Check out Rocktumbler.com. They recommend 2 Tbsp per pound of material for nearly every recipe! I usually only burnish for an hour. Do you think it makes a big difference to do it much longer? I dont generally have unused grit left over in the Nat Geo 3 Lb tumblers. I use 4 Tbsp in the 3 lb Lortone tumblers (per manufacturer instructions) and it happens in those barrels ocassionally. They don't actually hold 3 lbs of material - more like half of that. Sort of misleading on their part.
As of now, my preferred tumblers are the ones that I can afford and are available 🤣🤣.
But seriously, I don't really have a preference. I own three Koolstone Brushless Tumblers with one 3lb barrel. They are not 3lb barrels. I checked them and they are a bit larger more like a 4 or 5 lb barrel.
This is the model that I have:
I also have 4 Harbor Frieght tumblers with two 3lb barrels.
This is that model:
They are both pretty good for the cost. A lot of people complain about the Harbor Freight tumbler and say that it is junk, but I modified mine before I started using them and have had zero problems with them. And two of the units have been running non-stop for over 6 months. The other two units I got later, and they have been running for about 4 months. No problems at all.
The Koolstone brand has multiple speeds like the Nat Geo, but I only use speed 1. I never use the other two speeds as they are too fast. On speed 1, those type of tumblers run around 80-90rpm while the more traditional tumblers like Harbor Freight, Lortone, etc run around 40-50 rpm.
I kind of want to get a Highland Park two 3lb tumbler. But then I keep thinking to myself, is it really that much better than the Harbor Freight model to justify the costl. The Highland Park is about $170 and the Harbor Freight is $70 (but you can frequently catch them on sale for $60). You can basically get three Harbor Freight tumblers for the same price as a Highland Park or Lortone brand.
Check out Rocktumbler.com. They recommend 2 Tbsp per pound of material for nearly every recipe! I usually only burnish for an hour. Do you think it makes a big difference to do it much longer? I dont generally have unused grit left over in the Nat Geo 3 Lb tumblers. I use 4 Tbsp in the 3 lb Lortone tumblers (per manufacturer instructions) and it happens in those barrels ocassionally. They don't actually hold 3 lbs of material - more like half of that. Sort of misleading on their part.