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Mirror finish on aluminum
Mirror finish on aluminum
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Old 24th November 2020, 03:48 PM   #11
454Casull is offline 454Casull  Canada
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Meguiar's makes their Unigrit sheet abrasive up to 3000 grit, and 3M Trizact products go past 3000. Try those if you are really having trouble with getting a fine sanded finish, and make sure you end with a suitable aluminum polish.

Someone else has mentioned to clean the surface between grits. That's important too, along with making sure the scratches from the previous grit are completely (COMPLETELY) gone before moving to the next finer grit.
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Old 24th November 2020, 04:06 PM   #12
anchorman is offline anchorman
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There is a reason why nearly everything in the world has a directional scratch pattern to it. You can scratch “polished” stainless steel almost from looking at it. Extremely frustrating work. When doing it for a living we discovered that it took 10x the effort, but customers only wanted to pay 2x what it cost to do a nice directional or semi-random scratch pattern. It did not take long as a student before I refused to entertain highly polished surfaces just as the master had done years before. Occasionally they’re called for but outside of rare circumstances they’re a fool’s errand. Electropolishing might be an option, though I don’t know how/whether it works for aluminum.

Can you chrome plate aluminum? I have not looked into this. It would surely be more durable and long lasting than polished raw aluminum.
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Old 29th November 2020, 01:31 PM   #13
johnmarkp is offline johnmarkp  United States
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A mirror finish means that the surface must be mirror flat. I learned this the hard way and ended up going back to a 220 grit finish using an orbital sander.
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Old 2nd December 2020, 01:38 PM   #14
rock12 is offline rock12  United States
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Thank you all for the time and advise! I finalized with what I call controlled scratching my water here is hard and I found some minerals must get thru and can wreak havoc Here are some pics
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Old 2nd December 2020, 03:51 PM   #15
wiseoldtech is offline wiseoldtech  United States
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Nice work, rock12.
However, if that octal tube is a rectifier, why is it so near the input tubes?
I would have mounted it closer to the PT, with the PT mounted in line with the OTs.
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