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Well, this mainly depends on what your planning to make, how fast it needs to be done, and at what precision level your looking for. This may be the hardest but most important question to answer as you may not know what you plan to make. I know this was the hardest thing for me to figure out. Take a look at MY EXAMPLES for some of the things I have made on my Sherline mill/lathe. This should give you a general idea of what can be made on a machine of this size. Size is the limiting factor not complexity or precision. Personally, I am very happy with my mill and my website should show this. I did wish I had a larger cutting diameter on my lathe, and this can be done by installing the "riser blocks" which I have now done.  I do believe if you're wanting to cut larger parts then what you would see on a "90" size RC helicopter, mostly out of steel, or looking for production work, I would look at a larger heavier machine. If you stay within the capabilities of the machine it is very rewarding and the amount of accessories Sherline offers is incredible.

In General : If you go outside the limits of ANY machine it is going to be a disappointment.

Also remember, a larger machine will be more expensive to setup, maintain and move around. Keep cost, size, and additional accessories in the "buying factor." Buy a larger stronger machine if you think you will need it and can afford it. However, always remember, spending more now will save you in the end.

If your wanting to make, for example, side frames for RC helis (large flat pieces), chasses for RC car, a CNC ROUTER will be a better option with its larger cutting area. The mill will be useless in this case. I am in the "process" of adding this to my collection. A CNC router is not structurally as strong as a mill and you will not be able to produce larger 3D parts with it. Now what "larger" is depends on what you plan to make and the material it's made from. Again, back to the same question.

or Should I get a CNC Router

Should I  go Bigger?