jamesp
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Post by jamesp on Jan 29, 2017 9:24:31 GMT -5
The diamonds will be from diamond impregnated diamond pads. So bound in rubber. Cheapest price found was $1.60 per 50 grit pad in 50 QTY on Ebay. 30 carats of diamond per pad. 50 grit pad, backside with velcro ground off. Best if could be purchase without backing. 50 grit pad, cutting face up close. 10 strokes at about 4 pounds force(dry). Cuts fast and deep on clear quartz. Lack of grinding force in tumble may be a problem. Single 50 grit diamond: Pad cut into pieces for use in rotary tumbler. Will start with about one pad per pound of rock. Guessing they can be reused several times. Maybe many. May time release.
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Post by captbob on Jan 29, 2017 9:37:00 GMT -5
*sigh*
You think there will be enough action a tumbler to expose new diamond?
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jamesp
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Post by jamesp on Jan 29, 2017 10:03:39 GMT -5
*sigh* You think there will be enough action a tumbler to expose new diamond? No idea Bob. I can scratch the pad with my fingernail over a sheet of white paper and a few diamonds would come loose. I know the 50 grit pads will slap eat rock at 3000 RPM. Tumbler a way slower situation with less grinding force. But many many cycles. That pad grabs on to and abrades anything it touches with little force though. Some real sharp diamonds. You could trash a car windshield in two minutes by rubbing it with the pad for example. I will cut up 6 pads and throw them in the 7 pound rotary with straight water and hope for a muddy slurry the next day. 10 years ago 50 grit pads cost $10 each. $1.60 each is a game changer.
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Post by orrum on Jan 29, 2017 11:56:37 GMT -5
Hey that's a great idea and I think it will work!
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Deleted
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Post by Deleted on Jan 29, 2017 12:02:21 GMT -5
Are you seperating out each segment?
Scroll saw makes fast work of that. Been doing that to make those work on sphere cups. In wedges dor me segmentsfor you.
Will be patiently watching for happiness.
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Post by MrMike on Jan 29, 2017 12:14:14 GMT -5
Will be watching this to see how it turns out. Are you planning to filter slurry to recover diamonds released from the pads? Wonder if the pads will have too much of a cushioning effect? So overall you have 0.66 lbs of 50 grit diamond. Strange you can get the pads with 30 carats so much cheaper than you buy the diamonds alone.
You think about extracting the diamonds from the pads? Burning would be nasty but you could try pyrolysis. Played around with this when I went through a precious metal recovery from PCs phase. Put the pads in a pretty airtight metal container then put in fire or on grill. End up with ash.
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Post by HankRocks on Jan 29, 2017 12:35:50 GMT -5
Here's a wild idea, why not glue strips or patches of the Diamond Pad to the inside of the Tumbler Barrel. Kind of a reverse wheel. I suppose they would eventually wear out and now you have to get them off the barrel. It might also make cleaning the barrel out a bit more difficult. It might be easier to do this with any large homemade barrels, it might also slow down the wear on the barrel itself.
H
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Post by captbob on Jan 29, 2017 12:51:37 GMT -5
I like the way you think Henry!
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jamesp
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Post by jamesp on Jan 29, 2017 13:36:51 GMT -5
Hey that's a great idea and I think it will work! Lets hope so Bill. Would be nice to speed up the cutting on step 1. Been learning about diamond cutting wheels and pads. The diamonds vary a whole bunch in sharpness. Apparently in orientation too. I bought a tuck wheel. It is a diamond wheel for removing mortar. 1/4 inch thick. 1/2 inch on sides. The 1/4 face cuts like a piranha, the 1/2 inch face is way less aggressive. Apparently they orient the diamonds or the matrix somehow. Well, these little diamond pads are oriented aggressive with very sharp diamonds. sharp = low pressure low pressure is key if the rotary is going to cut your rocks. Hope they work.
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jamesp
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Post by jamesp on Jan 29, 2017 13:53:41 GMT -5
Will be watching this to see how it turns out. Are you planning to filter slurry to recover diamonds released from the pads? Wonder if the pads will have too much of a cushioning effect? So overall you have 0.66 lbs of 50 grit diamond. Strange you can get the pads with 30 carats so much cheaper than you buy the diamonds alone. You think about extracting the diamonds from the pads? Burning would be nasty but you could try pyrolysis. Played around with this when I went through a precious metal recovery from PCs phase. Put the pads in a pretty airtight metal container then put in fire or on grill. End up with ash. Mike, I will see how they do bound first. I don't think the diamonds are going to get dull, but I do think they will be jarred out of the rubber. And then you have to ask at what rate the rubber will wear. Rubber defends against abrasion very well. The impacts in the barrel may cause other problems. Not sure. As far as scavenging and recovering, let's see how fast the rubber releases them first. Diamonds take severe abuse, not brittle. Doubt the tumbler can crack them like SiC. If 6 pads last say five or ten loads of 7 pound barrels you should be beating the cost of SiC a lot. And reducing clean outs and grit additions. That would be best case. And what size to cut the pads to ?
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jamesp
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Post by jamesp on Jan 29, 2017 13:57:14 GMT -5
Are you seperating out each segment? Scroll saw makes fast work of that. Been doing that to make those work on sphere cups. In wedges dor me segmentsfor you. Will be patiently watching for happiness. I just cut them to the last photo Scott. Using scissors. You can feel the scissors hitting diamonds. the 'connective tissue' has diamond bound in it too. is 50 grit the coarsest you have found ?
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jamesp
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Post by jamesp on Jan 29, 2017 14:09:35 GMT -5
Here's a wild idea, why not glue strips or patches of the Diamond Pad to the inside of the Tumbler Barrel. Kind of a reverse wheel. I suppose they would eventually wear out and now you have to get them off the barrel. It might also make cleaning the barrel out a bit more difficult. It might be easier to do this with any large homemade barrels, it might also slow down the wear on the barrel itself. H I sure would like to see an open bowl turned at an angle and rotating about one rotation per 2 seconds. With these pads stuck to the bottom of it somehow. Where the bowl holds some water to wet the tumbles and the pads. Tilted and spinning fast enough to slip on the rocks and tumble the rocks in a slow standing wave. Have the tilt angle adjustable to get slippage on the rocks. Make sense ? A rotary does not, or should not have much slippage between the rocks and the barrel. Especially octagon barrels. I have seen tire tumblers that have bigger diameters and the rocks go up the hill and roll back down constantly. Slipping a lot at the same time. You may be able to vulcanize these pads to the inside of a tire easily. Tire will hold water. you can inflate a beach ball in the opening of the tire to seal it on both sides. Do you get this MrMike ?
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Deleted
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Post by Deleted on Jan 29, 2017 14:28:14 GMT -5
Are you seperating out each segment? Scroll saw makes fast work of that. Been doing that to make those work on sphere cups. In wedges dor me segmentsfor you. Will be patiently watching for happiness. I just cut them to the last photo Scott. Using scissors. You can feel the scissors hitting diamonds. the 'connective tissue' has diamond bound in it too. is 50 grit the coarsest you have found ? Yes and sadly in your barrel the best they can do is cut like 100 grit because half or less of the particle is not exposed.
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jamesp
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Post by jamesp on Jan 29, 2017 14:28:48 GMT -5
The manufacturer probably uses the lowest grade crushed diamonds in these pads. No matter, diamond's a diamond. Will cut Mohs 7 like butter and not get dull even if sharp. Has to be using low grade to sell at $1.60 per 30 carats. Fine industrial diamonds can easily sell for $1 per carat. Much more in some cases.
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jamesp
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Post by jamesp on Jan 29, 2017 14:31:46 GMT -5
I just cut them to the last photo Scott. Using scissors. You can feel the scissors hitting diamonds. the 'connective tissue' has diamond bound in it too. is 50 grit the coarsest you have found ? Yes and sadly in your barrel the best they can do is cut like 100 grit because half or less of the particle is not exposed. So true. No matter, I doubt SiC is going to cut any deeper than 1/2 a particle because of the low pressing forces. Know what I mean ? probably does not cut at 1/8 of a particle at such low pressures in a rotary.
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Post by Deleted on Jan 29, 2017 14:46:29 GMT -5
Yes and sadly in your barrel the best they can do is cut like 100 grit because half or less of the particle is not exposed. So true. No matter, I doubt SiC is going to cut any deeper than 1/2 a particle because of the low pressing forces. Know what I mean ? probably does not cut at 1/8 of a particle at such low pressures in a rotary. Pressures not as low with the potato sized grinder stone present. But, of course, low pressures means smaller cutting action.
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jamesp
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Post by jamesp on Jan 29, 2017 15:28:23 GMT -5
So true. No matter, I doubt SiC is going to cut any deeper than 1/2 a particle because of the low pressing forces. Know what I mean ? probably does not cut at 1/8 of a particle at such low pressures in a rotary. Pressures not as low with the potato sized grinder stone present. But, of course, low pressures means smaller cutting action. Pretty darn sure Mr Potato stone will get these pads to cutting. Will do first try with regular 1 to 2 inch tumbles. If no muddy slurry starts then the potato gets tossed in.
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Deleted
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Post by Deleted on Jan 29, 2017 22:55:39 GMT -5
I'm so envious of your free time!!
Thanks for gratiously sharing.
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Post by spiceman on Jan 29, 2017 23:35:30 GMT -5
Just thinking. The rubber part part of the pads may get in the way. I don't know, soak them in acetone a the rubber and diamonds may separate. Acetone may not affect that rubber so something else may need to be used... Xylene?
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jamesp
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Post by jamesp on Jan 29, 2017 23:39:11 GMT -5
I'm so envious of your free time!! Thanks for gratiously sharing. It comes and goes. Glad to amuse.
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