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Magnetic Granite??!!
Awl--
Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll |
Magnetic Granite??!!
On a whim, I tried to cut a sample tile of Granite with an old plasma source.
Thought - nothing lost - this is just about junk. The plasma dug deep - almost 1/4" and started to move down the drawn line when it stopped. The melted granite was a spear of glass. Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member Proctologically Violated©® wrote: Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Magnetic Granite??!!
It would be interesting to know what granite was used for the base of
your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction . Proctologically Violated©® wrote: Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll |
Magnetic Granite??!!
Did you hear about the boy who died as a result of those type of magnets?
Seems they make toys that use the rare earth mags for attaching body parts to one another, the child swallowed one that had fallen out. Several hours later he found and swollwed another one. THe first one was on its way to safely pass through the childs system but when the other one was swallowed they did what they do best and the result was extreme pain after a day or so and then I beleive he died after. The docs said that the mags connected thus casuing his colon to become attached to his stomach, closing off his entire system. I use the hard drive mags around the shop all the time, two to hold my drill press vise to the base when not in use. Searcher |
Magnetic Granite??!!
Proctologically Violated©® wrote:
Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll Those hard drive magnets are very useful. I used four of them to attach my static phase convertor to my power hacksaw. The convertor probably weighs 25 lbs, but four magnets hold it quite adequately. It avoided the nightmare of trying to drill and tap holes in the machine. Chris |
Magnetic Granite??!!
Christopher Tidy wrote:
David Billington wrote: It would be interesting to know what granite was used for the base of your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction. Given the strength of these magnets I could believe it was just being attracted to a steel fitting in the centre of the height gauge base. Is this possible, or was it definitely being attracted to the granite? Chris Around here (east Clackamas County, Oregon) you can wander around with a magnet and pick up gravel. Iron's a pretty common element, which has a lot to do with why steel is so cheap. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ |
Magnetic Granite??!!
Stones, incl. gemstones, are perty pedestrian, chemically speaking.
I remember seeing the formulas for various gemstones in Erf Science, and feeling quite deflated, a little cheated, by the mundanity of them all. SiO2, Al2O3, peppered w/ various metal ions, such as potassium, sodium, beryllium, boron, etc. And, apparently, iron. Ultimately super-expensive glass and grinding wheels, w/ impurities!!! And in the case of diamond, just goddamm Carbon!! And thermodynamically *unstable* C, at that!! Altho, the various colored diamonds must have another metal stuck somewhere in the crystal lattice, which probably reduces the hardness somewhat. Compared w/ organic molecules, such as chlorophyll, the porphyrin ring in hemoglobin, vit B12, and other structures, stones are perty plain. Nickel is weakly magnetic, as well. Also liquid oxygen, and a cupla other things. Someone mentioned Bn? What's dat?? As far as metal in the granite base, I don't believe there is any, as I cain't see any and the magnet sticks uniformly over the whole surface. Metal would likely produce local attractions. You can detect the magnetic properties w/ a good telescoping pickup wand, but not as nice as with one of those hard drive mags. Need a high mag strength/weight ratio to really see the effect. Could be that magnetic granite is crappy granite. Chinese base, donchaknow... But at any rate, it will be an interesting past-time to see what rocks are magnetic around here! -- Mr. P.V.'d formerly Droll Troll "David Billington" wrote in message ... It would be interesting to know what granite was used for the base of your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction . Proctologically Violated©® wrote: Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll |
Magnetic Granite??!!
David Billington wrote:
It would be interesting to know what granite was used for the base of your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction. Given the strength of these magnets I could believe it was just being attracted to a steel fitting in the centre of the height gauge base. Is this possible, or was it definitely being attracted to the granite? Chris |
Magnetic Granite??!!
One of my college profs had a set up using multiple LARGE permenant
magnets to generate a strong field for an experiment. The kind that you need to remove your wrist watch to work on. The protective cover for the unit was a piece of birch plywood grown in the Minnesota iron range area. It had a gentle but firm attachment to the rig. Christopher Tidy wrote: Proctologically Violated©® wrote: Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll Those hard drive magnets are very useful. I used four of them to attach my static phase convertor to my power hacksaw. The convertor probably weighs 25 lbs, but four magnets hold it quite adequately. It avoided the nightmare of trying to drill and tap holes in the machine. Chris |
Magnetic Granite??!!
Remember the color of SiO2 - clear to white. The 'black' ones might have olivine
and iron within. The pink ones - pink is something else. Complex chemistry made by a volcano. Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member David Billington wrote: It would be interesting to know what granite was used for the base of your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction . Proctologically Violated©® wrote: Awl-- Wouldna bleeved had I not seed it. Friend brought over a magnet from a hard drive (really nice strong magnet), and BAM, stuck right to the granite base of my height gauge! Well, actually, it's just the granite base, cuz there is no height gauge--supplier's scrap heap, donchaknow.... :) And stuck perty good! wow.... Thus, boyzngerlz, thar must be iron in them thar granite hills!! -- Mr. P.V.'d formerly Droll Troll ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Magnetic Granite??!!
On Mon, 24 Apr 2006 00:17:56 GMT, "Shopdog" wrote:
Did you hear about the boy who died as a result of those type of magnets? Seems they make toys that use the rare earth mags for attaching body parts to one another, the child swallowed one that had fallen out. Several hours later he found and swollwed another one. THe first one was on its way to safely pass through the childs system but when the other one was swallowed they did what they do best and the result was extreme pain after a day or so and then I beleive he died after. The docs said that the mags connected thus casuing his colon to become attached to his stomach, closing off his entire system. I use the hard drive mags around the shop all the time, two to hold my drill press vise to the base when not in use. Searcher When the cheap plastic ring holding casters to the bottom of my shop vac. disintegrated, I made a wood base with a pair of these attached. Works like a charm. Gerry :-)} London, Canada |
Magnetic Granite??!!
Another good way to demo this is using a cylindrical magnet and drop it
through a copper tube like used for plumbing. Re your sorting method I believe this is similar to how many vending machines validate that a coin is what it should be rather than a counterfeit. Dave Hinz wrote: On Mon, 24 Apr 2006 01:08:33 +0000, Christopher Tidy wrote: David Billington wrote: It would be interesting to know what granite was used for the base of your height gauge. The black granite I have about shows no magnetic attraction at all when NiFeBn magnet is placed on it. As granite is predominantly SiO2 it would be interesting to know why the magnetic attraction. Given the strength of these magnets I could believe it was just being attracted to a steel fitting in the centre of the height gauge base. Is this possible, or was it definitely being attracted to the granite? Another thing to consider is eddy currents. Take a hard drive magnet assembly, one with the self-contained yoke and magnets on both sides. Old seagate drives, for instance. If you drop a dime through it, it slows down noticably while falling through the gap. A quarter, more so. A half dollar, takes nearly 1 second to drop through the gap (really!) If you're wondering, this is related to my "how to I separate zinc pennies from copper pennies" question of last week. As soon as I can get a good ramp/guide, I should have some wacky pictures of my low-tech sorting method. Dave Hinz |
Magnetic Granite??!!
On Mon, 24 Apr 2006 21:01:28 +0100, David Billington wrote:
Another good way to demo this is using a cylindrical magnet and drop it through a copper tube like used for plumbing. Re your sorting method I believe this is similar to how many vending machines validate that a coin is what it should be rather than a counterfeit. As soon as I can find/fab a good ramp, I'm good to go. Keeping the friction down while the guidance is still good, is the trick. I know two ways not to do it at this point. But yes, fun with eddy currents is a great desk-toy. |
Magnetic Granite??!!
David Billington wrote:
Another good way to demo this is using a cylindrical magnet and drop it through a copper tube like used for plumbing. Re your sorting method I believe this is similar to how many vending machines validate that a coin is what it should be rather than a counterfeit. Actually, this demo works okay with just about any NIB magnets, even if they aren't cylindrical. Give it a go. Chris |
Magnetic Granite??!!
Thanks Chris,
The last time I did this demo was for some friends using magnets salvaged from some wedding corsage after a wedding I attended in Holland. The florists had used small NiFeBn magnets taped to the flower stem and another inside the lapel or dress to hold the flowers in place. About 10mm diameter and 2mm thick, these were a nice fit in standard copper tubing, 15mm?, and the increase in time taken to fall compared to a non magnetic item was quite amazing. I grabbed all the unwanted corsages and stripped the magnets, although they are not expensive these days and readily available. Christopher Tidy wrote: David Billington wrote: Another good way to demo this is using a cylindrical magnet and drop it through a copper tube like used for plumbing. Re your sorting method I believe this is similar to how many vending machines validate that a coin is what it should be rather than a counterfeit. Actually, this demo works okay with just about any NIB magnets, even if they aren't cylindrical. Give it a go. Chris |
Magnetic Granite??!!
On Tue, 25 Apr 2006 00:19:56 +0000, Christopher Tidy
wrote: David Billington wrote: Thanks Chris, The last time I did this demo was for some friends using magnets salvaged from some wedding corsage after a wedding I attended in Holland. The florists had used small NiFeBn magnets taped to the flower stem and another inside the lapel or dress to hold the flowers in place. About 10mm diameter and 2mm thick, these were a nice fit in standard copper tubing, 15mm?, and the increase in time taken to fall compared to a non magnetic item was quite amazing. I grabbed all the unwanted corsages and stripped the magnets, although they are not expensive these days and readily available. I have maybe 20 small trapezium shaped magnets from 500 MB hard drives. I'm not certain of the composition, but I think it may be NdFeB. I used some for a demonstration at a school a couple of years ago. They will creep down a 3 mm thick aluminium plate inclined at 80 degrees at only a couple of centimetres per second. The speed in an aluminium tube with 3 mm walls is about the same. You can do some fascinating demonstrations with these magnets which aren't easily observed with weaker magnets. They're great fun. Best wishes, Chris Greetings Chris, This is such a good demo that when a neighbor asked me if I could help a friend's child with a science paper/demo this is what I thought of. The cool thing about it was that the demo related to all sorts of things. From generators to speedometers to scales. And the concept is simple enough for most 8th graders to understand. The kid who I did this for wasn't the brightest bulb when it came to science and I was able to get him to realize how and why it behaved the way it did. The new, strong, rare earth magnets are tons-o-fun and really show graphically the effects of magnetism. Imagine how keenly observant the first researchers into magnetism must have been when the only magnets were lodestone. The first time I saw this and learned what it was I was 13. The three beam scales in school had an aluminum plate that passed between two magnets as the damper. When I took apart my first speedometer, (from a VW), I saw a disc connected to the rotating cable surrounded by an aluminum cup. After thinking about it for a second I knew exactly how it worked and why the speedo was malfunctioning. ERS |
Magnetic Granite??!!
David Billington wrote:
Thanks Chris, The last time I did this demo was for some friends using magnets salvaged from some wedding corsage after a wedding I attended in Holland. The florists had used small NiFeBn magnets taped to the flower stem and another inside the lapel or dress to hold the flowers in place. About 10mm diameter and 2mm thick, these were a nice fit in standard copper tubing, 15mm?, and the increase in time taken to fall compared to a non magnetic item was quite amazing. I grabbed all the unwanted corsages and stripped the magnets, although they are not expensive these days and readily available. I have maybe 20 small trapezium shaped magnets from 500 MB hard drives. I'm not certain of the composition, but I think it may be NdFeB. I used some for a demonstration at a school a couple of years ago. They will creep down a 3 mm thick aluminium plate inclined at 80 degrees at only a couple of centimetres per second. The speed in an aluminium tube with 3 mm walls is about the same. You can do some fascinating demonstrations with these magnets which aren't easily observed with weaker magnets. They're great fun. Best wishes, Chris |
Magnetic Granite??!!
On Mon, 24 Apr 2006 17:03:49 -0700, Eric R Snow
wrote: The three beam scales in school had an aluminum plate that passed between two magnets as the damper. All of my ammunition scales are dampened this way. Except the very old one that uses a revivor of oil and a tiny paddle below the beam Gunner "I think this is because of your belief in biological Marxism. As a genetic communist you feel that noticing behavioural patterns relating to race would cause a conflict with your belief in biological Marxism." Big Pete, famous Usenet Racist |
Magnetic Granite??!!
On Tue, 25 Apr 2006 07:58:21 GMT, Gunner wrote:
On Mon, 24 Apr 2006 17:03:49 -0700, Eric R Snow wrote: The three beam scales in school had an aluminum plate that passed between two magnets as the damper. All of my ammunition scales are dampened this way. Except the very old one that uses a revivor of oil and a tiny paddle below the beam AH! |
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