> Lee > OK,so when I imagine "two steel plates that are set closer at the > bottom than the top." I get the picture that they make a narrow > "vee", > touching at the bottom. I imagine then, that one wheel is passive > (rotates > freely) and the other is driven so that the material gets rolled > between the > plates and consequently the material transmits some of the rotation > to the > passive disc. > Sounds like a nice idea but does it match reality?
Well, Duff;
Hank, not Lee here........ It certainly does. My jaw crusher and plate mill will take hardball- sized rocks(the harder the better) down to 18_10 mesh in the jaws and the plate section will take that down to -100 mesh. The ball mill is used to go finer. it does take a five horse B&S motor to do the work but it is fast...... can process feldspar at 1000#s a day.
I don't know if any of you have ever used an impact mill, but I sure like mine a lot. It makes a jaw crusher look like a slow moving glacier by comparison. For crushing granodiorite, feldspar and other medium-hard stuff it's very fast. The feed material has to be broken down to about 1 inch and smaller. There is a four vaned paddlewheel in a steel canister that spins at 2,000 rpm and batters the stuff down to about 10- mesh, then blows it into the collector. Most of it is much finer. I sift it to 16- and put that material in the pebble mill. The impact mill is like a hammer mill, but without the swinging hammers. I bought it for a hundred bucks (sans motor) from a guy who came in the driveway one day because he thought I might need it.
I started out with a small electric powered jaw crusher that a friend built for me. He's a guy who likes the challenge of this kind of stuff. I didn't have $500 for the really good bearings, so it has worn out bearings and is awaiting repair in my shop. I imagine they might be $800 by now. It was a slow proposition to crush stuff in it.
I also bought one of the "mini mills" that Lee is writing about. It's a great little hand powered jaw crusher for making samples and small runs of a pound or two, but more than that can get tiresome. One jaw is stationary and one moves up and down in a slight curve.
It's always nice to find material that Mother Nature has milled for us.
>> Lee >> OK,so when I imagine "two steel plates that are set closer at the >> bottom than the top." I get the picture that they make a narrow >> "vee", >> touching at the bottom. I imagine then, that one wheel is passive >> (rotates >> freely) and the other is driven so that the material gets rolled >> between the >> plates and consequently the material transmits some of the rotation >> to the >> passive disc. >> Sounds like a nice idea but does it match reality?
> Well, Duff;
> Hank, not Lee here........ > It certainly does. My jaw crusher and plate mill will take hardball- > sized rocks(the harder the better) down to 18_10 mesh in the jaws and > the plate section will take that down to -100 mesh. The ball mill is > used to go finer. it does take a five horse B&S motor to do the work > but it is fast...... can process feldspar at 1000#s a day.
> I don't know if any of you have ever used an impact mill, but I sure > like mine a lot. It makes a jaw crusher look like a slow moving > glacier by comparison. For crushing granodiorite, feldspar and other > medium-hard stuff it's very fast. The feed material has to be broken > down to about 1 inch and smaller. There is a four vaned paddlewheel in > a steel canister that spins at 2,000 rpm and batters the stuff down to > about 10- mesh, then blows it into the collector. Most of it is much > finer. I sift it to 16- and put that material in the pebble mill. The > impact mill is like a hammer mill, but without the swinging hammers. I > bought it for a hundred bucks (sans motor) from a guy who came in the > driveway one day because he thought I might need it.
Yes, Paul;
I have used David Stannard's hydraulic impact mill which worked just as you describe. The twist he brought to the mill is that it was driven by a hydraulic pump that was driven in turn by the raised back tire of the Datsun pickup he used to go prospecting in. just idling, there was plenty of hydraulic power available to drive the mill. Here is a pic:
> I started out with a small electric powered jaw crusher that a friend > built for me. He's a guy who likes the challenge of this kind of > stuff. I didn't have $500 for the really good bearings, so it has worn > out bearings and is awaiting repair in my shop. I imagine they might > be $800 by now. It was a slow proposition to crush stuff in it.
the one i have is pretty fast, making quick work of 2" material, the harder the better.
> I also bought one of the "mini mills" that Lee is writing about. It's > a great little hand powered jaw crusher for making samples and small > runs of a pound or two, but more than that can get tiresome. One jaw > is stationary and one moves up and down in a slight curve.
I have one of those made by the inventor in Trona CA.
> It's always nice to find material that Mother Nature has milled for > us.
Much easier, but those Rhyolites that were hydrothermally altered are too hard to find as powder.
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