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Hello I have Raspberry pi 5 and byte 2 bot hat on my mill and it works very fine and now i try to convert it to my lathe with a problem with the spindle speed reading and the index and phase a for cutting thread in the lathe . I have tried to read and understand the Hal mystery with a minor of luck . In Hal Meter i there are a signal at => lowpass.0.in but reading zero at  lowpass.0.out  => abs.0.in pyvcp_options.hal . Can somone helpfull help me with this problem / krister

There is a Linuxcnc image for the RPi. There is nothing special about the image, it is just Debian Bookworm with the Linuxcnc packages installed and a realtime kernel built from the Raspberry Pi official GitHub sources with the RT-Preempt enabled, no non RPi patches are added.
I can confirm booting from SD card, USB and Nvme all work.
For touchscreen I would be more inclined to use one with a USB interface that enumerates as HID, it is far easier to setup and basically "just works". This has been confirmed with a generic touchscreen bought from AliExpress, 10.1" in this case.
For a small form factor, x86/64 is the best bang for buck, I would suggest looking into the Odroid H series, I have been using an Odroid H3 since its release and it has not let me down.
Even a 3rd gen I5 is a better solution than the RPi 4 or 5. The only advantage is the small form factor and being able to connect to a Mesa SPI board. Compared to an ex corporate PC it is quite an expensive option.
The above opinion comes from use of the RPi-400, RPi5 with an Nvme drive and use of an Lenovo ThinkCentre with an i5 I found by the side of the road that someone was throwing away.

Moved to "computer and hardware".