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7c81 configuration with 7I77 on P1, MX4660 on P2 and just GPIO on P7:

 
 

Currently I'm using that:
freeby.mesanet.com/7c81_mx4660x2d.zip

Can I ask You to make it in way:
P1 = 7i77
P2 = MX4660
P7 = GPIO
if it's not plenty of work?
I'm asking because that will help me with arrange space in cabinet.
Thank You in advance

and in connection with photos above
I manually added config for pncconf for 7c81 and 7i77 and mx4660 but something is wrong in comparision to 5i25 + 7i77:
  i cant find where is mistake, everything looks ok, maybe You know?
 

I'm not sure what you are suggesting

What firmware are you using currently?

I would probably make firmware something like

P1 = MX4660
P2 = 7I77
P7 = GPIO
 

I'll appreciate it. I'd like to connect via P1 because i leave it for encoders in future and time has come (based on other users experience). I already use P2 and P7 for communication with mx4660.I've tried to add configuration to pncconf but TXEN2 TXDATA2 and RXDATA2 don't want appear, do someone know what I'm doing wrong?

Thats what inside file:
    ['7c81-Internal Data', '7c81', '7i77 + MX4660X2', '7c81', 'hm2_rpspi',
         7,3, 0,0, 1,1, 0,0, 4,2, 1,2,[],0,0,0,0,0,0,0, 1, 57, 100, 200,[1,2,7],
        # TAB 1
        [S.TXEN2,0],[S.TXDATA2,0],[S.RXDATA2,0],[S.SS7I77M1,0],[S.RXDATA1,0],[S.SS7I77M0,0],[S.RXDATA0,0],[S.MXES,0],[S.MXE0,0],[S.MXE1,0],
        [S.MXEI,0],[S.MXE0,1],[S.MXE1,1],[S.MXEI,1],[S.MXE0,2],[S.MXE1,2],[S.MXEI,2],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
        # TAB 2
        [S.GPIOI,0],[S.PWMP,0],[S.STEPA,0],[S.GPIOI,0],[S.STEPB,0],[S.STEPA,4],[S.STEPA,1],[S.GPIOI,0],[S.STEPB,1],[S.STEPA,2],
        [S.STEPB,2],[S.STEPA,3],[S.STEPB,3],[S.ENCA,7],[S.ENCB,7],[S.ENCI,7],[S.GPIOI,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
        # TAB 7
        [S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],
        [S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],[S.GPIOI,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
    # TAB 5
    [S.TXDATA0,0],[S.TXEN0,0],[S.RXDATA0,0],[S.NUSED,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0], [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0], [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
    # TAB 6
    [S.TXDATA1,0],[S.TXEN1,0],[S.RXDATA1,0],[S.NUSED,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0], [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],
        [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0],[S.NUSED,0], [S.NUSED,0],[S.NUSED,0],[S.NUSED,0],],

 

hello

to update what I wrote here

I resumed the installation of LCNC + etherCAT on native Raspberry Pi 5 OS.

I turned the raspy back on and there were some updates to install, after doing this I ran this in the terminal

everything works on native OS with audio and video graphics ok!!!


 


 
 

You would need a MX4660 +7I77 firmware configuration
for the 7C81. I can make one if that's whats really desired.

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.