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 May 6, 2006 9:16:55 GMT -5
When you guys do pre-shaping with the dremel which bit do you use? Understand that I do have the flex-shaft and have a little tray that I've rigged up for drilling and grinding under water. So, what i want to know is which burr for the job? Which burr for pre-shaping, which burr for grinding off imperfections, which burr for taking off large portions of rock. I have a rock that has granite like rock sandwhiching another type of stone in between. I'm sure someone could ID this rock for me if my son hadn't taken my camera back to school with him! It's like I said. A granite like rock with a sandy type green rock in between. Anyone? Any ideas? Oh well. Back to the bits. One last question. What kind of bit should I use to drill a hole through rock to place a jump ring? I'm guessing that's all I need to know right now. But, if I do run into something I can't handle, I'll be back here!
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Post by gemkoi on May 6, 2006 13:31:17 GMT -5
Hey Jrtrio, good question. Well you know to start with diamond period. The next depends on the job. From drill, their are diamond drill bits, and core diamond drill bits. There are many grades, like in any cutting tool. But for drilling i buy just standard diamond drill bits from Kingsley. I used both cheapies and expensive ones, and do prefer the expensive ones for the life of the bit. The cheap ones you can blow through in a matter of seconds if the tip gets to hot. Just remember either way to plunge the bit, pull out, repeat again and again until hole is drilled. YOu only need to really hold the bit to the stone with constant pressure when starting the hole. As far as shaping, certain shaped bits do certain jobs. I was asked recently about the difference between and barrel shape bit, and a cone shaped bit. He wanted to know which worked best for contouring a stone hard edge. Both could work, however the barrel shape worked better for fast removal of waste, and the cone worked better on refining any board contour. lascodiamond.com/ is a good place to start. lascodiamond.com/products/8thpg1.htm shows large bits in many grit stages. Generally speaking, the large the surface, the more heavy cutting a bit will do. The smaller the surface, it meant for getting into hard to reach places. So if you're looking to just shape a rock, and not really carve it. Standard barrel (CL95, CLR95) that Lasco has for sale would be perfect. IF your looking to carve heavy curves, odd angles into the stone. Then you would have to experiment with smaller and more refined burrs for that kind of work. And on your green vein in Granite, sounds like Epidote, and when mixed with pink feldspar, Unakite would be a common name for it.
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