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Hello Everyone!
I'm new on Forum but thanks to Yours knowledge You share on forum which I'm very thankful for,  I built my own cnc machine (I'm during completing mechanical parts), but looks that software it working as it should (Z axis already built - the hardest). I'm wondering if someone built up with success configuration rpi4 + 7c81 + 7i77 + mx4660, because I want improve positioning. I'd like to not changing config of current set but only add 7i77, could someone advise me how to do that and if its working at all as it should?
Thank You in advance
Best Regards

forums.raspberrypi.com/viewtopic.php?t=339068

www.makeuseof.com/tag/raspberry-pi-wont-...e%20HDMI%20detection.
 

I am now designing my first CNC controlled by an ARM SBC, it's going to be a small and simple 3 axis machine. RPI4 seems to be the most supported option: SPI for Remora and RIO.

RPI 4 comes in 4 different  RAM configurations: 1GB, 2GB, 4GB and 8GB. Which configuration would be optimal?

Hi,
I was using a screen connected to the display port of the RPI, and through this port there is no image.
I used an HDMI screen and it gives an image and the RPI starts up fine, although the behavior of the LEDs is the same.
I will continue testing.

Hi,
I have RPI4 4GB and I used a 32GB SD to flash these 2.9.2 and 2.9.3 images and also from the download link from the linuxcnc site, but the RPI does not boot and the red LED stays on for a few seconds and then turns off and the Green LED keeps flashing for a few more seconds and then both LEDs turn off completely. The screen shows nothing and remains gray.
The RPI works fine with the original raspbian image with the same 32GB SD.

Greetings.

DoWerna wrote:

Hi
seem to have stumbled into a little project.
 

I have already retrofitted my Maho MH500 and a cycle lathe to Linuxcnc
retrofitted, which is why a friend has now asked me to have a look
to have a look at his bending machine.

The press was probably retrofitted to a newer control system.
However, it has now stopped working and when I switch it on I get the error message

"WARNING LOST VIDEO TABLES"
 

if I google this I only find 3 forum entries, but without any answer or even a solution.
I can't say whether the controller is broken or "just" lost the programming or parameters...

In any case, I now need a replacement.
A simple 3-axis positioning controller.
The controller would only have to control 2 stops and the press stop.

all 3 axes have analog -10/+10V drives
there are probably 3 encoders somewhere for the position feedback
and that's about it.

I don't need cycles and bending programs.
If we get the 3 axes into the desired position via the control system and
then operate the press hydraulically as usual is enough...


If the machine were in my shop, I would say
Linuxcnc Raspberry, small TFT mesa card and I operate the thing via Gcode in MDI.

Maybe there is a simpler standalone solution?
 

What is your time frame?
This might come across as ridiculous but I can handle the whole thing on a $10 RPi Pico 2 + support devices

This chip has "PIO state machines" and I am reading 4 quadrature encoders with a maximum rate > 5M quadrature counts/sec without using any of the two cores' processing power.

One core of the RP2350 MCU handles the servo PIDs + velocity profilers and the other core handles video. Motor command is 12-bit +-10v

I have been designing/building metal forming controls (up to 21 axes) since 1988 and this is my latest development. Right now I have a bunch of CNC tube-benders to retrofit with this thing (3-axis and 5-axis) and the control development is on-going.

Just thought I'd throw it out there. 

Example of one of my tube bender retrofits  Microcontroller motion system and an Android tablet (protected) front-end

Hello,
I wanted to replace the external Linuxcnc control PC on my mill with a dedicated control inside the electrical cabinet, but I needed something compact that is easy to wire inside an enclosure, which is why I thought of using the RPi5 and a custom designed GPIO breakout board.

 

The board is intended to be used as a 5 axis step/dir platform with 6 extra outputs and 10 inputs. All the Raspberry pins are digitally isolated and the outputs are buffered with 5V @ ~20 mA drive capability. The board has dedicated power connectors for the 5V RPi supply and 24V isolated bus. A 5V step down converter connected to the 24V bus provides the necessary voltage to run the digital isolators and buffer gates.

Here's the new repository with the Kicad design files: github.com/atomicmill/raspberry-pi-5-Linuxcnc-hat

So far I tested the board with LCNC 2.9 and the Probe Basic and PlasmaC UIs. I hope this board is of use to anyone looking for a low cost all in one LinuxCNC control.

I bought a few very old motherboards for $5-$10 to run CNC, which is much cheaper than the Raspberry Pi.
Post a test record, which I think this is a configuration that can work stably, for reference.

Configuration 1: ASUS-M4A88T-M with built in paralletport+AMD640iiX4+ATI graphics old card + RTAI.  

 

Latency test 3 hours, seems to be good, but it is fake.
In order for the parallel port-stepping configuration to work stably, this value needs to be set to more than 9000 in setpconf, otherwise there will still be rare random errors, such as following errors or latency spikes.
The built-in graphics card can be used and without spike, and adding a graphics card can reduce the Latency slightly and obtain a good color, But once add a graphics card, it will have spikes issue. - no matter how much Latency value is set, so it must be add a option to GRUB:    radeon.dpm=0 

Several key points:
in GRUB:
radeon.dpm=0 Causes GPU to overheat
idle=poll   Causes CPU to overheat

in BIOS:
CPU Over Voltage <= 1.25V   Otherwise, it will overheat and crashes
ACPI APIC surpport = Enable   Otherwise, Linuxcnc crashes with the RTAI kernel 
others, as far as possible set Manuall or Fixed value

A confusion
on AXIS GUI graphical display area, LEFT click will causes the rolling coordinate numbers to be halt/pause update.
no interference with machine moving.
 

Linux is good as it quite verbose when an error occurs. New users not so good as often they don’t relay the error messages that Linux gives them. Then experienced users have to spend a lot of time getting the exact message from them. Then both sides get upset.

Enough sarcasm.
The latest official ISO from the Linuxcnc home page is the way to go, it should “just work”.
Regarding your error, please relay the exact error you are getting, then we can move on.

The thing is you have to realise when switching to a new OS there is a learning curve. No one comes out of their Mummy’s Tummy knowing how to use Windows.
I would be in the same boat switching to Windows, the last version I used was Vista. Since then I’ve been exclusively Linux.
Ignore what the self proclaimed experts say about having to be a programmer to use Linux.
A funny thing is that not a lot of people complain about Linux when using something like a Raspberry Pi, little weird hey ?

Fear not my friend we will get you sorted.

Hello everyone,
Thank you for this forum and the work accomplished. Knowing a little the possibilities of configuration of this software this update is for essential.
a few years ago I built a complete 5-axis continuous milling machine under linuxcnc.
It works very well with a // port and a STV2 “break out”, DMA860H drivers and a VFD. so I control :
- 5 continuous axes
- Spindle stop/run/speed ( G code )

However, not enough I/O for coolant and other functions.

The only drawback is that I'm “obviously” lacking precision with 5 continuous axes. I therefore need to install rotary encoders on my B/C axes. But there's no more possibility on my Break Out card. So I have to change my system completely.
I want to start with Raspberry Pi4 . Despite the tables above, I'm not sure about my choice of Mesa boards. What would you recommend for such a configuration?

Thank you in advance.

 

jjdege wrote:

Thanks so much!



unlike the installation of the EtherCAT packages that gives me an error


 

i don't know what it depends on, maybe we need to wait for Etherlab to update the repositories

 
forum.linuxcnc.org/9-installing-linuxcnc...i-5?start=220#306099

Oh thank you so very much! I thought I was going crazy. Your explanation makes a lot of sense.

Might be nice to add a note to that document to clarify this as it's not incredibly obvious. I'm a LinuxCNC newby and I'm not sure of the protocol for making changes like this but if it's something I can or should do I'm happy to try adding a note. Thanks again!

and everything is right!
The fact is that the pin outs of the Raspberry are inputs for the LinuxCNC and vice versa...

You will see that if you configure input pins with hal_pi_gpio, in the halcmd show pin command they will be shown as OUT

 

That is exactly the document I have been using. As a test I tried to configure just one GPIO pin as an output - but when I run Halcmd Show Pins in a terminal that pin is showing up with direction set to "in"

Is there any chance that I don't understand what "Show Pins" is reporting. What does "direction" mean in this context - is there any chance that I do want direction to be "in" for an output? That seems unlikely.

jjdege wrote:

hi
here is the report with uname -v

 

no RT, yet it works, something went wrong

which kernel is working?

If you want instructions to create a PREEMPT_RT for Raspberry Pi 5 with native Raspberry OS you can see at this link

forum.linuxcnc.org/9-installing-linuxcnc...pi-5?start=40#303696

or use the ready-made image you find here

forum.linuxcnc.org/9-installing-linuxcnc...pi-5?start=40#303752

Then follow the procedures already described for Ethercat drivers