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Post by mohs on Apr 8, 2014 13:30:55 GMT -5
rob I would roll with it!
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gemfeller
Cave Dweller
Member since June 2011
Posts: 4,025
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Post by gemfeller on Apr 8, 2014 13:40:01 GMT -5
Garnet hardness is generally in the 6.5 to 7.5 range, probably more toward the lower number. Most agates and jaspers run well over 7 in hardness. Carborundum grits are in the 9+ range. I don't see how garnet sand would be much help unless you're tumbling soft materials under 6 Mohs. But it's been a long time since I tumbled stones from rough; maybe I'm missing something here.
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Post by mohs on Apr 8, 2014 13:43:21 GMT -5
darn mohs again
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fixfireleo
starting to shine!
Member since March 2014
Posts: 30
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Post by fixfireleo on Apr 9, 2014 12:27:48 GMT -5
ahh. ok. that sucks. so, any ideas on where to buy the good stuff rather than from a rock shop and paying to have it shipped? it seems like some machine shop or other should be using this stuff that i could buy a little off of them.
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Post by 150FromFundy on Apr 9, 2014 16:43:13 GMT -5
If you are in a city, look for an industrial supplier, as RTHers are not the only users of grit. If you find one, chances are the smallest container will be a 5-gallon bucket load. Google search the nearest city + "industrial abrasives" and see what pops up. You need silicon carbide (SC) or something with a similar hardness.
If you can't find a supplier, do you have a industrial user that would sell you some of their supply?
Do you have a local or regional rock club that does bulk orders for their members?
Cheap grit is tough to find. It's really heavy to ship. Even if you find a cheap source, but have to rive 50 or 100 miles to get to it, it isn't so cheap anymore when you factor in time and gas.
Darryl.
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fixfireleo
starting to shine!
Member since March 2014
Posts: 30
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Post by fixfireleo on Apr 10, 2014 18:54:45 GMT -5
yeah. i live in columbus ohio so i was hoping to find an industrial supplier. on another note, went to flint ridge today and got about 2/3 of a 5 gallon bucket of flint. also finally found my way to heat it. bought a roaster off CL for $20. i have to clean the flint INDOORS using oxalic acid, so i'm hoping that doesnt go bad but we'll see. the directions indicated if i was cooking the rocks to clean them, the acid would work in about 6 hours rather than 2-3 days leaving soak outside in a bucket in the sun. if i never post again, you will know this was a bad idea. :/
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Post by pauls on Apr 11, 2014 3:17:48 GMT -5
That Garnet is from the Harts ranges just north of Alice Springs in Central Australia. I have tried tumbling large pieces of it and it is quite soft, if you don't watch it carefully it just vanishes. It would probably be OK for tumbling castings etc to clean them up but not rocks.
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1nickthegreek
spending too much on rocks
Member since February 2014
Posts: 383
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Post by 1nickthegreek on Apr 11, 2014 8:47:34 GMT -5
I just bought a big batch of grit from this supplier on Amazon. abrasives Great pricing and very reasonable shipping!!! Seems to be fantastic grit so far, it's grinding like mad for me!!! I have a ten pound jug of 90 grit that I am willing to part with at my cost + shipping, PM if interested.
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Post by Jugglerguy on Apr 11, 2014 8:54:42 GMT -5
Kingsley North has 80 grit on sale: 80 gritI bought 90 lbs.
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1nickthegreek
spending too much on rocks
Member since February 2014
Posts: 383
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Post by 1nickthegreek on Apr 11, 2014 9:05:51 GMT -5
Just a recommendation fixfireleo I have seen too many warnings about not using 60/90 in a vibe, guess you will go check one day and have a slurry pool on the floor and all around the vibe when it eats a hole through the bowl, so be careful.
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blessed
spending too much on rocks
Member since January 2010
Posts: 329
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Post by blessed on Apr 11, 2014 9:41:52 GMT -5
I though about cheaper grit once. Done some checking around. Found a industrial supplier who would sell to me. The problem was the minimum order. It was 300 pounds.
James
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fixfireleo
starting to shine!
Member since March 2014
Posts: 30
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Post by fixfireleo on Apr 11, 2014 11:28:01 GMT -5
good info guys. i have 5 pounds of each grit for my rotary and 1 pound each grit for my vibratory that i got from rocks4u.com. i think i'm going to use the rotary to for the rough/medium tumble and then the vib to polish. when i talked to the guy at rocks4u, he told me that the 3/4 cup of grit the manufacturer recommends for the vibe is way more than necessary. he told me he sprinkles it on until it's coated which is usually like 1 tablespoon....is this right?
ps. i got the 5 pound kit for $99. (5 pounds each grit for rotary). is that a good deal? i had to pay shipping on top of that.
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gemfeller
Cave Dweller
Member since June 2011
Posts: 4,025
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Post by gemfeller on Apr 11, 2014 11:57:56 GMT -5
when i talked to the guy at rocks4u, he told me that the 3/4 cup of grit the manufacturer recommends for the vibe is way more than necessary. he told me he sprinkles it on until it's coated which is usually like 1 tablespoon....is this right?
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Post by Jugglerguy on Apr 11, 2014 12:54:42 GMT -5
In my 4.5 lb Lot-O I use 2 tablespoon of 220, then 1/2 teaspoon of everything after that. In my 6 lb. rotary, I use at least 6 tablespoons of 60/90 or 80.
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1nickthegreek
spending too much on rocks
Member since February 2014
Posts: 383
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Post by 1nickthegreek on Apr 11, 2014 12:54:45 GMT -5
Another one that I have ordered from several times, their grit is graded and works so well, and 20.00 for 10 pounds of 220 is real good IMO Jesco, good service and shipping isnt bad from them either.
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fixfireleo
starting to shine!
Member since March 2014
Posts: 30
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Post by fixfireleo on Apr 12, 2014 11:04:16 GMT -5
i'll check out those 2 companies. iaccording to the directions, i use 1 cup grit in my 12 pound rotary and 3/4 cup grit in the 10 pound vibe. i might have to start cutting back on both.
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1nickthegreek
spending too much on rocks
Member since February 2014
Posts: 383
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Post by 1nickthegreek on Apr 16, 2014 3:16:56 GMT -5
i'll check out those 2 companies. iaccording to the directions, i use 1 cup grit in my 12 pound rotary and 3/4 cup grit in the 10 pound vibe. i might have to start cutting back on both. Definitely, I am running a 6 lb single drum and two dual drum three pounder's for a total of 18 pounds rough running nonstop, along with my 5 pound vibe and use maybe a cup a week of grit. I just do as Randy instructs in this thread for the vibe and pout it in until rocks are all coated. forum.rocktumblinghobby.com/post/337618/thread
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fixfireleo
starting to shine!
Member since March 2014
Posts: 30
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Post by fixfireleo on Apr 16, 2014 15:10:00 GMT -5
that's cool. this time, in the vibe...i put the rocks in wet after washing off step 1. i sprinkled less than 1/4 cup grit over the wet rocks and didnt put all of the scoop in, so maybe 1/6 cup? the rocks coated and i didnt need to add anymore water and today is about 24 hours and still doesnt need any water.
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Apr 17, 2014 21:47:37 GMT -5
I think your link is not working
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Post by Jugglerguy on Apr 17, 2014 22:07:04 GMT -5
Thanks, I fixed it.
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