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Haven't been working on this particular board a lot since I don't use it myself. Been busy with a voltage reader for plasma and IO, for my plasma cutter and that works great.
If you continue to use the STM32F407 you should check that there are free timers available. Probable there are, but I used a lot of timers I remember.
Earlier in the thread there is an attachment with spindle control schematics, maybe you already had a look on that one.
My spindles are all controlled via Modbus/VFD and the 3V analog output was put there for good measure.
There could have been connectors for I2C and SPI to easily add on functionality controlled by the STM32. Maybe something you can think of.

7i92 P2 7i77 serial 7i73
I said above that analog was confirmed, not true as I was seeing parameters, not pins.
I've read many posts about enabling the analog mode for inputs 0-7, but cannot get my head around the syntax.

looks like it might be
loadrt hm2_7i92.0.7i73.0.2 config="sserial_port_0=01000000"

But I'm not certain

Would you check for please.
Thanks

Ah yes I found a similar thread saying the same:

www.cnczone.com/forums/uncategorised-cam...are.html#post2541766

Thanks for the reply JT
I have since reconfigured the axis wiring and discovered that there was a very slight and extremely slow movement which has been overcome by resetting the homing speed . We are still using version 2.7 as we had this working adequately two years ago and I would prefer to ensure we have a working machine before I upgrade the OS and install 2.9.
The homing on our z axis is working extremely well with a pair of relatively new mechanical micro-switches but x and y are proving stubborn with our original switches that are about 20 years old so I will by some new ones and see if their response is better.
We only get to work on this machine a few hours per week so changes are rather slow.
Thanks once again.

i was not happy with the force to spin this thing but it seems the bigger you go the greater the torque needed based on some digging with manufacturer specs i found. i found these that i could buy over seas but they require 3.5 Nm of torque. i'm not sure if that is breakaway or running torque? i'm thinking it's breakaway but i am not sure at this point. if i can figure out a way to test this so i can get a feel for it i might be at a fork in the road moment and end up just biting the bullet and buying these is it seems better than what i was seeing with what i was doing. 3,5 Nm seems like a lot of torque needed?