jamesp
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Post by jamesp on Jun 5, 2014 18:44:27 GMT -5
[[3.14 X diameter X diameter]/4] X length] - [4/3 X 3.14 X radius X radius X radius]= volume of material when you cut a sphere out of a cylinder I believe. Volume of cylinder - volume of sphere = material removed if length and diameter of cylinder is equal to diameter of sphere. 3 inch cylinder, 3 inches long = 21.2 cu in 3 inch diameter sphere = 14.3 cu in 21.2-14.3 = about 7 cu in
So you remove a third spheroiding a cylinder.
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Deleted
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Post by Deleted on Jun 5, 2014 19:54:49 GMT -5
[[3.14 X diameter X diameter]/4] X length] - [4/3 X 3.14 X radius X radius X radius]= volume of material when you cut a sphere out of a cylinder I believe. Volume of cylinder - volume of sphere = material removed if length and diameter of cylinder is equal to diameter of sphere. 3 inch cylinder, 3 inches long = 21.2 cu in 3 inch diameter sphere = 14.3 cu in 21.2-14.3 = about 7 cu in So you remove a third spheroiding a cylinder. and over half from a cube! Nice. I love your curious thinking process............ How can you ever sleep? BTW, that is partly why it's so much faster. Removing less stuff..............
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jamesp
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Post by jamesp on Jun 5, 2014 20:08:46 GMT -5
If you cored a cube twice it would be what you are doing=cubic zirconium ?? aspergers autism psychosis neurotic-proud of all of them why suffer from these disorders when you can be proud of them ?
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Deleted
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Post by Deleted on Jun 5, 2014 20:39:59 GMT -5
suffering is for pussies.
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Deleted
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Post by Deleted on Jun 5, 2014 20:48:42 GMT -5
Pupdate - kinda
I just started on a hunk of North Cady's from my scouting trip with Lowell.
Yeah.
It's gonna take awhile. LOL
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juzwuz
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Post by juzwuz on Jun 6, 2014 14:37:50 GMT -5
Scott, What kind/brand of core drill motor are you using? Justin
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Deleted
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Post by Deleted on Jun 6, 2014 17:39:01 GMT -5
PM sent
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Deleted
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Post by Deleted on Jun 6, 2014 20:37:12 GMT -5
Hey Shotgunner,
How is that N. Cadys core going? How long did it take to cut?
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Deleted
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Post by Deleted on Jun 6, 2014 21:41:37 GMT -5
I'll finish it manana. I have thirty minutes in. Maybe need another couple hours..................
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Post by beefjello on Jun 8, 2014 18:04:50 GMT -5
Grokkin' A Scott, that's a sweet build! Where there's a will there's a way, and it looks like you've willed your way to a super sphere preform shortcut
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Post by Deleted on Jun 8, 2014 19:24:51 GMT -5
beefjello --> Thanks Brian. I have started cutting my first jasper and need to make a structural change. I also think they sent me the wrong core bits. I asked for granite/quartz/hard stone cutting cores and based on the ease of cutting marble and supreme difficulty in cutting jasper I need to verify. FWIW; They make two varieties of diamond segments. The soft matrix ones are for concrete with rebar and hard (quartz/granite) aggregates. The other has harder matrix on the segments for cutting softer everyday concrete. Solution tomorrow. The core bit place is 5 miles away and I can schedule clients near them!
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Post by Rockoonz on Jun 9, 2014 0:00:47 GMT -5
@shotgunner theres jasper then theres JASPER. I have experienced a few varieties of jasper that IMO are pretty much just as hard as Brazilian and Montana agates, and any true jasper that isn't just rhyolite will be harder than marble. You might try dropping a pinch of coarse grit into the cut and run it for a minute with the water turned down to a minimum so it will wash out slower. That might expose some diamond and speed up your cut, i have heard of people doing it with sphere cups.
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jamesp
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Post by jamesp on Jun 9, 2014 1:17:31 GMT -5
The diamonds are smaller on lapidary blades(harder the material, smaller the diamond). Heat treaters use water in their lapidary saws and have to dress the blade constantly. And do not get good blade life. Would an oil drip be in order ?
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juzwuz
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Post by juzwuz on Jun 9, 2014 14:09:32 GMT -5
The last sphere I made was some sort of very hard jasper and took a long time to grind with my core drills that I use as sphere cups. The cups seemed to glaze over fairly quickly and I had to use the grit to make it grind again. I was told that the core drills I have were meant for hard materials but I have no way to verify that. I'm interested to see what you find out about your core drills.
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Deleted
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Post by Deleted on Jun 19, 2014 20:15:09 GMT -5
Hey @shotgunner, how is the coring going? I am eagerly waiting for updates.
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Post by Deleted on Jun 20, 2014 13:03:33 GMT -5
kidlet graduated high skrewl and family in from out of town. Not one minute of free time in two weeks.
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Post by Deleted on May 11, 2017 11:49:05 GMT -5
captbob asked me if I would do anything different? Steel frame would be better. Less flexion. The cores are meant for granite and such. Very poor cutting on agate/jasper. This is an issue with the core bit segments, not the machine. Haven't used it a lot due to new job status. Have predictable days off now so I can use it. If it's warm Sunday will begin coring some scenic sandstone from St George. Looks like the two pieces I took are a bookmatched pair. Not that that is very important, lol
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Post by captbob on May 11, 2017 12:52:08 GMT -5
Have you looked into whether there are core bits made for harder material - that you wouldn't have to get a 2nd mortgage to buy?
Would just going slower help or are the bits you have just not made to handle much harder than granite?
I've been thinking about getting one of those Sphere Products contraptions for cutting preforms, but your core drill seems SO much faster. Don't even have a sphere machine yet, so I'm in no hurry.
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Deleted
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Post by Deleted on May 11, 2017 13:11:43 GMT -5
Granite has quartz. That is harder than agate.
I believe the issue is that agate is "tougher" than other materials. That toughness causes the diamonds to break, but the matrix doesn't erode fast enough. The chinesium highland park has expressed extreme difficulty to solve this problem. I expect him to solve it first.
Just so everyone is clear. I did not invent this coring process. I learned of it through talking to friends and dealers at shows.
For agates I plan to try to core a cube rather than rough rock.
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Post by Deleted on May 11, 2017 13:19:18 GMT -5
On things not agate/jasper this is way way faster
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