junglejim
spending too much on rocks
Member since January 2014
Posts: 344
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Post by junglejim on Feb 11, 2015 10:29:34 GMT -5
Two of my Harbor Freight specials shot craps in the same week after about six months of use. Funny how the first one that I bought over a year ago is still running fine and never has even broken a belt. Didn't want to go that route anymore so bought a Thumler AR-12 today. It's supposed to be heavy duty and I was wondering what the coarsest grit I could use in it without tearing it up. I have some 60/90 but think I could use a coarser grit. What would you suggest ?
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tkvancil
fully equipped rock polisher
Member since September 2011
Posts: 1,547
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Post by tkvancil on Feb 11, 2015 10:42:40 GMT -5
You should be able to use as coarse a grit as you like. Just consider the fact that the coarser the grit the faster the barrel wears. In any case that tumbler is going to give you a lot of service.
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Post by captbob on Feb 11, 2015 10:48:02 GMT -5
As Ken said, coarser grit = faster wear. Do as you wish, but I would stick to 60/90 for coarse.
Enjoy your new ar-12! Love mine, it's such a quiet tumbler. I use my Model B barrels for coarse and the 12 for finer grits & polish.
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Post by deb193redux on Feb 11, 2015 11:38:25 GMT -5
I used some 46/70 because it was given to me. It ends up being harder to get mud started because it is heavier and does not suspend as easy. I did not notice much time savings.
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Post by Jugglerguy on Feb 11, 2015 17:03:30 GMT -5
I've always read that 120/220 is as coarse as you should go with a vibe. That's what my Lot-O directions say.
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Post by captbob on Feb 11, 2015 17:07:15 GMT -5
Thumler's ar-12
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Post by Jugglerguy on Feb 11, 2015 18:11:13 GMT -5
Oops, I thought that was the thumlers vibe. Everything makes a lot more sense now!
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Feb 12, 2015 0:24:45 GMT -5
I run an octagon homemader very near the same size as your '12. I've found anything more coarse than 80 grit, equal enough to 60/90, doesn't "use up" well, takes a long time no matter the size of material in it. 80 works well.
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