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Post by roswelljero on Apr 6, 2008 23:45:12 GMT -5
Where can I purchase a set of grit sieves?
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Post by deb193redux on Apr 6, 2008 23:51:39 GMT -5
There are some rock sieves to screen rock. There are some sieves to seperate pellets.
I don't know anyone who sives grit. I have seen some systems described that use an upward flowing water column to sort grit. Try google for that. Hydro...somethng
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rallyrocks
fully equipped rock polisher
Member since November 2005
Posts: 1,507
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Post by rallyrocks on Apr 7, 2008 0:49:57 GMT -5
I have tried to no real avail, because you have so many intermediate break down products, any sieve fine enough for capturing any grit you'd want to keep is so fine that it will clog instantly and completely with the range of stuff left in slurry.
I could see how a system like Daniel described might do the trick for industrial purposes, with enough dilution you probably could overcome this effect, but it seems a bit beyond the resources of most hobbyists.
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Post by deb193redux on Apr 7, 2008 11:20:35 GMT -5
Yeah, I see patents for the industrial process. There used to be a web page where a guy described a more primitive system with a 2-liter bottle. Can't find that now.
Basically he cut the bottom off, an mounted the bottle spout down with a hose attached. The whole apparatus was over a plastic tub. He had a good many-turn valve on the hose.
In step one he used very little water flow, and the only thing to flow over the top was unwanted mud.
When the mud was gone, he increased the flow, and then had (theoretically) fine grit flowing over the top. This was trapped in a clean tub.
Then he increased the flow, and (so he claimed, if you could get the flow just right) medium grit started flowing over the top while course stayed in the bottle. This too was trapped in another tub
This left course in the bottle, medium in one tub, and fine in another.
Seemed like a lot of work for something that can be bought cheap.
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Post by roswelljero on Apr 7, 2008 18:38:08 GMT -5
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L.L.
starting to spend too much on rocks
Great Pyrenee?s Lover Extraordinaire
Member since January 2008
Posts: 135
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Post by L.L. on Apr 7, 2008 18:48:40 GMT -5
I think you misunderstood what he was referring to. The sieves are just the strainers he uses for each grit stage. The 80 grit sieve for instance is only used for that phase to prevent cross contamination. He's simply stating that you need a set of sieves, colanders, strainers, whatever you want to call, one to cover each individual step.
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Post by roswelljero on Apr 7, 2008 19:08:11 GMT -5
So, what do you all use as a strainer/sieve for each step/grit?
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Steve
has rocks in the head
Member since June 2005
Posts: 506
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Post by Steve on Apr 7, 2008 19:58:46 GMT -5
The cheapest plastic colander that I can find. I prefer the round ones that will fit over a 5 gallon bucket.
Steve
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Post by deb193redux on Apr 7, 2008 21:14:05 GMT -5
Personally, I use one strainer, and just wash it well between grit sizes. I actually have several, but at any moment I reach for a strainer, some are full or some are not clean. I am just glad to find one that is empty and I can use it.
I rinse really well and all grit is removed form the rocks as well as the strainer. I have never had a problem with cross-contamination form a sieve, but I understand the concept.
If you have a tub you can set in a utility sink and set the strainer in the tub, the exact shape of the strainer is not critical. IF you do not have a utility sink with a drain, you might want the strainers that fit into the top of a 5 gallin bucket. Later you can dump the bucket outside.
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Post by catmandewe on Apr 7, 2008 21:14:32 GMT -5
I use the screens off the windows from my neighbors house, when I am done with them I put them back on the neighbors house and they never know the difference. Each neighbors house is a different grit. The only way I can keep it straight. Sometimes I have to clean my rocks late at night to keep from waking the neighbors.
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Post by deb193redux on Apr 7, 2008 21:28:17 GMT -5
Funny.
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Post by connrock on Apr 8, 2008 5:44:29 GMT -5
There is a process called "elutriation" where an "elutriator" is used to separate fine particles of minerals.etc. The easiest way to give you an example of how an elutriator would work (in this case) would be to think of an out side water fountain,,,,,,,  The slurry would be put in the top of the fountain and water would flow VERY slowly leaving the heavier grit behind while the lighter grit flowed down to the next section of the fountain,etc,etc. I've made a few of these and to tell you the truth it's just not worth the time,effort and water used to save a very small amount of grit and money.You have to use a LOT of water. Another point is that silicon carbide grit has sharp edges on it and this is rounded off with use making it less efficient every time it is reused. I love to experiment and make gadgets so it was fun doing it out side on some nice warm summer days. |
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chassroc
Cave Dweller 
Rocks are abundant when you have rocktumblinghobby pals
Member since January 2005
Posts: 3,586
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Post by chassroc on Apr 9, 2008 12:02:33 GMT -5
Nice Pickup Roswell, never noticed that before;
even though it does not read that way, I believe LL got it right; There are people who are very anal about every step in Rock Tumbling, usually with good reason. You can have seperate barrels, sieves, plastic or ceramic filler, etc for each and every step. For some of us this is just not practical.
Grit is more likely to embed itself and into and cause cross stage contamination if you use plastic. If you use metal or ceramic, you will be able to clean easily between stages.
Your rubber barrels might be hiding places for grit from stage to stage, but remember that if you run each stage for a week, the grit breaks/grinds itself down during that week. So Coarse grit is not so coarse and medium grit is not so medium and fine is not as fine after a week. For this reason it pays in a very practical sense to be frugal with your grit. Don't use too much, let it breakdown properly and you are reducing the chance of a problem if you use the same barrel as you progress.
Many of us use plastic pellets both as filler and to reduce breakage, especially in the final stages. You must be religious about segregating plastic pellets and only using them in a distinct stage
Hope this helps...csroc
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