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Post by Jugglerguy on Aug 3, 2015 9:50:32 GMT -5
This isn't exactly a cabochon, but I'd love to know how to cut a hole like this in a Petoskey stone. Obviously, I could start by drilling a hole, but what sort of tool would I use to grind out the pointy bottom?
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Post by woodman on Aug 3, 2015 11:14:21 GMT -5
Diamond file and lots of time.
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cobbledstones
spending too much on rocks
Member since January 2014
Posts: 482
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Post by cobbledstones on Aug 3, 2015 11:48:31 GMT -5
an ultrasonic drill can do that, but the machine is out of my price range.
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Post by Drummond Island Rocks on Aug 3, 2015 13:41:47 GMT -5
woodworking scroll saw with a diamond blade installed. drill hole then insert blade through the hole. probably pretty easy work with petoskey stone even done dry. I have an old one so if I were to do it I would probably rig up a drip feed then just blow it off when done with the air compressor to dry it diamond blade www.woodcraft.com/product/413696/ps-wood-diamond-wire-scroll-saw-blade-.aspxblades mount in a standard woodworking scroll saw Chuck
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Post by Jugglerguy on Aug 3, 2015 15:18:53 GMT -5
I think I'll just leave my Michigan shapes holeless, but I saw one like that in a store last week and wondered what the best technique for making it was. It has really good detail around the outside too.
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Post by Drummond Island Rocks on Aug 3, 2015 16:02:10 GMT -5
same scroll saw blade would cut that outside shape flawless too. makes me wonder if there is a "wet" scroll saw version somewhere?
I would try it for $30 but I looked and my saw takes a different style blade on the holding feature.
Chuck
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Post by Drummond Island Rocks on Aug 3, 2015 16:26:33 GMT -5
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Post by Jugglerguy on Aug 3, 2015 16:30:05 GMT -5
I've been searching for a lapidary scroll saw, but I haven't had any luck. It seems that a ring saw is similar to a band saw in that it has a continuous loop blade.
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Post by Drummond Island Rocks on Aug 3, 2015 16:30:41 GMT -5
I've been searching for a lapidary scroll saw, but I haven't had any luck. It seems that a ring saw is similar to a band saw in that it has a continuous loop blade. That is correct. You need a straight blade that can be fed through a pilot hole for inside cuts
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Aug 26, 2015 12:41:11 GMT -5
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Post by Jugglerguy on Aug 26, 2015 13:01:37 GMT -5
I didn't know you could get separating blades. Do the blades last very long?
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Post by orrum on Aug 26, 2015 14:16:23 GMT -5
Hey Rob ask Kap. I got some saw scrap and he had cut hearts out of some of the slabs. No idea how he did it.
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Aug 26, 2015 15:32:54 GMT -5
Blade life is determined by how hard you push, the hardness of material being cut, and operating temperature. There are probably a few other variables I'm forgetting.
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