Just wondering if anyone has tried using sand as a pre-tumble before the first stage of 60/90 grit? If not that rushed to really start my first stage, I'll pre-tumble using sand, or the dust left over from smashing rocks. It seems to work fairly well. Instead of recharging everytime with new 60/90 grit.
No reason it wouldn't work, but it would oly cut soft materials. It needs to be coarse builder's sand. Windblown sand like what you find in deserty areas is rounded to the point it won't cut. it isn't useful for concrete production, eityher and that's why the Saudis have to import building sand. It would be useful, I guess, for cleaning off adherent mud and grainy material and removing crusts of soft minerals like calcite. Add vinegar and you have some real potential there. What kuind of stuff do you tumble and what effect does the sand seem to have? How long do you run that stage?
that's great, I was just thinking that very thing last night! I have a bunch of silica sand, I was thinking about using it in the tumbler prior to the 60/90, or maybe even in the vibe, I was thinking the sand in the vibe would be a great way to get good coverage and have a cushioning effect....however I'm concerned about the sand possibly scratching the material in the 500 and above stages...I'm going to test it on a batch of pet wood I'm not too concerned about...
I know my Grandfather used to use a hard gravel in his tumbler before the 60/90 stage...I still have a small amount of it...I'm not sure what kind of material it is...it's rough, angular, kind of black/grey...
Docharber, The effect is not that great, but it does seem to knock off the sharp edges. I polish anything found mostly agate, and pet wood, or anything else that may look nice polished. Bought some Amethyst, smokey quartz and tiger eye, which are tumbling with sand now. I'll get some pictures to show examples of rough, before and after tumbling in sand for about 45 hours. Normally about 100 hours at 78 rpm in sand. It isn't that often I do a pre-grind with sand, but it seems to help. Mikes, Use the sand only in a pre-grind stage before you start the first 60/90 stage. Never use the sand anywhere else execpt as a pre-grind. The sand is used as a replacement of the 60/90 grit. Re-charge as you go with new sand, if you are happy then you can start the first tumble with 60/90. Plus the sand or rock dust is free. Re-charging everytime with first grind 60/90 grit can get costly. This is just my idea, been doing this for a while and certainly won't hurt your hardest stones.
Post by ASI Industries on Apr 5, 2009 14:33:08 GMT -5
I know my Grandfather used to use a hard gravel in his tumbler before the 60/90 stage...I still have a small amount of it...I'm not sure what kind of material it is...it's rough, angular, kind of black/grey.
I got a 5 ton billet of Quartz-Dolerite in my rear garden just 6 inches below the surface, plus it is everwhere within 15 mile radius. -- I hail from (The Barony of Seabegs) Bonnybridge, Stirlingshire U.K, where aliens sometimes come for a visit!
If it's even muddy sandy stuff will work. You can basically place rough stones in a barrel with just water and the stones will create their own grit and round off some. It happens in nature, why wouldn't it happen in our tumblers? Grab a handful of any type sand and give it a try..see what happens.
Useing sand and water or nothing execpt water with your rough stones will do some degree of rounding. It doesn't matter what you are using as grit, just add a handfull, about 6-8 table spoons, add water to just cover the top of your stones and let it shake, rattle and roll. See what happens after 2-5 days. Most certainly the sand does help, but not as great as the 60/90. Could save some money if your are not in a real hurry to get your stones done. Or a low budget guy, like me, trying something different.
I have tumbled using sand as a "pre-grit" media more than a few times but I use it to clean rocks I collect or rocks that have been sitting outside for a while and have gathered organic mung. I will tumble them for a few hours with 4-5Tbsp of sifted beach sand or bulk quartz sand (available at craft stores or cheaper if you can find it as white sand ashtray filler). It definately starts to take the sharp edges off if you leave it going for a while but it would round off and break down quickly with most stones.
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Just wondering if anyone has tried using sand as a pre-tumble before the first stage of 60/90 grit?
A few old timers used to use sand in place of 60/90 because it was cheap. it takes longer. What makes Silicon carbide a better cutter is that it tends to break into smaller bits but fractures with new sharp/fresh cutting edges as it breaks down.
bhiatt: yep. I agree Shotgunner. Now the crowd is gathering on the main street in Ferguson. Gonna last all night. TV is all local news covering it live. Better not cut into my Two Broke Girls lol. kidding
Nov 24, 2014 19:35:34 GMT -5
glennz01: about a week away from final polish on all 80 or so lbs of my rock
Nov 24, 2014 23:45:00 GMT -5
Shotgunner: In Florida arsonists may be shot and killed, not much pillage there. Missouri should consider taking Florida's lead.
Nov 25, 2014 17:02:06 GMT -5
bhiatt: yeah they were trying to keep from that happening. Not one shot was fired by police or the national guard last night. Tonight may be different. The news was reporting seeing lots of guns in the crowd. I guess they think even more rioting if the cops start
Nov 25, 2014 17:46:08 GMT -5
bhiatt: shooting back. There were hundreds of gun fire shots last night in Ferguson. 21 fires.
Nov 25, 2014 17:47:07 GMT -5
bhiatt: hundreds of nation guard for tonight. Them ghetto boys creep around in the shadows. Its hard for them to catch them. They throw them fire bomb bottles and run of and the building goes up in flame quick.
Nov 25, 2014 17:49:42 GMT -5
bhiatt: 2200 national guard, 700 police officers. Ew Raw! I shure hope they shut them pant sangers down tonight.
Nov 25, 2014 19:13:49 GMT -5
mr.mohs: pant sangers
Nov 25, 2014 22:44:13 GMT -5
bhiatt: dang looks like New York has bigger protest going on than st Louis.
Nov 25, 2014 23:20:05 GMT -5
Fossilman: A bunch of fools!
Nov 26, 2014 0:02:30 GMT -5
wampidy: All for a silly little thing like shooting an unarmed man with his hands up six times. Police attacking news camera men like they are wild dogs. There is a large group of veterans and active duty military personnel asking the National guard to stand down.
Nov 26, 2014 9:22:50 GMT -5
wampidy: About a hundred constitutional rights have been violated and this could be a huge turning point in becoming a police state or not. We could loose a lot of rights here. I am not agreeing with the looting and fires but the police have been very bad there.
Nov 26, 2014 9:26:35 GMT -5
Fossilman: I'm talking of the looting,fires and etc........Just like the 60's and 70's again....
Nov 26, 2014 10:39:20 GMT -5
bhiatt: Here in St Louis the police or national guard have not got aggressive. That's why the trouble makers had their way. Last night they had the numbers and just swarmed the streets telling people to basically leave. This was at 11 at night not during the day
Nov 26, 2014 14:46:43 GMT -5
bhiatt: when the peaceful protestors come out. I think the police and national guard now have them basically under control. They still might be out for the rest of the week, I wouldn't doubt that. The po po and nat. guard did not want to start a big shoot out,
Nov 26, 2014 14:49:57 GMT -5
bhiatt: I probably wouldn't even be watching the crap if it wasn't so close to me.
Nov 26, 2014 14:50:44 GMT -5