jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 6, 2014 10:16:58 GMT -5
At 50 cents a pound. At the industrial junkyard. Old cast lead holes. Back in a cranny. About 200 pounds of them. East to crush. They are 5 inches X 1 inch wide. Will they work, guessing yes.
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Post by iant on Dec 6, 2014 15:25:07 GMT -5
No reason why that shouldn't work! Great find!
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 6, 2014 16:34:35 GMT -5
No reason why that shouldn't work! Great find! I had found loose abrasives at that yard before, a 5 gallon bucket of AO 220 that has that tumble step covered. Two shelves full of new and used grinding wheels. Recently noticed the SiC ones, most common is AO. They are bonded lower grade SiC, many flat particles that would not pass a 60 screen. Some 20-30 mixed in. No problem for grinding wheels and rough tumble. Would not be surprised to find a bucket of diamond powder at that place.
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Post by Pat on Dec 6, 2014 20:18:06 GMT -5
I've always loved "shopping" at old garbage dumps. Good way to spend an afternoon.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 6, 2014 21:18:45 GMT -5
I've always loved "shopping" at old garbage dumps. Good way to spend an afternoon. Garbage 101 should be a college course. At least recycling.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 7, 2014 14:16:41 GMT -5
After a day in the rhyolite, the chunks of the grinding wheel have rounded off. Looks like the chunks may last 3-4 days. Then I suppose they have to run long enough to break down the center particles that were hiding from the abuse. I can say the rhyolite is roughing very fast, which may be normal in any coarse grit arrangement, never having run rhyolite. Do I see red and blue corundum particles in this stuff ? These wheels were made at least 30 years ago, or at least that's when the manufacturer went out of business. Curios if some SiC is better than others.
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Post by broseph82 on Dec 7, 2014 22:30:03 GMT -5
How can you tell what grit the wheels are without a label? I bought a machine with SiC wheels and have no clue what they are but would love to use them for tumbling.
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quartz
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breakin' rocks in the hot sun
Member since February 2010
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Post by quartz on Dec 7, 2014 23:22:29 GMT -5
Good recycle at the right price. Are the chunks breaking down to grit particles?
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 8, 2014 6:08:26 GMT -5
How can you tell what grit the wheels are without a label? I bought a machine with SiC wheels and have no clue what they are but would love to use them for tumbling. They had labels Jimi. I removed them before crushing them. That wheel says 60 grit. But it has plenty of 30 grit particles in it. Since I use a lot of SiC 30/60, I am used to looking at 30 grit particles. If the particles on your wheels are bigger than salt crystals they should be coarse enough for coarse grinding. Most grinding wheels are coarse/medium/fine=60/220/500 in most cases. You will have no trouble telling a 60 wheel from a 220 wheel(coarse from a medium), you can compare them at Home Depot. No problem at all.
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jamesp
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Member since October 2012
Posts: 36,158
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Post by jamesp on Dec 8, 2014 6:25:33 GMT -5
Good recycle at the right price. Are the chunks breaking down to grit particles? The last photo above is a piece that was tumbling for a day, it has rounded. So yes. I don't know what size they are today after 48 hours. I would guess a good procedure would be to break them up and screen the powder, then the chunks. Use the powder as normal tumbling grit. And treat the chunks like rocks when you do a clean out for the next grit recharge, leaving them in. But when a clean out is done, I would save the heavy particles by letting them settle in the clean out pan and reusing them. Because the chunks would delay the wear on the SiC on the inside of them. So definitely keep the grit particles that settle out. May be easier to crush the whole thing to powder. But I am curious what those SiC asteroids are going to grind like either rhyolite is very soft or those chunks are very effective
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Jan 1, 2015 15:33:25 GMT -5
Really like these grinding wheels. They do coarse grind in the rotary well. Started with 2 cups in 15 pounds of rock, add about a half cup every week or so. They last about 2 weeks, releasing fresh grit like a time release. Grind rate similar to 30/60 SiC., maybe slightly better. Typical charge for 15 pound barrel, wheel is 5 inches Coral, rhyolite mix, 15 pounds. Most pre-rounded, these at 3 weeks
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matt2432
starting to spend too much on rocks
Member since December 2014
Posts: 171
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Post by matt2432 on Jan 1, 2015 16:14:01 GMT -5
Awesome find. It's always a great feeling taking something that would have been trash and putting it to good use.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on Jan 1, 2015 16:21:54 GMT -5
Awesome find. It's always a great feeling taking something that would have been trash and putting it to good use. Saved a bunch of money too Matt !
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