Noah
starting to spend too much on rocks
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Member since November 2003
Posts: 102
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Post by Noah on Dec 9, 2003 14:55:05 GMT -5
I'm just curious if anyone would know why Green aventurine would wear away a 60 grit grinding wheel in less than an hr...I know the stones not extremely hard...it was just very odd... (The aventurine had also already been run through a 7 day tumble w/ Coarse 60/90 ) Any clues would definately help out with this...
-Noah-
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Post by docone31 on Dec 9, 2003 16:33:52 GMT -5
Noah, aventurine is a crypto-chrystalline. It is extremely hard and fragments. Also, the speed of the grinding wheel is a factor. The best speed is 1750. If you have a bench grinder, it turns at 3350. Go to Home Depot, or Ace hardware, get a ceiling fan rheostat, 600watt. This will turn down the grinder speed. Water is also reccomended. Either a drip, a bucket with a hose dripping on the wheel, or a coffee cup full of water. The other issue is wheel bounce. I dop my stones and use a wood rest for grinding. Also, grind from the bottom to the top rather than the top to bottom. So the main things are speed, heat, and stability. If you run into any unexpected issues with soldering with a propane torch, do not hesitate to write. I am currently working on a box ring with .040 sterling, size 12. A lot of silver. I am using hard solder with borax flux. I also use 2X12's for fire rebound. Good luck.
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