Breaking Down Abrasives

Thanks for sharing this!

This shows that slurry viscosity and grit surface area have a definite effect on grinding efficiency.

I like this one best!

Interesting article and it confirms what I've read with not using coarser than 80 in a 3 lb barrel.
I just wonder if anyone has done a similar test with a 12 lb barrel ?
Guess I have to search the archives.

Thanks for posting the article.
Patty

Yes there was, sorry for carelessly posting pages. It has been fixed. Thank you so much. You're awesome.

I put the proper last page where it belongs

Thanks so much. I'm going to print this and give it thoughtful consideration.

I was wondering if sometimes slurry has too much viscosity. It seems a point of "supersaturation" (of grit and rock "mud") is reached and no additional wearing occurs.

Rob, It occurred to me that the grit will have a tendency to collide with itself under pressure from the rocks and break itself down. The more grit the more grit particle to grit particle collisions the less opportunities for grit to rock breakdown. So the extra grit does not help as it is wasted in these grit to grit collisions. It's also why the grit seemed to be all used up in all of barrels.

Also early in the run there is not as much slurry to help suspend the grit and it tends to stay "stacked"  on one side and the bottom increasing the grit to grit grinding. As the slurry thickens the grit will suspend better but still be subject to grit to grit contact.

Henry

So reading this article the author concludes that starting with 220 grit is more efficient than starting with 80 grit? Anybody tried this in the rotary? I might adjust to running rotary with 120/220 then going to vibe 500 than vibe 8000 polish.