The turbomolecular pump arrived and I got a first look at what I was dealing with. It was much more massive than I thought it would be. ^^U

That's my vacuum chamber on top of the turbo. Now it looks absurd to do make some kind of adapter.

The pump came with a holding ring, but it had a weird shape and clamping holes, so I decided to make a new one:

At first I was going to CNC machine it, but I messed it up a bit, so got angered and decided to machine it by hand, cutting the "ring" from the stock with my new cheap plasma cutter:

This is probably at the limit of what this super cheap machine can do, but hey, it took me only 5 minutes to cut, so it was well worth:

Nothing that can't be cleaned with the angle grinder. XD
It looks much nicer from the top, tough.

After that, it was mounted on the milling machine and brought to dimensions:

The outside perimeter and faces where finished in the lathe, wich was at it's workholding limit, btw:

It came out okay, with a bit of extra play, but nothing that can't be lived with.

Tha will tension the top of the chamber so it can't disastrously open to atmosphere. I won't drill the holding holes until I figure out how to tension everything.