Hi,
I have the Warco MiniMill.
What follows is an honest description of what I have found on my mill. It has to be said that whilst some of the problems do appear to be common to this series of mills, indeed I do wonder if they may be common to Chinese machines full stop, I have to admit that I could just have a bad one. Somehow I do not think so!
I bought this mill because I felt that it was a weight that I could physically handle (clean forgetting that I could dismantle it), because it has the 3MT headstock which matched my lathe, and because it has a square column thus avoiding the loss of registration which can occur with round column mills.
Although this is not a Sieg X2, it is of a similar design and has at least one of the X2 known problems: plastic gear breakages. Fortunately Arc Euro Trade do replacement metal gears (look under C3 lathe spares). Alternatively, you could fit a belt drive as some people have. The other known X2 problem, that of electronic board failure may not apply as this mill has an uprated motor as against the original X2, hence I assume it has an uprated electronic board – at least mine hasn’t yet failed. Since buying mine, I have become aware that there are at least two versions of the electronic board.
In terms of sliding surface finish and accuracy, my machine leaves a lot to be desired. To be blunt, I think it has been a Chinese confidence trick as all the easily visible sliding surfaces, column, saddle and underneath the table are very nicely finished and smooth. However, the matching surfaces of the moving parts have been finished off with an angle grinder. These surfaces cannot be seen unless the machine is dismantled.
The table on my machine is warped. Actually, I think it is not so much warped as been ground wrongly as as far as I can tell both the table and the dovetails underneath are concave. I have not yet been able to check the saddle or column. I have a friend with the same mill and as far as I can tell, he also has warping but nowhere near as bad as mine. Regrinding will cost in the region of £80.
Main bearings grease was just about dried out, as were those on a friends MiniMill. Also some people don’t like the factory bearings and replace them with better quality ones.
The return spring idea is not very good which is why certain people with the same or similar mills have replaced it with a gas strut. Apparently one from a small Peugeot car is ideal. Also, one advantage of fitting a gas strut is that it allows for a slight increase in operating height, but it does then need the rack extending.
Apparently as well, the column is thought to be weak. Some people have stiffened it by adding various bits of metal. A trawl around the internet should reveal some of the ideas.
I, and I know other people have also done this, have now embarked on an exercise to improve the mill by correcting all the known deficiencies. In my case this is likely to be a long, long exercise.
Hope this helps.
Peter G. Shaw