Retrofitting an 89 Chiron FZ12W aka Igor

Since the Machine is running well except for some minor issues:
mesa card sometimes doesn't answer I din't figure out what's the problem after four or five tries ist works well.
and the Encoders sometimes loose signal, then i'ts time to wiggle some cables and the it works again.

I wil do some milling in the next time, so I addressed some other thing which I disliked. The first LED I added was falling apart, so I added e third of the ones I installed later:

I am happy with that. Last winter the water treatment for the Coolant I attached to the mill froze. So It was time to get a new one. This time It's in the room next to my heater room, so it won't freeze again. And I got a mixer which eases refilling a lot. But I have to carry it to the machine. I think for my hobby workshop it is OK.

And I removed the old tool storage and made new ones on Din rails

and I made me some tool tags, the third version I liked best (left one I found on thingiverse, middle my first try, right ma final version)

This wee I should get some magnets, wich should make the even more convenient ti see what tools are loaded. By just sticking the to the housing.

The tool cart also got an upgrade with two short din rails

Hopefully this will keep me more organized, but knowing me I doubt it a bit.

Finished the tool storage for the mill yesterday:

Hope this will work as good as I think

Having trouble with the old lady.

After an engraving when she was homing, the z aches started humming and I got an Joint following error.
Did the a full restart, can power her up z is humming, but as soon as I try to move Z the following error kicks in.
My first Ideas was that the brake release is defective, but I checked that. The brake releases just fine and Z is free to move.
I didn't change the PID. I can rule out the encoder (this looks different, then the machine is runnings slowly to an endstop (happens on x some times usually a wiggle on the cable at the drives helps))
With the Z Axis trouble sooting is a bit tricky.
To rule out the Z out / in on the Mesa board I can go to a different analog out and encoder in (X and Y are fine). Which would be my first step now cause it's easy, but I doubt that's the reason though it
Has anyone here a suggestion where to start?

Thanks Patrick

To rule the Mesa board out I could use

any update?
I would try swapping axis at simodrive
if you touch Z axis motor with your hand do you feel it vibrating? does it get warm when not moving only holding its weight?
I had to change my Y axis motor because it was getting hot, turns out when opening it, it was rusty inside
My Z axis motor is vibrating, you can't see a movement in DRO in linuxcnc even a micron but you can feel it

no progress here,
It's not the mesa board, I checked that.
I can see the Encoders jumping, and see the Servo oscillating.
But it won't move more than +-0.05mm

I removed the belt an supported the the Axis so I can play a bit around.
Without the weight of the z axis it doesn't even oscillate.
The encoder works fine, With the drive disabled and the brake released the servo ban be turned easily by hand. I should have a drive for a 4th axis at least its written on the simudrive. I think it's time to search the drive documentation and check if its the servo or the drive. If its the drive and I can use the 4th axis drive a I am fine.
If it's the servo I'll search for a new china servo with drive.

Maybe the servo has lost a phase? (or the drive has)

You can check the servo with an ohm-meter (with it disconnected from the drive). It could be a loose phase wire somewhere, too.