jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 25, 2017 11:07:54 GMT -5
I tried it. For 24 hours on the near sphere. notjustone, I did see the big chunks of SiC, even the 1 pound sphere did not crush it at 55 RPM. fresh off the grinder yesterday 24 hours later today. Bad photo but grind marks are disappearing. Certainly grinds.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 25, 2017 18:18:19 GMT -5
at a 7 day cleanout my slurry doesn't feel gritty at all. so most of it does break down i would say less than 5 percent (the biggest of the chunks) are still there but settled near the bottom.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 25, 2017 20:10:22 GMT -5
at a 7 day cleanout my slurry doesn't feel gritty at all. so most of it does break down i would say less than 5 percent (the biggest of the chunks) are still there but settled near the bottom. Yes, a small portion of the big pieces were left. Could be saved and bopped with a hammer. No doubt it cuts. I'd use it in a minute. Bet the price is way cheaper. Like 80%. If adding on 2 day intervals it should be constantly cutting as a good bit of it is fine grit.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 26, 2017 8:40:44 GMT -5
i was hoping that as the smaller stuff was wearing down the big pieces would break for more of a time release effect. I'm thinking of going to a run 3 days add run 4 days then do cleanout. ill have to be carefull about adding water as with all the fines last time i tried it i didn't add water and ended up with way to thick a slurry.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 26, 2017 9:32:54 GMT -5
Me too on the time release deal. Pretty sure the get brick sized chunks at manufacture, then run it thru crushers. Man that stuff makes the slurry blacker than normal. Notice that ? No matter. Adding grit every 2-3 days does make you manage the slurry thickness.
I just pour some thick slurry off and add water when adding grit every 2-3 days. Clean out after 3-4 grit additions/2 weeks. That way the older grit additions get more time with the rocks for what it's worth.
I will use your bulk stuff at a higher dose rate than graded 30 grit. And maybe supplement with the 30 grit.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 26, 2017 11:03:40 GMT -5
Me too on the time release deal. Pretty sure the get brick sized chunks at manufacture, then run it thru crushers. Man that stuff makes the slurry blacker than normal. Notice that ? No matter. Adding grit every 2-3 days does make you manage the slurry thickness. I just pour some thick slurry off and add water when adding grit every 2-3 days. Clean out after 3-4 grit additions/2 weeks. That way the older grit additions get more time with the rocks for what it's worth. I will use your bulk stuff at a higher dose rate than graded 30 grit. And maybe supplement with the 30 grit. the big chunks that don't go through the strainer when I'm cleaning out i just throw back in for another round. most of them do break eventually but after a couple months of running this stuff I'm noticing a few chunks that are actually starting to round off. I'm all about letting it run longer and letting it break down farther. less work for the ao-80 to clean up later. but I'm starting to think its getting all the real work done in the first 2 days then after that just tumbling finer for the other 5. I'm gonna add some more grit to the 2 barrels i loaded Saturday today. then compare them this weekend to the 2 i loaded sunday without grit additions. i really see no negative effects of the big chunks like bigger gouges so that's a plus.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 26, 2017 11:44:25 GMT -5
Me too on the time release deal. Pretty sure the get brick sized chunks at manufacture, then run it thru crushers. Man that stuff makes the slurry blacker than normal. Notice that ? No matter. Adding grit every 2-3 days does make you manage the slurry thickness. I just pour some thick slurry off and add water when adding grit every 2-3 days. Clean out after 3-4 grit additions/2 weeks. That way the older grit additions get more time with the rocks for what it's worth. I will use your bulk stuff at a higher dose rate than graded 30 grit. And maybe supplement with the 30 grit. the big chunks that don't go through the strainer when I'm cleaning out i just throw back in for another round. most of them do break eventually but after a couple months of running this stuff I'm noticing a few chunks that are actually starting to round off. I'm all about letting it run longer and letting it break down farther. less work for the ao-80 to clean up later. but I'm starting to think its getting all the real work done in the first 2 days then after that just tumbling finer for the other 5. I'm gonna add some more grit to the 2 barrels i loaded Saturday today. then compare them this weekend to the 2 i loaded sunday without grit additions. i really see no negative effects of the big chunks like bigger gouges so that's a plus. Yep, 2 days is probably optimum. If busy with girlfriend/family then 3 days. The big gouge theory-unless you are pressing down very hard on the big chunks of SiC the big gouges ain't gonna happen. 6 pounds of rock just does not have enough pressure to gouge the rock but so deep. My theory. Hard to put a 1/16" gouge in agate with the sharp diamond cutter much less brittle SiC. Maybe with 500 pounds of force on the tough diamond. Not so sure fresh 60 grit gouges deeper than fresh 46 grit, 30 grit, 24 grit, 15 grit, 8 grit. Think about it. But 30 grit will gouge longer than 60 grit as it breaks down.
|
|
SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
|
Post by SirRoxalot on Jun 27, 2017 11:22:04 GMT -5
So this leads to a question.
What's the cheapest grit we can get? Can you buy a hundred pounds of block or lump and give it a quick crushing yourself, with hammer or simple home-made crusher?
If around a buck and a half is the cheapest we can get graded SiC grit, 55 lbs at a time, what's the very bottom number for us few maniacs who don't blink at laying in a couple hundred pounds of the stuff?
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 27, 2017 12:01:50 GMT -5
So this leads to a question. What's the cheapest grit we can get? Can you buy a hundred pounds of block or lump and give it a quick crushing yourself, with hammer or simple home-made crusher? If around a buck and a half is the cheapest we can get graded SiC grit, 55 lbs at a time, what's the very bottom number for us few maniacs who don't blink at laying in a couple hundred pounds of the stuff? I don't know the bottom line it is bulk sic they use where I work in a foundry. added directly to the furnace. I brought some home when they put a fork through the bag and dumped a bunch on the floor before they went through with the sweeper. I sent some to james as he loves to experiment with new and different stuff. heres his original post with some pics. forum.rocktumblinghobby.com/thread/78863/raw-form-coarse-notjustone-cheap
|
|
SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
|
Post by SirRoxalot on Jun 27, 2017 16:14:20 GMT -5
Ah yes, cool beans. If you ever find out where it comes from, and what it costs, let us know, lots of raving grit junkies looking for a cheaper source...
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 27, 2017 16:57:52 GMT -5
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 27, 2017 23:07:50 GMT -5
ok I was wrong when I posted b4 it was 96 percent. the tag says "90% silicon carbide grain" in 3000 lbs "supersacks" on a pallet. r.i. lampus company. if you go to this page and click the markets tab go to bottom. www.lampus.com/alloywe don't use briquettes we add the ferromanganese, ferrosilicone, carbon, molybendinum. copper ect ourselves at different ratios depending on the job.
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 29, 2017 3:56:39 GMT -5
ok I was wrong when I posted b4 it was 96 percent. the tag says "90% silicon carbide grain" in 3000 lbs "supersacks" on a pallet. r.i. lampus company. if you go to this page and click the markets tab go to bottom. www.lampus.com/alloywe don't use briquettes we add the ferromanganese, ferrosilicone, carbon, molybendinum. copper ect ourselves at different ratios depending on the job. Looks like a phone call may answer the cost question. I'll send them an email to break ice and see if I can find out some cost info. 3000 pound super sack may be minimum order. A freight item. assume ~ $200 to $400 in freight cost. Possibly less since they ship bulk on a regular basis. I got your box. I'll do devil's advocate. Instead of adding 1 to 1.5 cups of clay for a slurry thickener, and .5 tp 1 cup of SiC 30 for a 6 pound barrel... I will add 2 to 2.5 cups straight bulk SiC and see if I can make a pure SiC super grind slurry/abrasive brew. This stuff has a mix of particles from 500 to 100 to 50 to 8 and bigger. Could result in a longer time release break down and a lot more surface grinding email: I am interested in a 3000 pound super sack of 90% SiC shipped motor freight to dock in Atlanta Georgia. Please quote. Thank you Jim Price firepitsatlanta.com
|
|
|
Post by MrMike on Jun 29, 2017 5:05:00 GMT -5
jamesp, Their website states 25 & 50lb bags and 500lb super sacks as well. What about the briquettes, you forget about your time released SiC? Says they use Portland cement binder but I'm sure they use high pressure to form these so not easily duplicated. On 2nd thought cement requires water, if you press at too high a pressure then you squeeze out the water. Maybe it's more like the process for pressing dry powdered metals. Wonder what they use for a form/die with SiC? Wonder if they'll give you wholesale price since you included your business name? Resell opportunity?
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 29, 2017 5:24:29 GMT -5
jamesp, Their website states 25 & 50lb bags and 500lb super sacks as well. What about the briquettes, you forget about your time released SiC? Says they use Portland cement binder but I'm sure they use high pressure to form these so not easily duplicated. On 2nd thought cement requires water, if you press at too high a pressure then you squeeze out the water. Maybe it's more like the process for pressing dry powdered metals. Wonder what they use for a form/die with SiC? Wonder if they'll give you wholesale price since you included your business name? Resell opportunity? Hoping the business name + 3000 pound bag would spit out lowest price for starts, barter from there ?? If they say $1.50 a pound in that quantity then forget it. Nip it in the bud. Portland binder looks totally interesting. Absolutely. Have tumbled concrete. It can be a bear, due to gases and released portland that will totally cook your hands(wear gloves and so what). BUT, has excellent time release in rotary. Some concrete too slow though. Depends on mix ratio... And a little bit of concrete with a lot of rocks is a non-issue in what you are suggesting. A 100% all concrete tumble does cause issues. So far, the easiest coarse grind has been the broken up 50 grit grinding wheels hands down. Open barrel every 10 days to add more chunks. super easy and quick grind. I believe they are putting SiC into pavers. Maybe for wear resistance or to create non-slip surface. Can't decipher.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 29, 2017 7:16:22 GMT -5
ok I was wrong when I posted b4 it was 96 percent. the tag says "90% silicon carbide grain" in 3000 lbs "supersacks" on a pallet. r.i. lampus company. if you go to this page and click the markets tab go to bottom. www.lampus.com/alloywe don't use briquettes we add the ferromanganese, ferrosilicone, carbon, molybendinum. copper ect ourselves at different ratios depending on the job. Looks like a phone call may answer the cost question. I'll send them an email to break ice and see if I can find out some cost info. 3000 pound super sack may be minimum order. A freight item. assume ~ $200 to $400 in freight cost. Possibly less since they ship bulk on a regular basis. I got your box. I'll do devil's advocate. Instead of adding 1 to 1.5 cups of clay for a slurry thickener, and .5 tp 1 cup of SiC 30 for a 6 pound barrel... I will add 2 to 2.5 cups straight bulk SiC and see if I can make a pure SiC super grind slurry/abrasive brew. This stuff has a mix of particles from 500 to 100 to 50 to 8 and bigger. Could result in a longer time release break down and a lot more surface grinding email: I am interested in a 3000 pound super sack of 90% SiC shipped motor freight to dock in Atlanta Georgia. Please quote. Thank you Jim Price firepitsatlanta.com the fines will make a slurry fast. so not sure you even need clay at all. 2 cups in a 6 lbs barrel wow. I run 1 cup in my 8" barrel. that's going to be a thick arse slurry after a few days.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 29, 2017 7:30:04 GMT -5
ive never added clay, kitty litter or any other thickener so cant say for sure but wonder if thickeners will increase cushioning which may be detrimental to breaking down the bigger chunks. hence negating the benefits of the big chunks breaking down slowly.
|
|
notjustone
spending too much on rocks
Member since January 2017
Posts: 426
|
Post by notjustone on Jun 29, 2017 7:49:54 GMT -5
|
|
jamesp
Cave Dweller
Member since October 2012
Posts: 36,553
|
Post by jamesp on Jun 29, 2017 15:59:54 GMT -5
Done a lot of separations of used 30 grit at 12-24-48 hours. The colloidal clay is both slick, creates suction, and heavy in weight and does mix the grit well and assists in the grind. Even though it is fairly thick like a thick milk shake, it helps grind. You'd think it would keep the rocks separated. I believe the suction(cohesive) forces may be the biggest factor.(think of boot stuck in mud) Fill barrel 3/4 full with rocks and water just below rock line and set it on an incline, it will probably roll. Mix clay in and tumble it for an hour. Then set it on the incline-it is hard to roll if it will at all. That is cohesive force. That is one reason why industry uses colloidal slurries for abrasive operations.
I will try 2 cups of bulk and see what what happens. Will try to get a photo of the slurry that shows thickness. Are you running real hard agates ? They are slow to form a slurry at times. Those big chunks may not be helping much, I notice them sorta rounding. They are a small percentage though.
I hear you on the slip resistance. Perfect application for SiC. I believe they put SiC in slip proof paint too.
|
|
|
Post by Garage Rocker on Jun 29, 2017 16:16:45 GMT -5
I hear you on the slip resistance. Perfect application for SiC. I believe they put SiC in slip proof paint too. Hmmmmm...I am getting ready to stain my deck and planned on using the slip resistant stuff on the steps and decking. Maybe I'll test some old paint and dump in some 60/90, see how it goes.
|
|