The thing with Mills is the area taking up by the machine doesn't not impact you like buying a lathe or some other tools would. Yeah they can get heavy as you increase in size but there is a huge gulf between requiring riggers and a Sherline.
This is very true but the poster Indicated that he was well positioned with access to tools.
While retrofitting a big old cast-iron mill can be an interesting adventure, not everybody's equipped for that, and even if that's the ultimate goal, having a small machine can make the process of producing mounting plates, etc a lot easier.
This is a very important consideration but one has to realize that adding a high speed spindle is always an option and has been common practice in industry. On the other hand a Sherline is handicapped in reverse with its high speed spindle if work in steels is desired.
While the small Chinese mills need a lot of work before they can be used in CNC mode, and usually have slow spindles with plastic gears, the American-made machines like Taig and Sherline are easy to convert, with motor mounts, controllers and stepper motors supplied by the manufacturers. Their belt-drive spindles go up to 10,000 RPM, which make them effective tools for cutting aluminum.
More good points. I have nothing against Sherline, my only concern comes from previous experience buying to small. It is well worth the time to think hard about the wisdom of any specific tool.
But if you want a Sherline, I'd suggest the 5400 model over the 2000 for CNC use. The 2000 has a lot of tilts and adjustments which are handy for making odd-angled holes and slots, but those also make it less rigid and harder to tram, and those tilts aren't very useful in CNC mode.
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