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Post by Original Admin on Jan 9, 2006 10:47:54 GMT -5
Posted by Sansman.
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jrtrio
has rocks in the head
With10 tumblers tumbling the sound is so delicious!Send me more of those little red fellas, please?
Member since February 2006
Posts: 535
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Post by jrtrio on Jan 7, 2007 10:09:16 GMT -5
Has anyone else find that when tumbling this rough that it either goes beautifully or poorly? Beautifully because it just polishes up fantastic, or poorly because it breaks up into small bits that can scratch up a load fairly fast so you have to keep an eye on a load that has it in it?
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rollingstone
starting to spend too much on rocks
Member since July 2009
Posts: 236
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Post by rollingstone on Jan 8, 2007 3:11:23 GMT -5
I recently put some Oregon carnelian through coarse grind, and it looks somewhat different than the photo above -- the rough I used was generally a lighter colour of red, and it was more uniform in colour, ie, didn't have a central reddish band, but was more uniformly yellowy-orange-red. Oh heck, I'll post a pic at the end of this reply to show what I mean. Anyhow, my problem with carnelian was not any chipping problem like jrtrio mentions, but I found it the roughest rough I've ever encountered. Huge pits and crevasses, took me a good 12 weeks to get that rough through coarse grind, even with chisel shaping and Dremel shaping. Nasty stuff -- hope it makes up for it in the end. ;D -Don
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Post by Tweetiepy on Jan 8, 2007 13:49:13 GMT -5
I had some small pieces of this stuff as well and I agree with Don, really hard stuff... but well worth it they turn out beautiful - can't wait to see Don's (which will be 250% better than mine were)
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spacegold
has rocks in the head
Member since September 2006
Posts: 732
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Post by spacegold on Jan 10, 2007 15:33:50 GMT -5
These pictures look like crushed, blasted, or hammer broken material, which, in hard stones like agate, takes a long time to smooth up. Often weeks and weeks in the coarse. Breaking also creates some of the fractures that cause the stone to disintegrate in the tumbler. When tumbling broken stone, it is worthwhile to spend some time with it on a coarse carborundum grinding wheel before putting it into the tumbler. You can work out some of the innies that way.
With carnelian, it is usually better to try to get the unbroken nodules and cut them with a small saw into pieces that will more easily tumble. Even cutting little slabs from which a single cab can be made is a lot easier than trying to smooth up that broken rough.
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