Considering a Full Rewire on a Working Schaublin 125 CNC

No its Mach 3. The seller of the Mashin did not include the hard drive so i had to install windows and Win11 was just wat i downloaded.

Blech.

Windows 11.

Make sure you uninstall OneDrive as it slows down everything even if you don't use it or enable it for some reason (don't ask me why).

Thanks for the sugestion. As I now dsided to go full Linuxcnc i will not use the system as is wary mutch. But i will seranly keep it running for now to find some stuff about it out.

Welcome to the Schaublin retrofit club.

Could it be that that corner tool holder just has the height stop mounted on the wrong side, and flipping it fits? Or could it be that it fits on the aft mounted single tool post?

That AC servo installation on the cross slide looks nice. Your Z axis AC servo is a beast, and still smaller than the 1970's drive.

Could you please post some close up photos of that MACH interface board at top RH in the control cabinet. Is that something like a smart servo for Mach 3?

If it works, I would probably run it for a while and make some parts as is, just to see if there are any other issues you need to know about.
Cheers,
Mark

The aft-mounted one, I didn’t even think of that. I’ll try out tomorrow if it fits. It’s not just the wrong way around; there are no threads on the other side.

The servo is really much larger than needed, but buying a more suitable one when I already have this one on hand seems silly.
The controller is a CSMIO/IP-S
(link: de.cs-lab.eu/sklep/6-achsen-cnc-steuerun...und-simcnc-software/)
They seem to be sold on eBay for a decent price sometimes, so this might be the first retrofit in history that doesn’t cost more than expected (…it won’t).

To really run the thing I “only” have to replace the encoder belt on the spindle. If there’s one part I didn’t want to mess with, it’s the spindle — but I don’t think I have a choice here. I’ve seen some really bad belts, but never one that still worked despite having sections with no plastic left.

I’m considering just pulling the spindle and putting it right back in. What do you think? You replaced the grease without disassembling the bearings, right? Would you do it that way again?

If you can add grease to the bearings without disassembly, do that.

I recommend synthetic grease.

You don't want ultra-thick grease, but you also need it to be thick enough to prevent wear.

If the Mach 3 install is new, is it even configured?

The question about the grease in my head is that the spindle seems properly lubricated right now — no strange feeling, no signs of anything bad. So if I pull the spindle and put it back after installing the replacement belt, I’m hoping I won’t make it worse than it is. When it comes to regreasing these high-precision bearings, I’m hesitant — I’d rather learn on less costly spindles first.

Regarding Mach: the seller provided a copy of his Mach3 folder. I didn’t know this before, but you can just put that folder on the PC and it works—no installation, no configuration, no compiling anything custom.

Change the belt and leave it for now.

Focus on what does not work, then make little improvements.

It is not difficult to pull the spindle. I just welded up a U frame to pull against and used all thread to draw it out. 
Schaublin recommended disolving Kluber in some solvent like trichchlorethane which we cant get. I don't yet know whether I screwed up good bearings or saved them. Time will tell. Starting over I would probably have just injected a little fresh grease. It is easy enough. 

If the dovetail fits, you could also just drill and tap the height adjuster holes on the other side.You can never have too many tool holders

I wonder why the replaced the X servo, but left the Z one?