Why would you buy that for doing rotor blocks? rotor blocks are easy to do with a hand drill... :E
If you are going to make a block you have to design the block around the tools you have available. Do your designs first and see what you are able to do with the tools before you buy them.
Ive never used a dremel-drill press thing before but it looks compleatly aluminuim, which isnt good. However it will be better than a dremel by hand, I expect - as atleast you know the drill is vertical and not at an angle which happens when you do by hand. Also a dremmel can cope with side-loads (i think) which a drill press cannot, or it wont last long, iirc.
You could mill with that *thing* but you would also need a proper vice - holding the copper by hand could be very bad for your hand :E
You would have to do it in very small passes taking off only tiny layers of copper at a time but its possible.
Remember someone on here milled copper with a plastic toy drill/mill thing inteneded for woodwork.
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