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You need the 7i96S for spindle control.

You may have purchased the wrong one by mistake. I almost did that!

I'm not sure yet. I installed Debian Trixie on an i7 the other day. It uses 6.12.6. I installed Linuxcnc on it from the Debian repositories (which also installs linux-image-rt-arm64 as a dependency) and everything worked correctly.It might just be an ARM problem,

Hey, everyone.I'm doing a linuxcnc conversion on a ShopSabre 23 machine. Just got a 7i96 board in the mail and have been setting it up on my desk. It's been good so far, got the relays and endstops working. Unfortunately the spindle is giving me some trouble. We have an 18k rpm spindle driven by Mitsubishi A800 VFD which accepts 5-10 analog speed control.

I was under the impression that I would be able to convert PWM into analog voltage with this card and that's how I set it up in the Pncconf 18000 rpm at 5v, but the rpm readout in qtdragon only goes up to 500 for some reason. The spindle setup looks like another stepper config and I'm confused about the scale. I've read pretty much every spindle related post here which lead me to more confusion since everybody has different hardware.I haven't flashed any firmware on the card, just working with the stock one that it came with.I have a PWM to analog converter board

Here is the VFD manual   you can find the speed control on page 115

Can somebody please steer me into the right direction?I will include my ini an hal files just in case.

Later versions of Debian (we use debian 12 bookworm) requires careful optimisation on 2 core machines. I would suggest a 4 core Celeron, 4gb RAM, any sized SSD

Thanks Rod,

I gave this a try because I was excited to read that "This release includes realtime support (PREEMPT_RT), a feature that has been in the works for 20 years." So is there a bug in the PREEMPT_RT support in the 6.12 kernel, or is it simply not implemented the way LinuxCNC has come to expect? Obviously LinuxCNC needs to support a working standard.

Yes. you could try sudo apt install linux-image-rt-arm64

Yes the kernel needs to be specifically built to support preempt_rt even in kernel 6.12
It seems that on the Pi a default 6.12 RT kernel build is not recognised by linuxcnc unless the kernel has additional settings that are provided in the patch. This may end up being fixed by the kernel developers in later versions

This may not be relevant to you but building a custom image that includes Linuxcnc is not trivial and requires building a kernel from source so it needs to be a RT kernel.