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Thanks for the quick reply. I've been referencing the servo tuning guides, which have been helpful. Would you go higher or lower on FF1 and how do you best determine if the f-error is at an acceptable level? The drives move smoothly, but unsure how much more tuning is needed.

For the polarity issue, would that be in the wiring, swap terminals at the board?

Well Linux just gets more attractive every day.

 

I guess you didn't watch the presentation or pay close attention.

The driver for the Mesa PCI\PCIe cards are loaded during the startup of Linuxcnc.

Linux has no issues loading kernel modules for supported hardware that are added after installation, if this was not the case live versions of Linux wouldn't work, installers for Linux would fall over.

If you have ever read the output of dmesg you would see very clearly that the kernel detects the installed hardware and loads the kernel modules as required, or the hardware may have support compiled into the kernel. With the caveat that the kernel "knows about the hardware". There is absolutely no need for the hardware to be present during installation. For hardware that is "hot swappable" the hardware is not required to be attached/inserted/present during boot, it is detected when inserted, and no this is not limited to just USB devices.
I'm quite astonished at the amount of information you post that is wrong. This is quite a distressing matter as one day someone will take your advice as true and have a very bad experience. You really need to reassess your level of knowledge and take some time out and sit back and learn.
When you are not being wrong you are not addressing the subject matter and being unhelpful.
As I've suggested before read a book and learn.

Linux loads hardware modules at boot time, no matter if it was plugged in during install or not.
Proprietary modules/drives will nor be loaded during install nor after, they will have to be installed separately, like NVIDIA or AMD ROCM drivers.
Linux is extremely good with this as you can even add hardware while the PC is running, granted that hardware does not require BIOS initialization, and it will happily load required modules, like USB video grabbers, and in some cases SATA and PCI-E stuff like hard drives and NVME if set to "hot plug" in BIOS.
I recall having to reboot the windows PC to be able to use the USB stick you just inserted...ah the trauma!!!

FF1 can be tuned further to flatten the ferror plot

Once this is done, you can usually add some I term

If a SSR seems on all the time, it may be that you have the polarity backwards