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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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very small home made generator, need help
Ok it's not a big generator just enough to power a small bulb. I need to
explain this to a class of 6 year old children and keep them form getting lost with other thoughts. ANY GOOD IDEAS or very short descriptions would be a great help. Take a look www.motherearthrecycling.net/gen/gen.htm This is made from 4 rare earth magnets and some shop time. It runs very smooth and lights the LED up nice with a good spin. |
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In article , Waynemak says...
Ok it's not a big generator just enough to power a small bulb. I need to explain this to a class of 6 year old children and keep them form getting lost with other thoughts. ANY GOOD IDEAS or very short descriptions would be a great help. The explaination should be short for six year olds. You just say that you are changing mechanical (muscle) work into electricity, and then into light. I have an old telephone magneto on a board with a big knife switch, and a 7.5 watt bulb in a socket. It's a great demonstration because you can *feel* what seven and a half watts feels like, when you close the knife switch. Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
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O.K. kids, see this loop of wire? It's a closed circle right? Who can
tell me what's happening in this closed circle of wire right now? Any ideas? Ideas follow. Well who said nothing? Well, you're right because nothing is happening inside this loop of wire at the moment. It's just a loop of wire, made up of a bunch of copper atoms. All the copper atoms are just sitting there looking at each other and nothing is happening. Atoms, by the way are the small pieces of copper that exist, so small, you can't even see them in a regular microscope. But here's something really strange, if I take a magnet and pass it through this loop of wire, something starts to happen. Anyone know what that is? You there in the back, pay attention because I was just telling everyone else what Santa Claus is giving you for Christmas. Sorry, I only mention these things once. Who can tell me what happens? Ideas follow. Well, what starts to happen is that these atoms start passing parts of themselves to the atom next to them. Here, each one of you pick up one of these stones I brought along here and get in a circle. Now pretend this stone is part of you. We could call it your arm but you already have one of those, so we'll call it your electron and we'll pretend you're a copper atom in a wire. Ready? Now here's what we're going to do: When I shout "magnet!" each one of you guys is going to take this small stone, and pass it to the person on your right. Who knows which direction right is? (Sort them out) O.K. ready? MAGNET!!!!! Hopefully, all stones move to the right. Now what you've just done is demonstrate what happens when a magnet passes around a wire. Those electrons moving are called..Who can tell me. Tell me and I'll pay you a buck right now. Good. That's right, electricity!!!!!! Now what I've got here is a little device I made to make a whole bunch of magnets go past a loop of wire real fast. It's called a generator. Here you there. Turn this and let's see what happens. See what those moving electrons can do!!!!! Very good, here's a buck. You generated electricity, just like the power company, so I'm paying you just like your folks pay the power company to keep your lights at home on.... Charles Morrill |
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Sounds ok but not sure how many dollars I have. My son liked it but lost
interest in a few minutes. Maybe I was hoping for a more exciting review form him "Charles Morrill" wrote in message news:2004112821573327590%deichles@yahoocom... O.K. kids, see this loop of wire? It's a closed circle right? Who can tell me what's happening in this closed circle of wire right now? Any ideas? Ideas follow. Well who said nothing? Well, you're right because nothing is happening inside this loop of wire at the moment. It's just a loop of wire, made up of a bunch of copper atoms. All the copper atoms are just sitting there looking at each other and nothing is happening. Atoms, by the way are the small pieces of copper that exist, so small, you can't even see them in a regular microscope. But here's something really strange, if I take a magnet and pass it through this loop of wire, something starts to happen. Anyone know what that is? You there in the back, pay attention because I was just telling everyone else what Santa Claus is giving you for Christmas. Sorry, I only mention these things once. Who can tell me what happens? Ideas follow. Well, what starts to happen is that these atoms start passing parts of themselves to the atom next to them. Here, each one of you pick up one of these stones I brought along here and get in a circle. Now pretend this stone is part of you. We could call it your arm but you already have one of those, so we'll call it your electron and we'll pretend you're a copper atom in a wire. Ready? Now here's what we're going to do: When I shout "magnet!" each one of you guys is going to take this small stone, and pass it to the person on your right. Who knows which direction right is? (Sort them out) O.K. ready? MAGNET!!!!! Hopefully, all stones move to the right. Now what you've just done is demonstrate what happens when a magnet passes around a wire. Those electrons moving are called..Who can tell me. Tell me and I'll pay you a buck right now. Good. That's right, electricity!!!!!! Now what I've got here is a little device I made to make a whole bunch of magnets go past a loop of wire real fast. It's called a generator. Here you there. Turn this and let's see what happens. See what those moving electrons can do!!!!! Very good, here's a buck. You generated electricity, just like the power company, so I'm paying you just like your folks pay the power company to keep your lights at home on.... Charles Morrill |
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Waynemak writes:
ANY GOOD IDEAS or very short descriptions would be a great help. Looks like you could also demonstrate the Lenz effect with a hunk of aluminum moved in and out from near those magnets. |
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I did an electricity generating demo for a 2nd grade class that kept their
attention. Took the secondary out of an old ignition coil and found a rare earth magnet that fit loosely inside. After doing the wire/compass/magnet thing I was starting to loose them so I "volunteered" the class loud mouth to hold a couple of wires while I dropped the magnet through the coil. That kept them enthralled for another 10 minutes. -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com "Waynemak" wrote in message ... Ok it's not a big generator just enough to power a small bulb. I need to explain this to a class of 6 year old children and keep them form getting lost with other thoughts. ANY GOOD IDEAS or very short descriptions would be a great help. Take a look www.motherearthrecycling.net/gen/gen.htm This is made from 4 rare earth magnets and some shop time. It runs very smooth and lights the LED up nice with a good spin. |
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On Sun, 28 Nov 2004 19:54:03 -0500, "Waynemak"
wrote: Ok it's not a big generator just enough to power a small bulb. I need to explain this to a class of 6 year old children and keep them form getting lost with other thoughts. ANY GOOD IDEAS or very short descriptions would be a great help. One of the ways to demonstrate the principle and reciprocity of motor- generator is to connect. up two small identical motors to each other. You turn one and the other one turns. You load one with your finger (motor) and it is harder to runt the other (generator) Reverse the leads and the rotation reversed. I have a pair of Maxon motors out of an old tape drive. They are so sensitive that they will respond even to very slow rotation. Floppy drive PM motors not steppers also work well. -- Boris Mohar |
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In article 7dEqd.4085$wa1.2802@lakeread04, Glenn Ashmore says...
I did an electricity generating demo for a 2nd grade class that kept their attention. Took the secondary out of an old ignition coil and found a rare earth magnet that fit loosely inside. After doing the wire/compass/magnet thing I was starting to loose them so I "volunteered" the class loud mouth to hold a couple of wires while I dropped the magnet through the coil. That kept them enthralled for another 10 minutes. Heh. The same effect can be done with a telephone magneto, too. A kid did that in 5th grade, he made a "lie detector" that way. Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
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I had a magneto in the original oak box with a pair of "J" bells on the
box - very old 2-part signalling circuit from early telephone days. On top of the box I mounted a pair of shiny brass screws. On the rear was a couple push switches, not visible from the front. One switch connected the bells to the magneto which would ring when the crank was turned and the other switch connected the magneto to the pair of brass screws. My "electricity demonstration" to the kiddies went like this: "Let's see if you have enough electricity in your body to ring the bells". One kid (maybe the shill) would grab the terminals and sure enough, when I cranked the magneto, the bell would ring as I depressed the appropriate switch on the back. "Now Johnny, you try it" Sure enough the bells would ring again. We'd go like this until the loud mouth's turn came. "Oh, sorry Gizmo, you don't seem to have enough juice to ring the bells. Whyn't you wet your fingers to see if you can get a better connection". Bob Swinney "jim rozen" wrote in message ... In article 7dEqd.4085$wa1.2802@lakeread04, Glenn Ashmore says... I did an electricity generating demo for a 2nd grade class that kept their attention. Took the secondary out of an old ignition coil and found a rare earth magnet that fit loosely inside. After doing the wire/compass/magnet thing I was starting to loose them so I "volunteered" the class loud mouth to hold a couple of wires while I dropped the magnet through the coil. That kept them enthralled for another 10 minutes. Heh. The same effect can be done with a telephone magneto, too. A kid did that in 5th grade, he made a "lie detector" that way. Jim -- ================================================== please reply to: JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com ================================================== |
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Might want to look at www.otherpower.com - this guy has several homemade
wind gennies that might be adaptable to student manufacture and experimentation.. Pat |
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Glenn Ashmore wrote:
I did an electricity generating demo for a 2nd grade class that kept their attention. Took the secondary out of an old ignition coil and found a rare earth magnet that fit loosely inside. After doing the wire/compass/magnet thing I was starting to loose them so I "volunteered" the class loud mouth to hold a couple of wires while I dropped the magnet through the coil. That kept them enthralled for another 10 minutes. Cool - I have a LED flashlight that is just like that, rectify the output dump it into a cap and drive a LED. Works nicely, but shaking the flashlight can wear you out! Martin -- Martin Eastburn, Barbara Eastburn @ home at Lion's Lair with our computer NRA LOH, NRA Life NRA Second Amendment Task Force Charter Founder |
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On Mon, 29 Nov 2004 09:19:17 -0800, "patrick mitchel"
wrote: Might want to look at www.otherpower.com - this guy has several homemade wind gennies that might be adaptable to student manufacture and experimentation.. Pat Thanks for the link , very interesting site of Matt's. Is he on this group? I read about half the site and love the model A truck generator. I almost got a hold of one of those , but someone stabbed me in the back for it. Someday I'll post pictures of it , need to find the booklet for my scanner first cause it defaults or something to TIFF. |
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In article ,
Sunworshipper wrote: On Mon, 29 Nov 2004 09:19:17 -0800, "patrick mitchel" wrote: Might want to look at www.otherpower.com - this guy has several homemade wind gennies that might be adaptable to student manufacture and experimentation.. Pat Thanks for the link , very interesting site of Matt's. Is he on this group? I read about half the site and love the model A truck generator. I almost got a hold of one of those , but someone stabbed me in the back for it. Someday I'll post pictures of it , need to find the booklet for my scanner first cause it defaults or something to TIFF. If the only thing stopping you from shippin' pix is the fact that your scanner saves to TIFF by default, all ya gotta do to get a JPEG is this: 1: Scan whatever it is. Let it save it as a TIFF - All those are is raw image dumps. (Which is why they're so huge) 2: Crack open your favorite tool that can read TIFF and save JPEG. On a Mac, Two good tools for this are GraphicConverter and JPEGView. In the Windows world, the only one I'm personally familiar with is Photoshop, but I've got no doubt whatsoever that there are others. Linux/*nix geeks - you're on your own - I *KNOW* there's something (more probably, several somethings) that will do it, but I haven't yet soaked up enough *nix know-how to name one. 3: Open the TIFF file in the tool you're converting with. 4: Do whatever setup is needed by the program to compress to whatever level you feel works best, then save it off as a *.jpg file. 5: Distribute your shiney new jpeg by the usual methods. 6: There is no step six. -- Don Bruder - - New Email policy in effect as of Feb. 21, 2004. Short form: I'm trashing EVERY E-mail that doesn't contain a password in the subject unless it comes from a "whitelisted" (pre-approved by me) address. See http://www.sonic.net/~dakidd/main/contact.html for full details. |
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In article ,
Don Bruder wrote: In article , Sunworshipper wrote: [ ... ] me in the back for it. Someday I'll post pictures of it , need to find the booklet for my scanner first cause it defaults or something to TIFF. If the only thing stopping you from shippin' pix is the fact that your scanner saves to TIFF by default, all ya gotta do to get a JPEG is this: 1: Scan whatever it is. Let it save it as a TIFF - All those are is raw image dumps. (Which is why they're so huge) Yep -- but also why they are the best if you are dealing with things in B&W line drawings, where the JPEG lossy compression loses detail, especially where two lines intersect at an acute angle. (Also, tiny type gets very difficult to read. :-) 2: Crack open your favorite tool that can read TIFF and save JPEG. On a [ ... Mac & Windows dealt with ... ] but I've got no doubt whatsoever that there are others. Linux/*nix geeks - you're on your own - I *KNOW* there's something (more probably, several somethings) that will do it, but I haven't yet soaked up enough *nix know-how to name one. Yep -- several options. 1) xv (an older one, now, and it wants to be shareware instead of freeware -- but it has the nicest way of browsing a directory full of images. 2) ImageMagik (a suite of programs including several forms of image conversion. This is probably the best way to convert a whole subdirectory full of images, as it can be run from a shell script without having to pop up a display of each. 3) "The GIMP" (The Gnu Image Manipulation Package). Yes, the "The" is part of the program title. Probably the closest thing to PhotoShop, and like PhotoShop, it takes quite a while to master all (or even a reasonable percentage) of its features. 4) For converting tiff to PDF, it is a two-step operation: a) tiff2ps (part of the libtiff package) -- converts TIFF images to PostScript. b) ps2pdf (part of the GNU Ghostscript package), converts the PostScript output from the previous program to PDF files. I've written a shell script to run these in combination to convert a ton of page scans into a single document -- or for some big ones, a PDF file per page, to keep the overall size of the PDF files down. And -- there are probably others, as well. These are just the ones which I know about and use. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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In article ,
Don Bruder wrote: In article , (DoN. Nichols) wrote: In article , Don Bruder wrote: In article , Sunworshipper wrote: [ ... ] me in the back for it. Someday I'll post pictures of it , need to find the booklet for my scanner first cause it defaults or something to TIFF. If the only thing stopping you from shippin' pix is the fact that your scanner saves to TIFF by default, all ya gotta do to get a JPEG is this: 1: Scan whatever it is. Let it save it as a TIFF - All those are is raw image dumps. (Which is why they're so huge) Yep -- but also why they are the best I snipped the rest of the paragraph - 'Cause it didn't need saying in the first place. Why? Well, it's pretty tough to get a lossy compressed image that's better than the original raw data, y'know? Understood. But the other compression systems are *not* lossy, so they are a better choice. And a lot of things (including digital cameras) tend to default to JPG, so you need to know that there is a good reason to select something else. For b&w, particularly line drawings, GIF is *THE* way to go, period. IMO, of course. Except for the problem which kept it out of use in freeware for quite a few years. (It also zapped the use of the "compress" program. The problem is the patenting of the LZW compression algorithm by Unisoft, and the demanding that royalties be paid. As a result, freeware (which had no mechanism for paying royalties) had to drop support for GIF. This includes most unix programs. Only commercial programs are in a position to submit royalty payments. Even now, they have only compression-free versions of GIF in many of the programs. I understand that the patent has finally run out, so GIF may come back into more common use. but I've got no doubt whatsoever that there are others. Linux/*nix geeks - you're on your own - I *KNOW* there's something (more probably, several somethings) that will do it, but I haven't yet soaked up enough *nix know-how to name one. Yep -- several options. Nice catch, Don Thanks! I'll leave the list in place 'cause it's darn good info to have around. O.K. Though I will snip it in this reply -- as people can use Google to recover old articles at need. I'm just starting to get my feet wet, paddling out to sea in a YellowDog Linux install on a 7600 upgraded to G3@300 - I've always been at least "borderline functional" in a *nix shell, but never tried to admin a *nix box. Geek-brag: Until I had to power down for the RAM addition about 2 weeks ago, I had a 38 day uptime on it Does that mean I'm doing a good job running it, or izzit that it's doing a good job of gracefully catching my screwups? Well ... it is in part that you have done nothing to *cause* problems, at least. Often, the best thing to do is *nothing* -- until something really *needs* doing. Obviously, regular backups are a necessary thing. Beyond that, you should only need to reboot if you make hardware changes. Observe a subset of my systems: ================================================== ==================== ceilidh up 325+02:07, 1 user, load 0.04, 0.09, 0.14 popocat up 334+04:27, 0 users, load 0.10, 0.02, 0.01 twenty20 up 224+19:30, 0 users, load 0.01, 0.01, 0.01 ================================================== ==================== One (popocat) is still running SunOs 4.1.4 (the last BSD flavored version of SunOs from several years ago. (I installed it September 29th 1999.) It is a SS-10 with two dual CPU boards, for a total of four (quite slow -- 35 MHz) CPUs. That longest uptime would have been longer, if it were not for a power outage longer than the UPS batteries could handle. :-) Ceilidh (a SS-10) is running Solaris 2.6 (SunOs 2.6). Dual 50 MHz CPU, Twenty20 is a SS-20, with dual CPUs, running Solaris 2.8. ================================================== ==================== stromboli up 3+14:52, 1 user, load 0.03, 0.01, 0.01 ================================================== ==================== The uptime on the last one is so short because it has memory which is a bit marginal on speed, and reboots spontaneously when there is a memory error. Here is the error report from /var/log/syslog: ================================================== ==================== Nov 28 03:16:59 stromboli unix: [ID 836849 kern.notice] Nov 28 03:16:59 stromboli panic[cpu0]/thread=f683d0a0: Nov 28 03:16:59 stromboli unix: [ID 166057 kern.notice] asynchronous memory fault:\ MFSR=81804860 MFAR=39c8c1c Nov 28 03:16:59 stromboli unix: [ID 100000 kern.notice] ================================================== ==================== I probably should translate that into a notification of which SIMM is bad, and swap it out. But it only happens about once every few months -- usually when I am asleep, and it reboots cleanly. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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