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Post by toiv0 on Feb 12, 2017 6:01:34 GMT -5
Would agree that the Vibe will probably do better than the rotary as the rock will probably contact the diamond just a bit longer. During the contact instant it will probably move 2 or 3 times across the contact zone with the rock before moving on. Or at least that sounds good in theory! I am just happy with the use of Slurry. Just ran a load of Arkansas Quartz through 46/70 for 10 days, 3 re-charges with no plastic pellets. Almost no frosting. In the past with no slurry they would have had a decent amount of frosting even with the use of plastic pellets. I will use the pellets in the 220. Pellets and slurry should do well. H Slurry works. Makes rocks drag harder against each other. Can offer 100% protection. Padding with plastics impedes grind. Granted it offers padding but at a cost. The clay/kitty litter is great for coarse grind, but may have silica in it and impede polish. I always thickened the 220-500-14,000 steps with sugar in the finish steps of rotary. Switched to vibe for finish steps. Used too much sugar in rotary. Purchased sugar in 25 pound bags. I think when you have the diamonds in the pad you only have a portion of the diamond exposed where if was loose with 100 percent exposed it would be rubbing against 2 rocks at the same time. When you look at sand under a microscope it will have between 25 and 50 percent voids. where the sand (rocks) touch is where you have your grinding. If there is not abrasive touching where the rocks touch there is no removal of material. When you have the diamonds in matrix you dont have the two stones touching action. Don't really know how to explain and hope it makes sense.
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jamesp
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Post by jamesp on Feb 12, 2017 6:04:47 GMT -5
YES. Perfect. where are they ? Wonder if you could make 'em. Kinda like snowball Christmas cookies. Make your "ball" and roll 'em in diamond grit. (that oughta keep him busy for a couple hours!) Hunted Alibaba for diamond impregnated tumbling media of any shape. Odd that it could not be found in search. Most industrial tumblers tumble much softer metals. Diamonds may be overkill for such. Lapidary a different animal tumbling Mohs 7.
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jamesp
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Post by jamesp on Feb 12, 2017 6:19:09 GMT -5
Slurry works. Makes rocks drag harder against each other. Can offer 100% protection. Padding with plastics impedes grind. Granted it offers padding but at a cost. The clay/kitty litter is great for coarse grind, but may have silica in it and impede polish. I always thickened the 220-500-14,000 steps with sugar in the finish steps of rotary. Switched to vibe for finish steps. Used too much sugar in rotary. Purchased sugar in 25 pound bags. I think when you have the diamonds in the pad you only have a portion of the diamond exposed where if was loose with 100 percent exposed it would be rubbing against 2 rocks at the same time. When you look at sand under a microscope it will have between 25 and 50 percent voids. where the sand (rocks) touch is where you have your grinding. If there is not abrasive touching where the rocks touch there is no removal of material. When you have the diamonds in matrix you dont have the two stones touching action. Don't really know how to explain and hope it makes sense. Yes, a 10 grit diamond bound in matrix only has a portion of the diamond protruding Billy. It may take 10 grit diamonds bound in matrix to equal 46 grit running loose. No doubt a diamond held in matrix has less exposed 'cutting depth'. Pretty sure the problem with the 1/6 pads is lack of relative movement between rocks and pads in the rotary. After 4 days in the rotary the rocks are smooth. Very smooth. They should have a rough finish even if abraded by 80 grit, much less sharp 30 grit diamonds imbedded in matrix. Those diamond pads are doing 'zero' in the rotary. nada Rocks look like they are ready for 500 grit. Will move the experiment to the vibe today. Betting the vibe will create relative movement 'pads to rocks'.
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Deleted
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Post by Deleted on Feb 12, 2017 22:06:14 GMT -5
One cannot expect 30 grit pads to produce 30 grit cuts.
2/3 of the diamond or more is embedded in the pad. 220 seems about right.
The only question is "what is the Roki Factor?"
What weight of stome was removed?
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jamesp
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Post by jamesp on Feb 12, 2017 22:14:12 GMT -5
One cannot expect 30 grit pads to produce 30 grit cuts. 2/3 of the diamond or more is embedded in the pad. 220 seems about right. The only question is "what is the Roki Factor?" What weight of stome was removed? The pads aren't going to work in the rotary. You need loose particles for the rotary. Loose sharp diamonds will, but not pads. Maybe pads cut into small pieces. Loose grit will be hard to beat. Sharper the better. 100 grit pads cut deep when rubbed on glass or quartz, below photo. 30 grit deeper. Exposure of particle is not the problem. There is no rubbing in the rotary. The problem. End of story.
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Post by MrMike on Feb 19, 2017 6:46:40 GMT -5
Will unload barrel with diamond pads today. Wash the whole load well and put it in the vibe. Add a few polished tumbles. Turn it on and see how fast it removes the polish. Bet it won't take long. The polished rocks will tell quickly what the diamonds are doing to them. Status check?
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jamesp
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Post by jamesp on Feb 19, 2017 7:17:16 GMT -5
Will unload barrel with diamond pads today. Wash the whole load well and put it in the vibe. Add a few polished tumbles. Turn it on and see how fast it removes the polish. Bet it won't take long. The polished rocks will tell quickly what the diamonds are doing to them. Status check? Amazing. Little effect. Removed the polish off of the polished rocks and only after a full 24 hours. Muddied the clean water, material was removed. At 4 hours the polished rocks looked almost untouched. No visual scratches. Go figure Mike. BUT, the diamonds in those pads seem just as sharp after being in the vibe for 24 hours. My vibe will break down SiC 30 SiC 80 AO 22 AO 46 AO 80 to less than 220 in 12 hours. If the vibe can't break or dull the diamonds it is unlikely the rotary will. So the stage is likely set for diamonds lasting a long time in a vibe or a rotary. i.e., long term reusable if you can recover without loss.
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Post by orrum on Feb 19, 2017 8:24:50 GMT -5
Rock em sock em Jim! Didn't someone on here talk about the diamond brazing rods that they use to make lapidary stuff from? Take brazing rod and melt it over a vat of water and the droplets spinning make them round and rapid cooling keeps ball shape round. You know like they did with shot towers to make lead shot in the old days. Just thinking out loud....
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Post by MrMike on Feb 19, 2017 10:49:47 GMT -5
Amazing. Little effect. Removed the polish off of the polished rocks and only after a full 24 hours. Muddied the clean water, material was removed. At 4 hours the polished rocks looked almost untouched. No visual scratches. Go figure Mike. BUT, the diamonds in those pads seem just as sharp after being in the vibe for 24 hours. My vibe will break down SiC 30 SiC 80 AO 22 AO 46 AO 80 to less than 220 in 12 hours. If the vibe can't break or dull the diamonds it is unlikely the rotary will. So the stage is likely set for diamonds lasting a long time in a vibe or a rotary. i.e., long term reusable if you can recover without loss. You gonna remove them from the pads? Since they don't break down you wouldn't need as much as you do SiC, right? Rinse your rocks over the hopper so the diamonds always stay in the hopper.
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Deleted
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Post by Deleted on Feb 19, 2017 21:55:53 GMT -5
Diamonds sublimate into carbon dioxide at, i believe, 4500°F
Shopped alibaba hard for 35mesh sharp diamonds.
Said I would buy pallet quantity long term and need a one kilogram sample for testing. They want $350/kg plus silly freight cost. I have bought kilo boxes of tea and paid $4 for EMS postage, why do they want $60-$120 for grit?
Am eagerly watching your progress. No such thing as failure. Only learning. Keep after it amigo!
ETA
I have 8 quotes al similar
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jamesp
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Post by jamesp on Feb 20, 2017 9:39:09 GMT -5
Diamonds sublimate into carbon dioxide at, i believe, 4500°F Shopped alibaba hard for 35mesh sharp diamonds. Said I would buy pallet quantity long term and need a one kilogram sample for testing. They want $350/kg plus silly freight cost. I have bought kilo boxes of tea and paid $4 for EMS postage, why do they want $60-$120 for grit? Am eagerly watching your progress. No such thing as failure. Only learning. Keep after it amigo! ETA I have 8 quotes al similar Wish I could find a bucket of them at the industrial junk yard. About 2 cups of 10-20-30 sharps would be enough for testing. 10 grit is on the too coarse side but would be easier to recapture at clean out. You can not do a clean out till the end of coarse run. Just pour fresh water in the top of the barrel and pour off several times till the slurry thins out. At SG 3.4 SiC quickly settles to bottom. Diamonds are SG 3.5 and would do the same. Seperation is very doable. 2 cups would be plenty for a 15 pound rotary. Use 1.25 cups, loose some along the way at final clean out. Maybe 2 cups would last 2 dozen coarse grinds or more in a 15 pound barrel. maybe 10 time that, who knows.
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