non-cartesian machines, lathes, 
> custom logic and the like, Linuxcnc really shines.  For the lower end 
> machines this package is aimed at, a Rpi 4B with Mesa 7i90 and Linuxcnc 2.8 
> works great and is price competitive.
> 
> -- Ralph
> 
> On Jun 13, 2021 9:51 AM, Rafael Skodlar  wrote:
> CAUTION: This email originated from outside the Walla Walla University email 
> system.
> 
> 
> On 6/13/21 1:49 AM, John Dammeyer wrote:
>>> From: Andy Pugh [mailto:bodge...@gmail.com]
> On 13 Jun 2021, at 00:28, Leonardo Marsaglia  
> wrote:
> 
>  I do have a Rpi3
>>> ...
 I don't know if that's a good candidate to test LCNC.
>>> 
>>> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have 
>>> the Ethernet in the USB bus.
>> 
>> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it 
>> has issues with that much memory on the Pi.  It works best with 4GB 
>> apparently.
>> 
>> John
> 
> Huh? That makes no sense. If nothing else, you can use it for fake swap
> if nothing else.
> 
> RPi is NOT good for any industrial use. This thing is for kids to learn
> Linux and open source programming techniques. RaspberryPi PCB design is
> just bad for industrial use: holes for mounting, using glue for CPU
> heatsink, connectors positions and their orientation, sandwich style
> header connector for DIO, silicon waste (for sound and video IO), etc.
> 
> To execute G-code using a large footprint computer makes no sense
> anymore. This open source based solution is gaining popularity for
> simple CNC:
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fopenbuildspartstore.com%2Finterface%2Fdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9377f0f2a33846d8a41108d92e8b7bf1%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637591998889297483%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000sdata=jqHDAlBt4VCbphwggl1aVHGR%2F5thbXWVtXbdSs3AF%2F0%3Dreserved=0
>   and other related HW.
> 
> Just the fact that Openbuilds is not using LinuxCNC is saying something.
> Dead end: no innovations, limitation in electronics/hardware selection.
> 
> 
> --
> Rafael Skodlar
> 
> 
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Ralph Stirling]

Good point.  The OpenBuilds motion controller is another $200.
That pendant Rafael linked could probably be easily interfaced
to Linuxcnc instead of the OpenBuilds motion controller if one
wanted.

The OpenBuilds motion controller  is in a nice little box with
pluggable screw terminals on the side.  I would like to see a
Linuxcnc motion controller package that is more like a typical
PLC package, with pluggable 24v compatible I/O and everything
boxed up and powered.  Might have to design it myself and see
who else is interested in it.

https://openbuildspartstore.com/blackbox-motion-control-system/

-- Ralph

From: Dr. Andreas O. Lindner [a.lind...@lindner-tac.at]
Sent: Sunday, June 13, 2021 10:05 AM
To: ra...@linwin.com; Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Question about Raspberry Pi 4 reliability

CAUTION: This email originated from outside the Walla Walla University email 
system.


Sorry to say, but here you missed something. A motion-controller is needed in 
addition. They mention something like grbl 1.1, ….

LCNC is all that together and can do a lot more. This seams to be some fancy 
pendent for grbl.

just my 2 cts.

Andreas O. Lindner

Lindner TAC


> Am 13.06.2021 um 18:24 schrieb Rafael Skodlar :
>
> On 6/13/21 1:49 AM, John Dammeyer wrote:
>>> From: Andy Pugh [mailto:bodge...@gmail.com]
>>>> On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:
>>>>
>>>>  I do have a Rpi3
>>> ...
>>>> I don't know if that's a good candidate to test LCNC.
>>>
>>> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have 
>>> the Ethernet in the USB bus.
>> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it 
>> has issues with that much memory on the Pi.  It works best with 4GB 
>> apparently.
>> John
>
> Huh? That makes no sense. If nothing else, you can use it for fake swap if 
> nothing else.
>
> RPi is NOT good for any industrial use. This thing is for kids to learn Linux 
> and open source programming techniques. RaspberryPi PCB design is just bad 
> for industrial use: holes for mounting, using glue for CPU heatsink, 
> connectors positions and their orientation, sandwich style header connector 
> for DIO, silicon waste (for sound and video IO), etc.
>
> To execute G-code using a large footprint computer makes no sense anymore. 
> This open source based solution is gaining popularity for simple CNC:
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fopenbuildspartstore.com%2Finterface%2Fdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C7ce4fb1e23484f391e4308d92e8fd5a7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637592017581330281%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000sdata=4Rc36AB7NWMvZcMu8igGs6%2BfttO%2FFGyesYO3OI9ZXFM%3Dreserved=0
>   and other related HW.
>
> Just the fact that Openbuilds is not using LinuxCNC is saying something. Dead 
> end: no innovations, limitation in electronics/hardware selection.
>
>
> --
> Rafael Skodlar
>
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Gene Heskett]

On Sunday 13 June 2021 12:24:12 Rafael Skodlar wrote:

> On 6/13/21 1:49 AM, John Dammeyer wrote:
> >> From: Andy Pugh [mailto:bodge...@gmail.com]
> >>
> >>> On 13 Jun 2021, at 00:28, Leonardo Marsaglia
> >>>  wrote:
> >>>
> >>>   I do have a Rpi3
> >>
> >> ...
> >>
> >>> I don't know if that's a good candidate to test LCNC.
> >>
> >> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4
> >> Pis have the Ethernet in the USB bus.
> >
> > I've also read that the Pi4 8GB is not ideal for LinuxCNC. 
> > Apparently it has issues with that much memory on the Pi.  It works
> > best with 4GB apparently.
> >
> > John
>
> Huh? That makes no sense. If nothing else, you can use it for fake
> swap if nothing else.
>
> RPi is NOT good for any industrial use.

Scuse me while I get upset at a pack of lies promulgated by Rafael 
Skodlar.

Tell that to my 75 yo Sheldon lathe, which is now being driven by a pi4b, 
but which also worked well with the previous pi3b for a couple years, 
and its doing stuff with only 2 motors, and NO compound and no taper kit 
that it couldn't with an intact compound and a taper kit when it was 
new, and doing it faster than any human could have done it 75 years 
ago. 'Merican threads of any pitch and taper, ditto for Metric threads 
of any pitch and taper. Correcting for bed wear dynamically as it moves. 
Measuring (and correcting for it if you write it into the gcode, so no 
more broken taps from hitting the bottom of a hole) overshoot at the 
turn around (spindle reverse) point while its doing rigid tapping.  And 
it does all this with months of uptime if I shut down the daily updates 
since its is also building LinuxCNC from github/master, on the pi, for 
the pi, installed on the pi at least daily.

> This thing is for kids to 
> learn Linux and open source programming techniques. RaspberryPi PCB
> design is just bad for industrial use: holes for mounting, using glue
> for CPU heatsink, connectors positions and their orientation, sandwich
> style header connector for DIO, silicon waste (for sound and video
> IO), etc.
>
> To execute G-code using a large footprint computer makes no sense
> anymore. This open source based solution is gaining popularity for
> simple CNC:
> https://openbuildspartstore.com/interface/  and other related HW.
>
So thats why the derogatory post. You want to sell your little box.
I don't have a problem with that, beauty always being in the mind of the 
beholder. NIH syndrome at its best.

But you have no excuse to lie and denegrate the pi's while doing it.

> Just the fact that Openbuilds is not using LinuxCNC is saying
> something. Dead end: no innovations, limitation in
> electronics/hardware selection.

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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Ralph Stirling]

Don't want to fuel any flame wars, but this kind of solution is probably fine 
for generic desktop cnc routers with steppers. Grbl even has jerk limited 
trajectories.  As soon as you get out of that stock 3 or 4 axis space and want 
to have tool changers, servos, non-cartesian machines, lathes, custom logic and 
the like, Linuxcnc really shines.  For the lower end machines this package is 
aimed at, a Rpi 4B with Mesa 7i90 and Linuxcnc 2.8 works great and is price 
competitive.

-- Ralph

On Jun 13, 2021 9:51 AM, Rafael Skodlar  wrote:
CAUTION: This email originated from outside the Walla Walla University email 
system.


On 6/13/21 1:49 AM, John Dammeyer wrote:
>> From: Andy Pugh [mailto:bodge...@gmail.com]
>>> On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:
>>>
>>>   I do have a Rpi3
>> ...
>>> I don't know if that's a good candidate to test LCNC.
>>
>> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have 
>> the Ethernet in the USB bus.
>
> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it has 
> issues with that much memory on the Pi.  It works best with 4GB apparently.
>
> John

Huh? That makes no sense. If nothing else, you can use it for fake swap
if nothing else.

RPi is NOT good for any industrial use. This thing is for kids to learn
Linux and open source programming techniques. RaspberryPi PCB design is
just bad for industrial use: holes for mounting, using glue for CPU
heatsink, connectors positions and their orientation, sandwich style
header connector for DIO, silicon waste (for sound and video IO), etc.

To execute G-code using a large footprint computer makes no sense
anymore. This open source based solution is gaining popularity for
simple CNC:
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fopenbuildspartstore.com%2Finterface%2Fdata=04%7C01%7Cralph.stirling%40wallawalla.edu%7C9377f0f2a33846d8a41108d92e8b7bf1%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C1%7C637591998889297483%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000sdata=jqHDAlBt4VCbphwggl1aVHGR%2F5thbXWVtXbdSs3AF%2F0%3Dreserved=0
  and other related HW.

Just the fact that Openbuilds is not using LinuxCNC is saying something.
Dead end: no innovations, limitation in electronics/hardware selection.


--
Rafael Skodlar


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Dr. Andreas O. Lindner]

Sorry to say, but here you missed something. A motion-controller is needed in 
addition. They mention something like grbl 1.1, ….

LCNC is all that together and can do a lot more. This seams to be some fancy 
pendent for grbl.

just my 2 cts.

Andreas O. Lindner

Lindner TAC


> Am 13.06.2021 um 18:24 schrieb Rafael Skodlar :
> 
> On 6/13/21 1:49 AM, John Dammeyer wrote:
>>> From: Andy Pugh [mailto:bodge...@gmail.com]
 On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:
 
  I do have a Rpi3
>>> ...
 I don't know if that's a good candidate to test LCNC.
>>> 
>>> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have 
>>> the Ethernet in the USB bus.
>> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it 
>> has issues with that much memory on the Pi.  It works best with 4GB 
>> apparently.
>> John
> 
> Huh? That makes no sense. If nothing else, you can use it for fake swap if 
> nothing else.
> 
> RPi is NOT good for any industrial use. This thing is for kids to learn Linux 
> and open source programming techniques. RaspberryPi PCB design is just bad 
> for industrial use: holes for mounting, using glue for CPU heatsink, 
> connectors positions and their orientation, sandwich style header connector 
> for DIO, silicon waste (for sound and video IO), etc.
> 
> To execute G-code using a large footprint computer makes no sense anymore. 
> This open source based solution is gaining popularity for simple CNC:
> https://openbuildspartstore.com/interface/  and other related HW.
> 
> Just the fact that Openbuilds is not using LinuxCNC is saying something. Dead 
> end: no innovations, limitation in electronics/hardware selection.
> 
> 
> -- 
> Rafael Skodlar
> 
> 
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Dr. Nikolaus Klepp]

Anno domini 2021 Sun, 13 Jun 09:24:12 -0700
 Rafael Skodlar scripsit:
> On 6/13/21 1:49 AM, John Dammeyer wrote:
> >> From: Andy Pugh [mailto:bodge...@gmail.com]
> >>> On 13 Jun 2021, at 00:28, Leonardo Marsaglia  
> >>> wrote:
> >>>
> >>>   I do have a Rpi3
> >> ...
> >>> I don't know if that's a good candidate to test LCNC.
> >>
> >> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have 
> >> the Ethernet in the USB bus.
> > 
> > I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it 
> > has issues with that much memory on the Pi.  It works best with 4GB 
> > apparently.
> > 
> > John
> 
> Huh? That makes no sense. If nothing else, you can use it for fake swap 
> if nothing else.
> 
> RPi is NOT good for any industrial use. This thing is for kids to learn 
> Linux and open source programming techniques. RaspberryPi PCB design is 
> just bad for industrial use: holes for mounting, using glue for CPU 
> heatsink, connectors positions and their orientation, sandwich style 
> header connector for DIO, silicon waste (for sound and video IO), etc.
> 
> To execute G-code using a large footprint computer makes no sense 
> anymore. This open source based solution is gaining popularity for 
> simple CNC:
> https://openbuildspartstore.com/interface/  and other related HW.

Don't know if GRBL + SBC is better than RPi+GRBL - it's just costs more.


> 
> Just the fact that Openbuilds is not using LinuxCNC is saying something. 
> Dead end: no innovations, limitation in electronics/hardware selection.
> 
> 



-- 
Please do not email me anything that you are not comfortable also sharing with 
the NSA, CIA ...


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Rafael Skodlar]

On 6/13/21 1:49 AM, John Dammeyer wrote:

From: Andy Pugh [mailto:bodge...@gmail.com]

On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:

  I do have a Rpi3

...

I don't know if that's a good candidate to test LCNC.


I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have the 
Ethernet in the USB bus.


I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it has 
issues with that much memory on the Pi.  It works best with 4GB apparently.

John


Huh? That makes no sense. If nothing else, you can use it for fake swap 
if nothing else.


RPi is NOT good for any industrial use. This thing is for kids to learn 
Linux and open source programming techniques. RaspberryPi PCB design is 
just bad for industrial use: holes for mounting, using glue for CPU 
heatsink, connectors positions and their orientation, sandwich style 
header connector for DIO, silicon waste (for sound and video IO), etc.


To execute G-code using a large footprint computer makes no sense 
anymore. This open source based solution is gaining popularity for 
simple CNC:

https://openbuildspartstore.com/interface/  and other related HW.

Just the fact that Openbuilds is not using LinuxCNC is saying something. 
Dead end: no innovations, limitation in electronics/hardware selection.



--
Rafael Skodlar


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Chris Albertson]

My point was you could free up the Raspberry  Pi, you don't need it if the
printer is within a cable length of anything that already runs LinuxCNC.
Then you are a "free" Pi to experiment with

On Sat, Jun 12, 2021 at 5:39 PM Leonardo Marsaglia 
wrote:

> Well, the portability is not a must, but the idea of having all the major
> hardware as compact as possible really tempts me to at least consider the
> idea. For the other machines I used mini ATX with one PCI express port to
> accommodate the Mesa board. For this project I'm inclined to use an
> Ethernet card just to simplify the hardware mounting on the cabinet. And
> since the Rpi 4 is growing in popularity here, I just needed to ask to see
> if it's worth the try.
>
> With octoprint the Rpi 3 is working flawlessly really, although that
> doesn't have to do what LCNC has to do, and also I'm not even using the
> GUI.
>
> El sáb, 12 jun 2021 a las 20:58, Chris Albertson (<
> albertson.ch...@gmail.com>)
> escribió:
>
> > Why does the control computer need to be portable, unless you are
> building
> > a portable router and want the whole machine to be easy to move?
> >
> > As for Octoprint, I use a standard PC (an older i5 with about 8 GB RAM.)
> f
> >  In fact, the very same PC runs both LinuxCNC and Octoprint at the same
> > time just fine without coming close to using all the available CPU.  RT
> > Linux makes sure the bits of EMC that need to run in the real-time run in
> > real-time   Even with streaming video and a remote log-in, the PC is not
> > half loaded and neither is the gigabit Ethernet.  PCs are so much more
> > powerful then RPI.
> >
> > I use the Pi4 for mobile robots that need to run on battery power but I
> > don't see the point with AC mains power is available.
> >
> > On Sat, Jun 12, 2021 at 4:28 PM Leonardo Marsaglia <
> ldmarsag...@gmail.com>
> > wrote:
> >
> > > Hello guys,
> > >
> > > As  some of you know, I'm finishing a CNC router and I'm about to
> > purchase
> > > all the control hardware. I know Gene, John, and several people here
> are
> > > running LCNC on the PI with success but I would like to know how much
> of
> > a
> > > pain in the ass is to get it running well with a 7i76E for controlling
> > the
> > > router.
> > >
> > > I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as
> > I've
> > > been doing with all the other machines. I really like the idea of using
> > > something as portable and small as the Rpi but I don't want to purchase
> > one
> > > just to test right now... I do have a Rpi3 with Octoprint on the ender
> > but
> > > I don't know if that's a good candidate to test LCNC.
> > >
> > > What do you guys think?
> > >
> > > Thanks as always and I hope you're all doing well :)
> > >
> > > ___
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >
> >
> >
> > --
> >
> > Chris Albertson
> > Redondo Beach, California
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> ___
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Ralph Stirling]

It does take a bit more fiddling to get everything going on the Rpi 4B, but it 
seems to run pretty nicely once done.  I don't have experience using it with a 
7i76e, as most of us use it with the $45 7i90.  If you don't need hardwired 
ethernet for communication with the 4B, then you can certainly use it for any 
Mesa ethernet card like the 7i92 or the 7i76e (if I'm remembering what a 7i76e 
is).

-- Ralph

On Jun 12, 2021 4:25 PM, Leonardo Marsaglia  wrote:
CAUTION: This email originated from outside the Walla Walla University email 
system.


Hello guys,

As  some of you know, I'm finishing a CNC router and I'm about to purchase
all the control hardware. I know Gene, John, and several people here are
running LCNC on the PI with success but I would like to know how much of a
pain in the ass is to get it running well with a 7i76E for controlling the
router.

I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
been doing with all the other machines. I really like the idea of using
something as portable and small as the Rpi but I don't want to purchase one
just to test right now... I do have a Rpi3 with Octoprint on the ender but
I don't know if that's a good candidate to test LCNC.

What do you guys think?

Thanks as always and I hope you're all doing well :)

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Feral Engineer]

I'm running a 4gb pi4b on my Emco lathe with minimal issue. My pulses per
unit are really high because of the screw pitch and belt reduction from the
emco factory, but it still seems to get along nicely with the rest of the
machine.

Phil T.
The Feral Engineer

Check out my LinuxCNC tutorials, machine builds and other antics at
www.youtube.com/c/theferalengineer

Help support my channel efforts and coffee addiction:
www.patreon.com/theferalengineer

On Sun, Jun 13, 2021, 9:29 AM Sam Sokolik  wrote:

> I have been happy with it.
> Not been using the PI for production - mostly just tinkering.Doing some
> pretty complicated configs.
>
> I have had it up for many days at a time with no issues...  Running
> programs that run hours...
>
> sam
>
>
> On Sun, Jun 13, 2021 at 4:37 AM Gene Heskett  wrote:
>
> > On Sunday 13 June 2021 04:49:19 John Dammeyer wrote:
> >
> > > > From: Andy Pugh [mailto:bodge...@gmail.com]
> > > >
> > > > > On 13 Jun 2021, at 00:28, Leonardo Marsaglia
> > > > >  wrote:
> > > > >
> > > > >  I do have a Rpi3
> > > >
> > > > ...
> > > >
> > > > > I don't know if that's a good candidate to test LCNC.
> > > >
> > > > I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis
> > > > have the Ethernet in the USB bus.
> > >
> > > I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently
> > > it has issues with that much memory on the Pi.  It works best with 4GB
> > > apparently.
> > >
> > > John
> > >
> > My 2 Gig rpi4 is perhaps a bit crowded. ATM its showing an uptime of
> > 18.75 days, and is 160 megs into swap. Swap itself is a 10G partition on
> > a 120G SSD, separate from the 240 G work drive so that is working at
> > USB3 speeds. I don't consider 160 megs to be a problem child unless it
> > impacts the uptime, which at times has been several months as its on a
> > small ups and I have automatic backup power that limits downtime to
> > about 10 seconds even if the neighborhood is dark for hours. Recall that
> > this pi is building and installing master or master-gtk3 many times a
> > week. That is working harder than running LCNC.
> > >
> > >
> > >
> > > ___
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
> >
> > 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)
> > If we desire respect for the law, we must first make the law respectable.
> >  - Louis D. Brandeis
> > Genes Web page 
> >
> >
> > ___
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> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Sam Sokolik]

I have been happy with it.
Not been using the PI for production - mostly just tinkering.Doing some
pretty complicated configs.

I have had it up for many days at a time with no issues...  Running
programs that run hours...

sam


On Sun, Jun 13, 2021 at 4:37 AM Gene Heskett  wrote:

> On Sunday 13 June 2021 04:49:19 John Dammeyer wrote:
>
> > > From: Andy Pugh [mailto:bodge...@gmail.com]
> > >
> > > > On 13 Jun 2021, at 00:28, Leonardo Marsaglia
> > > >  wrote:
> > > >
> > > >  I do have a Rpi3
> > >
> > > ...
> > >
> > > > I don't know if that's a good candidate to test LCNC.
> > >
> > > I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis
> > > have the Ethernet in the USB bus.
> >
> > I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently
> > it has issues with that much memory on the Pi.  It works best with 4GB
> > apparently.
> >
> > John
> >
> My 2 Gig rpi4 is perhaps a bit crowded. ATM its showing an uptime of
> 18.75 days, and is 160 megs into swap. Swap itself is a 10G partition on
> a 120G SSD, separate from the 240 G work drive so that is working at
> USB3 speeds. I don't consider 160 megs to be a problem child unless it
> impacts the uptime, which at times has been several months as its on a
> small ups and I have automatic backup power that limits downtime to
> about 10 seconds even if the neighborhood is dark for hours. Recall that
> this pi is building and installing master or master-gtk3 many times a
> week. That is working harder than running LCNC.
> >
> >
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
> 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)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
>
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Gene Heskett]

On Sunday 13 June 2021 04:49:19 John Dammeyer wrote:

> > From: Andy Pugh [mailto:bodge...@gmail.com]
> >
> > > On 13 Jun 2021, at 00:28, Leonardo Marsaglia
> > >  wrote:
> > >
> > >  I do have a Rpi3
> >
> > ...
> >
> > > I don't know if that's a good candidate to test LCNC.
> >
> > I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis
> > have the Ethernet in the USB bus.
>
> I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently
> it has issues with that much memory on the Pi.  It works best with 4GB
> apparently.
>
> John
>
My 2 Gig rpi4 is perhaps a bit crowded. ATM its showing an uptime of 
18.75 days, and is 160 megs into swap. Swap itself is a 10G partition on 
a 120G SSD, separate from the 240 G work drive so that is working at 
USB3 speeds. I don't consider 160 megs to be a problem child unless it 
impacts the uptime, which at times has been several months as its on a 
small ups and I have automatic backup power that limits downtime to 
about 10 seconds even if the neighborhood is dark for hours. Recall that 
this pi is building and installing master or master-gtk3 many times a 
week. That is working harder than running LCNC.
>
>
>
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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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[John Dammeyer]

> From: Andy Pugh [mailto:bodge...@gmail.com]
> > On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:
> >
> >  I do have a Rpi3
> ...
> > I don't know if that's a good candidate to test LCNC.
> 
> I wouldn�t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have the 
> Ethernet in the USB bus.

I've also read that the Pi4 8GB is not ideal for LinuxCNC.  Apparently it has 
issues with that much memory on the Pi.  It works best with 4GB apparently.

John




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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Andy Pugh]

> On 13 Jun 2021, at 00:28, Leonardo Marsaglia  wrote:
> 
>  I do have a Rpi3 
...
> I don't know if that's a good candidate to test LCNC.

I wouldn’t expect the 3B to work with Mesa Ethernet as the pre-4 Pis have the 
Ethernet in the USB bus. 

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[John Dammeyer]

I'll put my two cents in here too.

First I had to buy a 3A 5V supply because the 2A kept making the lightning bolt 
show up at the top right corner of the screen.  Measured with a 6 digit meter 
it showed about 4.86V   So make sure you have a decent 5V supply.  I'd suggest 
at least 5A and not something cheap.  So now the price of the Pi goes up a bit.

I'm using the MESA 7i92H to a PMDX126 BoB.  I was using the C11 pin file for 
that since it matched the step pin2, dir pin3 model better than the PMDX one 
which had dir pin2 and step pin3. 

Since then I have modified the C11 VHDL file to shift a few things around, 
opened up pin 10 to be GPIO for the ESTOP which moves the encoder down 1 pin 
and now I can try a quadrature encoder on the spindle.Peter Wallace 
compiled the VHDL file for me and I just installed the .bit file and it works 
perfectly.

I've noticed that occasionally on start-up I get the warning message that the 
system may not be fast enough.  Not sure why.  I haven't run the latency test 
and keyed the results into the HAL or INI file so that may be why.  I'm also 
only running a 1GB Pi4 and I've read somewhere that LinuxCNC on the Pi prefers 
3GB so a 4GB Pi4 would be better.   Perhaps some sort of paging is going on 
during start-up that slows things enough to cause the message.   A friend has a 
4GB Pi4 coming in and he's got the same 7i92 so he might see the problem or he 
might not.  I also don't remember if I had WiFi enabled the last time I tried 
it and if that's also a reason for the delays.  Normally I don't like to have 
the shop machine the network.

As far as a PI4 being fast enough for an encoder one shouldn't care.  It's the 
FPGA on the MESA board that's counting that.  Not a parallel port or 3 GPIO 
pins on the Pi.

The Pi4 excels at display handling so I don't think that's a weak spot.  The SD 
card might be.  Absolutely fastest possible should be purchased.  All these 
things do start raising the price over a surplus PC.   Since the Pi4 has two 
USB 2.0 and two USB 3.0 there's usually enough for:
1. USB dongle for transferring G-Code
2. Keyboard
3. Mouse
4. Pendant.

And now you are out of space.  Some of the desktop PCs now come with about 7 
USB ports so add the price of a dangling dongle USB hub.  Best it be USB 3.0

I think the Pi4 4GB with a MESA Ethernet connection will be ideal and all the 
stuff including the BoB and power supply will fit into a smaller box than a 
desktop PC.  So if a compact footprint is the goal it's not a bad idea.  

But be aware you are at the front end of the experience curve here.  Most 
people are still just experimenting with it as a CNC controller.  I have no 
idea how many out there are now in a box, the lid or door closed and just being 
used to CNC parts without thought that it's a Pi doing the work.

For the price of a Pi4 which can be repurposed (I'm using a Pi2 on my Octopi 3D 
printer) and a decent power supply (never a waste of money) you can play for a 
while and if you aren't happy put in the big 64 bit  PC.

My two cents.  And in Canada we don't use pennies anymore so for what it's 
worth.
John


> -Original Message-
> From: Leonardo Marsaglia [mailto:ldmarsag...@gmail.com]
> Sent: June-12-21 4:25 PM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Question about Raspberry Pi 4 reliability
> 
> Hello guys,
> 
> As  some of you know, I'm finishing a CNC router and I'm about to purchase
> all the control hardware. I know Gene, John, and several people here are
> running LCNC on the PI with success but I would like to know how much of a
> pain in the ass is to get it running well with a 7i76E for controlling the
> router.
> 
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
> been doing with all the other machines. I really like the idea of using
> something as portable and small as the Rpi but I don't want to purchase one
> just to test right now... I do have a Rpi3 with Octoprint on the ender but
> I don't know if that's a good candidate to test LCNC.
> 
> What do you guys think?
> 
> Thanks as always and I hope you're all doing well :)
> 
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Gene Heskett]

On Saturday 12 June 2021 19:24:49 Leonardo Marsaglia wrote:

> Hello guys,
>
> As  some of you know, I'm finishing a CNC router and I'm about to
> purchase all the control hardware. I know Gene, John, and several
> people here are running LCNC on the PI with success but I would like
> to know how much of a pain in the ass is to get it running well with a
> 7i76E for controlling the router.
>
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as
> I've been doing with all the other machines. I really like the idea of
> using something as portable and small as the Rpi but I don't want to
> purchase one just to test right now... I do have a Rpi3 with Octoprint
> on the ender but I don't know if that's a good candidate to test LCNC.

I may be the first, or nearly so, to use a pi to run LCNC. Ethernet 
interfaces didn't seem to fill the bill because I wanted to use the only 
hardware ethernet it had as a normal network connection, so the 
interface chosen at the time was the 7i90HD which could be driven by a 
parport, or by SPI.  Since the pi didn't then have a parport, it was 
SPI.

I don't use the radio, but thats a different story/subject.

But LCNC didn't have an SPI interface, so a swedish prof wrote rpspi.ko 
and gave it to us. The pi3 could run my lathe rather nicely, but it did 
keep it pretty busy, so when I wrote the hal stuff to add two more 
encoder dials so I could drive it by hand too, and given that the dials 
were only 100 ppr, I added a 200hz thread to hal and put all that stuff 
in it.

But first I had to build a quasi-realtime kernel, which presented me with 
a problem, the pi folks would not help me install it. So I grabbed what 
the pi needed. organized it in a tarball, that if unpacked to a u-sd 
card with raspbian already installed, put everything the pi needed to 
run this kernel:

 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Feb 6 07:09:18 EST 2020 armv7l

Which is all in one slightly less than 30 megabyte tarball.  Its not 
perfect, but plenty close enough for me until I tried to cut some lathe 
pawns out of air while browseing the evening news with firefox on the 
rpi3. I could hear a stutter now and then.

That started out with a raspian jessie install, then stretch and now the 
same kernel is running raspian buster on a 2 gig pi4. Still booting from 
the u-sd card, but with the pi4, its not dragging its tongue at all, I 
can browse the net while cutting pawns out of air & never hear a single 
stutter from the steppers.

I have a 240G SSD on a usb3 cable adapter, moved as much of the stuff as 
I could off the u-sd to another 120G SSD on the other usb3 port, and am 
building master or master-gtk3 at least daily and installing it, on that 
same u-sd card, for over a year now. I check github for fresh commits 4x 
a day so I'm tracking the buildbot with maybe a days lag maximum.

The only thing I spent extra money on was a trio of 7i42TA's to protect 
and buffer the 7i90's 3 volt gpio stuff, I had some noise get backed 
into the 7i90 and blew some pins on the first 3 7i90's. I redid all the 
grounds onto one BIG star setup, which got rid of the noise at the same 
time I added the 7i42TA's, whose terminals made the interfaceing enough 
easier that I don't regret the cost.

And I recently changed the motors driving that 75 yo Sheldon, for 3 phase 
stepper driven servo's. Much quieter, moves like Casper the ghost now, 
and twice as fast. These have a fault output that I use to kill motion 
as instantly as it can get stopped. Has not tripped while doing a job, 
but I can position it to hit a chuck jaw at cutting speed, and jog it 
into the jaw without damaging the chip in the tool, or making a mark on 
the jaw, so I'd guess its working as intended.

My $0.02.

> What do you guys think?
>
> Thanks as always and I hope you're all doing well :)
>
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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)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Leonardo Marsaglia]

Well, the portability is not a must, but the idea of having all the major
hardware as compact as possible really tempts me to at least consider the
idea. For the other machines I used mini ATX with one PCI express port to
accommodate the Mesa board. For this project I'm inclined to use an
Ethernet card just to simplify the hardware mounting on the cabinet. And
since the Rpi 4 is growing in popularity here, I just needed to ask to see
if it's worth the try.

With octoprint the Rpi 3 is working flawlessly really, although that
doesn't have to do what LCNC has to do, and also I'm not even using the GUI.

El sáb, 12 jun 2021 a las 20:58, Chris Albertson ()
escribió:

> Why does the control computer need to be portable, unless you are building
> a portable router and want the whole machine to be easy to move?
>
> As for Octoprint, I use a standard PC (an older i5 with about 8 GB RAM.) f
>  In fact, the very same PC runs both LinuxCNC and Octoprint at the same
> time just fine without coming close to using all the available CPU.  RT
> Linux makes sure the bits of EMC that need to run in the real-time run in
> real-time   Even with streaming video and a remote log-in, the PC is not
> half loaded and neither is the gigabit Ethernet.  PCs are so much more
> powerful then RPI.
>
> I use the Pi4 for mobile robots that need to run on battery power but I
> don't see the point with AC mains power is available.
>
> On Sat, Jun 12, 2021 at 4:28 PM Leonardo Marsaglia 
> wrote:
>
> > Hello guys,
> >
> > As  some of you know, I'm finishing a CNC router and I'm about to
> purchase
> > all the control hardware. I know Gene, John, and several people here are
> > running LCNC on the PI with success but I would like to know how much of
> a
> > pain in the ass is to get it running well with a 7i76E for controlling
> the
> > router.
> >
> > I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as
> I've
> > been doing with all the other machines. I really like the idea of using
> > something as portable and small as the Rpi but I don't want to purchase
> one
> > just to test right now... I do have a Rpi3 with Octoprint on the ender
> but
> > I don't know if that's a good candidate to test LCNC.
> >
> > What do you guys think?
> >
> > Thanks as always and I hope you're all doing well :)
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[Chris Albertson]

Why does the control computer need to be portable, unless you are building
a portable router and want the whole machine to be easy to move?

As for Octoprint, I use a standard PC (an older i5 with about 8 GB RAM.) f
 In fact, the very same PC runs both LinuxCNC and Octoprint at the same
time just fine without coming close to using all the available CPU.  RT
Linux makes sure the bits of EMC that need to run in the real-time run in
real-time   Even with streaming video and a remote log-in, the PC is not
half loaded and neither is the gigabit Ethernet.  PCs are so much more
powerful then RPI.

I use the Pi4 for mobile robots that need to run on battery power but I
don't see the point with AC mains power is available.

On Sat, Jun 12, 2021 at 4:28 PM Leonardo Marsaglia 
wrote:

> Hello guys,
>
> As  some of you know, I'm finishing a CNC router and I'm about to purchase
> all the control hardware. I know Gene, John, and several people here are
> running LCNC on the PI with success but I would like to know how much of a
> pain in the ass is to get it running well with a 7i76E for controlling the
> router.
>
> I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
> been doing with all the other machines. I really like the idea of using
> something as portable and small as the Rpi but I don't want to purchase one
> just to test right now... I do have a Rpi3 with Octoprint on the ender but
> I don't know if that's a good candidate to test LCNC.
>
> What do you guys think?
>
> Thanks as always and I hope you're all doing well :)
>
> ___
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> Emc-users@lists.sourceforge.net
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>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Question about Raspberry Pi 4 reliability

[R C]

I have several RPI3's and RPI4's.  what I noticed (with the RPI4)  more 
memory is always better.


There are  things they are good at, especially "light-weight" stuff, and 
other things they are not.   I use one as a datalogger, I tried RPI3 
RPI4-1GB/4GB/8GB, and it has timing and temperature issues.


(I am not using them for CNC).  I use aa RPI as a datalogger for a 
seismograph, that seems to be pushing it,  I use one for home 
automation, like switching off/on lights (which is not time critical), I 
use it for reading humidity/temp data, also fine because there are no 
timing critical things with that either. (I don't care if the lights go 
on/off a half second sooner or later)


they are pretty powerful little ARM computer/boards..  BUT  it is a 
$40-$80 piece of equipment... you get what you pay for.


I run CNClinux on a Dell, 172GB, dual cpu, 24 cores, I don't think an 
RPI can match that. an RPI might be able to run a CNC machine..  but if 
I'd do it, I'd do it for "funsies" to see if I can get away with it and 
make a point.


(I've been known to do things like that, just to see if I can get away 
with things.)


For example ..  what an RPI is not good at... is reliably read a 
quadrature encoder output, and I know some use these encoders.




but that's just my 2cts.


Ron



On 6/12/21 5:24 PM, Leonardo Marsaglia wrote:

Hello guys,

As  some of you know, I'm finishing a CNC router and I'm about to purchase
all the control hardware. I know Gene, John, and several people here are
running LCNC on the PI with success but I would like to know how much of a
pain in the ass is to get it running well with a 7i76E for controlling the
router.

I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
been doing with all the other machines. I really like the idea of using
something as portable and small as the Rpi but I don't want to purchase one
just to test right now... I do have a Rpi3 with Octoprint on the ender but
I don't know if that's a good candidate to test LCNC.

What do you guys think?

Thanks as always and I hope you're all doing well :)

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[Emc-users] Question about Raspberry Pi 4 reliability

[Leonardo Marsaglia]

Hello guys,

As  some of you know, I'm finishing a CNC router and I'm about to purchase
all the control hardware. I know Gene, John, and several people here are
running LCNC on the PI with success but I would like to know how much of a
pain in the ass is to get it running well with a 7i76E for controlling the
router.

I'm trying to decide wheter I purchase Rpi 4b or I use a normal PC as I've
been doing with all the other machines. I really like the idea of using
something as portable and small as the Rpi but I don't want to purchase one
just to test right now... I do have a Rpi3 with Octoprint on the ender but
I don't know if that's a good candidate to test LCNC.

What do you guys think?

Thanks as always and I hope you're all doing well :)

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