On 16/10/2020 22:45, The Natural Philosopher wrote:
On 16/10/2020 19:16, thescullster wrote:
Hi Guys

I am profiling a bracket shape out of 12 thk aluminium.

Got as far as the rough profile with a jig saw and a bit of chain
Â* drilling and will dress it to shape with a file next.
The question is, how do I get a decent finish on this?
The edges will need tidying as will some scratches that were
Â* already present in the metal surface.

Is this a job for ever increasing grit sand paper?

yes

How do I achieve a polished finish if that isn't asking the obvious?
Wver increasing grit sand* paper?
Followed by a buffing wheel and cutting/polishing compound

*wet and dry, used wet.

It won't stay shiny long though. Not aluminium. Always ends up looking
dull and slightly oxidated.

It will be fine if you lacquer it or it is in a nice dry environment.
Humidity and alkalis are the enemy of aluminium metal.

Its weak point will be the screws/bolts since dissimilar metals in
contact also leads to corrosion problems.

Anodising will work but not for a mirror finish. Not really DIY either.

--
Regards,
Martin Brown