Elumatec SBZ 130/01 retrofit

Nope, not on the NAS.
I have to check some 15 USB drives and 3 phones as i get the chance ...

Aside from the schematics, I have a question. When you retrofit the machine, do you remember what locking mechanism was present to lock the spindle to each tool after the tool is changed? Any sort of clutch or clamp mechanism (hydraulic/electric/mechanic, pneumatic)?

On the left side of the head is a small lid, remove it and check the worm gear inside.
Mine was badly worn so it would sometimes miss the exact position and fail to lock.
When locked manually, it never moves.
And yes it does use a clutch, it is very hard to access it and mine was worn badly so the tools would change even with it locked.
Despite all that, it is still in daily use, all day long, but the tool changer gets rarely used, drills and mills are the only tools they need.

Yeah, I opened the lid and found the wormgear. There seems to be a hexagon-shaped component on the top of the worm gear, it looks like it's made of MS but I'm not sure. I guess it must be a metallic target for the plastic component on top of it which looks like a sensor. What do you think?

On a side note, is it possible to use another controller plc but keep the same drive modules at least for the spindle and the supply unit using GSK controller or some other plc instead of Mesa cards and Linuxcnc?

Yes, if i recall correctly, that is one sensor for the toolchanger that tells the motor when to stop spinning, it also uses 4 more sensors in gray scale mode for counting the tools.
As for PLC, i never use them, nor do i plan to.
I use exclusively Mesa for everything, and no, i am not affiliate nor do i have any relations to them, their boards just work, 24/7 for years on end without a single issue ever, and their support is the best on planet earth, as you can find out on this topic/thread, i needed non standard firmware for the existing absolute encoders and got it from them the next day, Try that with any other company....

can we use mesa with the existing ferrocontrol motors?
And what mesa cards do we need in total?

On a side note, my employer also said he wishes to have another rotary milling head attachment, a circular saw with multi-axis movement. For this attachment, are there any extra things I need to consider when deciding the parts?