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Joined: 30 November 2016
Posts: 6
08 October 2020 09:54 pm

Hi. The instruction book that came with my new Lortone tumbler recommends 7 days use of aluminium oxide after 220 grit and then a final 7 day polish using aluminium oxide. I have used 600 grit for years before polishing. What do people think? Your advice is appreciated. Regards, Old Bull Hubbard.


From: Newcastle NSW
Joined: 28 May 2015
Posts: 421
09 October 2020 06:58 pm

I always used 600 grit before the final polish and if that's what you have been doing keep doing it, it sets the material up for a good finish. However, I add that I never used aluminium oxide, only used silicon carbide. If you have some material that is something that you might be prepared to take a risk with, try an experiment.


From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 1,519
10 October 2020 10:00 am

Think it depends on the material your tumbling, I use Silicone Carbide 600 as i don't have any Aluminium oxide. Aluminium oxide is not as hard a carbide therefore less aggressive so may be better for softer stones and will not take off as much material.