I have some .625" diameter aluminum bar stock that I need to do some kind of surface finish/treatment to.
The stock has fine longitudinal striations (I'm guessing from being extruded) that I would like to eliminate or at least reduce. I don't need a superfine or polished finish- I just want to get rid of the "unfinished" look. A fine, brushed finish would be perfectly acceptable.
Now, here's the problem. I only have access to typical homeowner tools and no way to secure the stock in a fixture other than my own hands. I have a big vise but can't use it because the jaws will mar the stock. I do have a good bench grinder but I think it'll be way too aggressive. I also have a belt sander and a random orbit finishing sander that might work. What do you think? And what type of abrasive /grits should I look for?