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.
nowyo: Aw crap. Knew that might be coming but was hoping for the best. Tell him to hang in there.
Jul 24, 2014 23:31:36 GMT -5
rockpickerforever: Wishing you and your son the best, Jim. Jean
Jul 25, 2014 15:31:05 GMT -5
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drocknut: Jim, sending prayers for your son and your family.
Jul 27, 2014 16:16:20 GMT -5
snowmom: Good morning! 50 degrees here with the wind from the NW, leaves rustling and it makes me restless... the rocky beaches will be in full song this morning. Think I'll take my camera and take some pics this morning for show and tell. what are you all up to?
Jul 28, 2014 5:24:08 GMT -5
wampidy: Sitting in my underwear in front of the computer drinking cappuccino and eating brown sugar and cinnamon pop tarts. A mental image you probably could have went without but you asked. Want to go hounding, all gassed up but I gotta buy some new tires for my
Jul 28, 2014 5:58:04 GMT -5
wampidy: pickup before I go running around in the hills. One of my goodest tires has a bulge and all the tread is worn off of it in that spot. Tells me that I probably should have replaced it a long time ago but it is just a little wup wup.
Jul 28, 2014 6:01:01 GMT -5
snowmom: LOL, I did ask.. I'll be more careful next time! I expect hounding out there is a terror on tires- all those sharp rocks...
Jul 28, 2014 6:12:29 GMT -5
drocknut: Snowmom at least he didn't say he was naked...;)
Jul 28, 2014 18:42:15 GMT -5
rockpickerforever: Diane, if he said he was sitting in his underwear, most would understand that he is not naked. What's wrong with naked, anyway? ...Unless that's your laptop sitting in his lap, ho ho!
Jul 28, 2014 20:08:31 GMT -5
rockpickerforever: Ouch! Ha ha, gotta at least wear some leather chaps! How're you dune, Ed, out in that furnace they call Phoenix? Grinding and sweating? Mostly? You do what it takes...
Jul 29, 2014 0:58:51 GMT -5
mr.mohs: grinding naked...best way to get a buff on stone
Jul 29, 2014 9:39:27 GMT -5
mr.mohs: howdy Jean - doing a mild summer- that's two in a row- Phoenix is the best weather in the country-another few weeks and I'll be scantily dressed & in full rock'n heart production...take care..Ed
Jul 29, 2014 9:42:35 GMT -5
wampidy: There was not one of the tires on my pickup good enough to replace my raggedy spare. Just went ahead and bought all four. As bad as the front tires were it is a wonder I am not laying in a ditch somewhere between here and Quartzsite.
Jul 29, 2014 23:23:50 GMT -5
wampidy: Sure drives nice now except for the wandering. Replaced the steering ball joints before I left for Q and they already have a bunch of slop in them. Must have been a tad bit of stress there on the trip.
Jul 29, 2014 23:27:08 GMT -5
Fossilman: New tires are always a blessing...
Jul 30, 2014 8:54:32 GMT -5