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I'm looking for free cam software / g code generators for up to 5 axes cnc that works with linux cnc on a raspberry pi 5 for free or under $100. 

Odroid H3+ any time of the day. I've had mine for ~4 years never has missed a beat.

X86 based so very very simple. Dual NICs are great for mesa ethernet cards.

Odroid H3+ vs orangepi5 ?

You can try the old-school approach and just use the parallel port.

Or the GPIO on the Raspberry Pi.

Hi,accroding to the doc saying "STM32 based controller boards

NVEM - an STM32F207 based board with Ethernet PHY chip, originally intended for Mach3. [No longer in production, Legacy Support - no new features]

EC500 - an STM32F407 based board with Ethernet PHY chip, originally intended for Mach3. [No longer in production, Legacy Support - no new features]

Expatria Technologies Flexi-HAL with uFlexiNET Ethernet adapter - an STM32F446 based board with W5500 Ethernet SPI adapter designed for Remora

iMX RT1052 based controller boards

NVEM, EC300 & EC500 - iMXRT1052 based controller boards with Ethernet PHY chip, originally intended for Mach3. [In active development]

RP2040 based controller boards

WIZnet W5500-EVB-Pico - Raspberry Pi RP2040 based development board with on-board W5500 Ethernet SPI adapter

Expatria Technologies PicoBOB-DLX - Raspberry Pi RP2040 based board with on-board W5500 Ethernet SPI adapter designed for Remora" it looks there is many alternative choice except for mesa board. but it also said these board is originally disigned for Mach3 ,need to be flashed the firmware.I dont know where to find those program ,could you tell me the links? Thanks you !

Change in your ini file
SERVO_PERIOD = 1000000
to
SERVO_PERIOD = 2000000

Change
SERVO_PERIOD = 1000000

to
SERVO_PERIOD = 2000000

How to lower the servo thread period?

Sorry mate didn't realise you were still crook. 10 days did my head in when I had my femur fixed up with a Ti rod.

Feel free to fork my repo and take over the management of the installer.
15 days in hospital with still no Idea what is going on has made me a dat grumpy!

Oh come on who was this image for ? You or the community ?
ssh is pretty common utility not just for remote login but transferring files from one machine to another.
gvfs makes samba mounts effortless via the file manager, even The Debian installer now includes it as default, on a compressed image it takes up bugger all, and when uncompressed it takes up bugger all as well. Adding those two is really of no consequence to the size of the image. And from what I’ve seen it adds nothing to latency.
I agree with you regarding the keyboard thing but your reply “All of your issues are for programs I never use” is just bad form. Even a graphic network manager would make life easier for new users.

The raspberry Pi5 iwas released as we released the image for the Pi4b.
We reworked the installer for the different chipset. Use at your own risk.

A small footprint X86 machine like the Odroid H3+ or the LattePanda V1 are likely better choices but cost a bit more

All of your issues are for programs I never use. ssh maybe should be included.
I thought somebody got tigervnc working the other day.
I did not want to add any bloat on such a small SBC
I would not dream of installing any OS without a keyboard to start with
There are some notes on the linuxcnc download page

Although it doesn't have 5 step/dirs I'll mention my board here anyway. The firmware and component are loosely based on Remora SPI, and the hardware is somewhat similar to cakeslobs board:
forum.linuxcnc.org/show-your-stuff/50177-weeny-solder-bot
github.com/iforce2d/weenyPRU

The MCU is basically a 'blue pill' and unlike Remora the configuration of pins must be done in source code. It would be easy to alter the spindle PWM output to be a RC servo signal instead, assuming you don't need an actual spindle of course. But not so easy to add a 5th axis, I would need to check if any timers are still unused.

btw a 4Gb Raspberry Pi4 or Pi5 cost only 64 euro here in New Zealand, after being shipped halfway around the world. Why are they so expensive in Europe, makes no sense. As others have said, best to avoid the Pi5 for now if you want to use SPI.

Hi all im currently building my second cnc, and it is pretty small one. A little bigger than a 3d printer. I was to the point to chose a controller and i first think about linuxcnc but because it a small cnc its not the best choise because it require a "big" monitor. So i looked at the other options avaliable.
-Grbl, very limited in functions, require an external computer..
-Mach3, looks bad, lot of bad comments..
Anyway the only system that was the closest to my needs was chinese DDCS controllers but they are not very customizable and dont support all the gcodes that i want.
So finaly i decided to keep going with linuxcnc! The best one so far at a resonable cost! Then I decided to build my own interface. Or modify an existing one.

For the GUI design im pretty sure i can do it all but for the programming i think im gonna need help. If anyone is interested in this project to help me your welcome! 

The interface is for a 7 inch display and running on a raspberry pi 4 with a 7c80 mesa card. 
It will be a keyboard and optional touch screen navigation based interface. Here are some pictures of my design so far!

Let me know what you think about it!