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Originally Posted by Onlypro
This may be superficial, but, using aluminum in DIY blocks usually, is asking for trouble. Aluminum doesnt mix well with many other metals such as copper, especially when it isnt anodized. Sure, there are ways of preventing the degredation resulting from electrolysis...
If you are making a rotor, don't go out of the way to make it aluminum.
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Not if all other part in your system are also Aluminum or plastic.
Aluminum is cheaper and much easier to machine. If someone is just starting out building blocks, or anything else, aluminum is definitely the way to go.
The fact that it's easier to machine is one benfit to the newbie for obveous reasons. And since there will be lots of mistakes made at first, the fact that it's cheaper is another benafit.