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Post by Jugglerguy on Aug 27, 2013 14:43:47 GMT -5
I need to buy a better core drill for making round cabs to fit in Magnabilities necklaces. The size I need is pretty specific and I've been having trouble finding a good quality bit that produces the right sized core. The one I have now is a Lapcraft 1 1/16" from Kingsley North, but it only works on soft stones like Petoskey or Kona dolomite. For harder stones, it really doesn't work much at all. Hisgalssworks has one at a reasonable price that is sintered, which I understand is better for harder rock. Have any of you used a diamond core bit from here? Does it work well on harder rocks like agate? Is it durable?
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Post by Deleted on Aug 27, 2013 15:54:59 GMT -5
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Post by Deleted on Aug 27, 2013 16:16:44 GMT -5
I have bought core drills from a place that has them in steps of 1/16 but it may take a little while to find it. I have a couple hundred book marks that I never get around to organizing. They are probably not as good as the ones that Scott is talking about but the precise size is what I need for my rings. They drill hard nephrite like butter.
I'll be back Jim
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Post by Jugglerguy on Aug 27, 2013 16:21:31 GMT -5
Jim, you listed a few sites on another thread I started when I bought my drill press. The one that you said has the best selection was Ukam. I called there, but I had a tough time understanding the guy because he had a very heavy Russian accent. I did find out that none of their drills were close enough to the size I need. If you have another place, though, I'd love to hear about it.
Now, I'm off to check out the eBay site that Scott recommended.
Rob
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Post by Deleted on Aug 27, 2013 16:31:33 GMT -5
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Post by Deleted on Aug 27, 2013 16:31:38 GMT -5
I consider "electroplated" diamond drills inferior to segmented drills. Plus the prices are similar.
Rob, the green ones from Avanta are "medium" grade and wear very slowly on the sphere machine. The black laser welded ones will likely last me forever!
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Post by Deleted on Aug 27, 2013 16:33:13 GMT -5
This is UKAM web page and I order everything on line and have not talked to anyone. Jim
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Post by Deleted on Aug 27, 2013 16:35:41 GMT -5
If I was making spheres I would not use these, too rough on them but for straight drilling they are real good. Jim
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Post by Jugglerguy on Aug 27, 2013 16:41:23 GMT -5
I couldn't find anything on the ukam site that increased in size by 32nds. That would be perfect though. The guy I tried to talk to took my I.D. and called me back about a half an hour later, but the closest he had really wasn't very close. I measured one of my rough cores from the other bit and it was .942 inches. That's just perfect to give me enough to grind off the sides to get a good shine, but not much more. The best he could do was 1.025". I'll go look around the site a little more to see if I can find the ones that go by 32nds.
Scott, does segmented mean that there are little gaps around the drill? I thought the important thing was that they were sintered, which I understand means that the diamonds are in the metal rather than coated on the outside.
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Post by Deleted on Aug 27, 2013 16:47:26 GMT -5
Rob, go to the page that I listed for ukam and just scroll straight down on that page. It lists all the sizes. Jim
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Post by Deleted on Aug 27, 2013 18:48:36 GMT -5
I couldn't find anything on the ukam site that increased in size by 32nds. That would be perfect though. The guy I tried to talk to took my I.D. and called me back about a half an hour later, but the closest he had really wasn't very close. I measured one of my rough cores from the other bit and it was .942 inches. That's just perfect to give me enough to grind off the sides to get a good shine, but not much more. The best he could do was 1.025". I'll go look around the site a little more to see if I can find the ones that go by 32nds. Scott, does segmented mean that there are little gaps around the drill? I thought the important thing was that they were sintered, which I understand means that the diamonds are in the metal rather than coated on the outside. Segmented is a drill made of sintered diamond segments. Like those I showed you. They seem to be the most aggressive and longest lasting cutters. There can also be continuous rim sintered. That is the entire rim of the saw is sintered metal diamond Sintered is powdered metal and diamond grit put into a form and melted together. I personally think "sintered" is a poor descriptive term. Most sintered items are porous and some are even used as filters. Diamonds are stable until 4500F, so the segments can be welded to a pipe for a core drill or to a disk for a saw. Segmented also allows for field repairs in an industrial setting. My 24" slab saw has a continuous rim blade, cuts well and is long lasting. When I make my cutoff saw for chopping the corners on cubes to make spheres I will go segmented for the faster more aggressive cut. Same sort of diamond cutter, different implementation, slightly different results. Please post your end results here. Every application is different and I want to learn from what you chose to use on yours! Teach me, please!
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Post by Deleted on Aug 27, 2013 19:28:14 GMT -5
Like Scott, I am curious to see what comes of this. I hope you get it done like you want it. Jim
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Post by Jugglerguy on Aug 27, 2013 19:47:19 GMT -5
I've already had some success making round cabs for these magnetic necklaces. The only problem is that I can't do hard rocks. I've only done Kona dolomite and Petoskey stones. Actually, I've done a couple unakite cabs, but they took about 20 minutes each just to drill and a pudding stone that took over an hour. Lapcraft drill seem to suck for hard stuff. I couldn't even do obsidian.
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Post by turnedstone on Aug 28, 2013 1:00:37 GMT -5
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Post by Deleted on Aug 28, 2013 7:09:05 GMT -5
Drilling hard stone is going to take quite a bit more time no matter what hole saw you use. You can get more speed if you use the apparatus that allows water to be forced through the inside of the hole saw. Pm your address and I will send a few stones that are easy to drill and are beautiful. I do not know if you have tried Wyoming nephrite, thulite or glaucophane but I have quite a bit of the first two plus some odds and ends of other nephrite. The women really like the rings that I make out of several different nephrites and thulite.. Jim
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Post by Jugglerguy on Aug 28, 2013 19:23:01 GMT -5
Jim, thanks for the offer, but I'm piling up more rocks than I can work. I'm trying to control myself before I really annoy my wife who likes everything very tidy.
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