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Post by taogem on Jan 4, 2008 18:58:53 GMT -5
I read someplace that some minerals, like agates, can be ground dry.
What type of abrasive wheels do folks dry grind minerals like agates with?
Thanks....
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Post by captbob on Jan 4, 2008 19:40:06 GMT -5
All I can think is that they sure would get hot!
ouch ouch ouch
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Post by ladyt on Jan 4, 2008 20:10:55 GMT -5
The dust from grinding any rock is dangerous. Not good to dry grind. Water keeps them cool so they don't crack up and keeps the dust down so you don't crack up.
T
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Post by Jack ( Yorkshire) on Jan 5, 2008 2:06:08 GMT -5
Hi Teo, I dry grind a few things and use a good dust mask works well for me As you are holding the stone in your hands you feel when it is getting warm and put it down and grind another , so it dosent get to the critical fracturing temps. In cold tempratures this time of the year it is a LOT easier on your hands than cold water !! Oh Types Jasper Quartze agates Jack Yorkshire UK
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Post by johnjsgems on Jan 5, 2008 9:41:48 GMT -5
I have a friend that dry sands with wet/dry belts. He is a retired car painter and wears a respirator mask. A cheapy dust mask won't keep the silica dust out of your lungs. Dry sanding works well but not worth the risk in my opinion.
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RockyBlue
fully equipped rock polisher
Go U.K.
Member since June 2006
Posts: 1,719
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Post by RockyBlue on Jan 10, 2008 14:17:28 GMT -5
Hey Teo! John is right! I do dry sanding with wet/dry belts,i also have a shop vac hose hooked up to my grinder[thanks to Randy].I wear a respirator with carbon filters that i used when i did custom painting on cars................Rocky
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Post by taogem on Jan 10, 2008 20:55:49 GMT -5
Hey Teo! John is right! I do dry sanding with wet/dry belts,i also have a shop vac hose hooked up to my grinder[thanks to Randy].I wear a respirator with carbon filters that i used when i did custom painting on cars................Rocky I was sort of thinking that there might be some type of abrasive wheel made from maybe some type of stone or even the silicon carbide type wheels for dry grinding. Something that would let me apply some serious pressure. My motivation for dry grinding is more to get away from wearing out belts and even my diamond wheels that I presently use with water. Just trying to figure out a way to take some serious meat off quickly without the wear on expensive belts and diamond wheels.
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Post by docone31 on Jan 10, 2008 22:32:25 GMT -5
That is simple, even if you have to make a peg faceter type of dop. Use a diamond blade and cut off the excess first. Then do the grinding. Water not only dampens the dust, it cools and acts like an enhancement on grit. A 220 will seem like it is a 100, and on and so forth. I dry grind sometimes, mostly because I do not want to start the bath for so short a run. I use dop wax. When the stone starts to slide on the dop, it is time to take a short break. I also use a spray bottle of water to hand spray both the stone and wheel. With my silicone grit belts, I run them mostly dry. I just go lightly. My 1200 belt is four years old and still grinding. This has never seen water. I have even done opals with it. Just go tender with dry grinding.
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