There is often a reason when things are sold cheap. I've disassemble and cleaned the mill now. What I found so far is:
- The vertical drive slips a lot.
- The cooling system was disabled, the belt to the pump was removed.
- The is a noticeable lash in the vertical spindle.
The bottom of the casing is a reservoir for cutting/cooling fluid. It includes a mechanical pump that was stuck. I took it apart and cleaned it so it is fine now.
The lash was easy to get rid of by adjusting the spindle bearings.
The slip was caused by a nylon collet with worn threads. This collet transfer power to the vertical head. I just turned it down so it fits in an ordinary collet and it works great. In case the grip will decrease with time I'll make this part of brass instead. I'm sure there is a reason why it is made of nylon so I didn't want to make one in steel.
The turnable vise needs to be disassembled, cleaned and lubed before it is used.
Some pictures and finally a movie where it can be seen that it runs fine and straight now. The vertical spindle head needs a paint job.
[video=youtube;CcrShrJ9ID4]https://www.youtube.com/watch?v=CcrShrJ9ID4&feature=youtu.be[/video]