Sandblaster. By Make Stuff With Little Devil. 5:19 video:
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
This guy has a death wish, grinding aluminium on a grind stone? I try not to be too negative but his idea goes no further than being something not worth trying. A sand blaster eats most materials, including the tube it is blasted through, hence the use of very hard steels or preferably ceramic or polyeurothane.
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