Making Anti-gravity tubes - Copper & Silver! - Lenz's law - Metal casting Experiment

have you ever seen this this is a copper tube and this is a powerful neodymium magnet if I drop the magnet through the tube it takes a long time to get to the bottom What's Happening Here is as the magnet falls through the tube an electrical current is being generated and that creates an opposing magnetic field that slows the rate of the magnet this is called lenses law and I'm no physicist but I believe this is how almost all electricity is generated if you haven't tried this yourself you really should it's very interesting it's really bizarre watching this thing just float down to the bottom this works really well with copper because copper has an extremely low resistance but the metal that has an even lower resistance is silver and I happen to have quite a bit left over from previous projects one of my viewers suggested that I use some of this silver to make a silver tube and see how well it slows down a magnet I thought this was a really great idea so in today's video I'll be casting a thick silver tube and copper tube and we're going to experiment to see which which one works better unfortunately the silver that I have is not pure it's Sterling which is 92 1/2% silver and 7 1/2% copper I have no idea if this will matter but we're going to find out a tube is a fairly easy object to cast and there are a bunch of different ways I could do it but I figure that my usual lost PLA and ceramic shell method is the best way to go first I 3D printed some tubes in a plastic called pla now I can start dipping the models into this liquid cam IC material called suspendus slurry to start creating a mold over about a week I built up a thick Shell by dipping the models into the slurry about eight times in between each layer except for the first I coated the wet slurry with fused silica sand this helps build up a thicker shell and it also adds some strength with the shells nice and dry now I can place them inside my kiln and start to burn out the plastic oddly at about 200° f one of the shells cracked really badly but the other one was totally fine I have no idea why this happened but I had to fix the crack so I let it cool down for a little bit and then I patched it with some slurry and some fiberglass cloth I was able to get the shell fixed and back into the Kil in about 45 minutes which is pretty cool now all I can do is hope that the repair hold Ms and bring up the temperature to the melting point of the PLA and let it flow out of the shells while that was heating up I started to prepare some copper to melt once most of the pla had flowed out of the shells I removed it and cranked up the temperature in the Kiln to around 1500° F this Burns away the rest of the the plastic and vitrifies the shell turning it into a durable ceramic that I can pour molten metal into once all of the plastic was completely burned away I used an air compressor to blow out any ash left in the Shell which could affect the quality of the castings once the metals were at the right pouring temperature I removed the shells from the Kiln placed them inside an old Crucible and surrounded them with sand to keep them from falling [Music] over after pouring the copper mold I swapped out the crucibles and started to melt the silver the furnace was still really hot so the silver didn't take any time at all to melt once the shells were cool enough to handle I started breaking them apart I was a little bit surprised to see that there's actually some shrinkage in the metal which is caused by the metal Contracting as it cools I expected some shrinkage but not this much it really isn't a problem though and it shouldn't affect how well they work the sand blaster is the best way to remove the shell from the inside of these tubes without it it would be almost impossible to remove it I do have a metal cutting Band Saw but I wanted a little bit more control so I ended up cutting all these by hand which was quite a bit of work with that done now I can Chuck them up into my lathe and clean them up a bit I wasn't doing any precise Machining here here I just wanted to clean them up a little bit and make them look a little [Music] [Music] nicer now I can start cleaning up the inside and outside surfaces and for that I used a die grinder as a final step I remov the marks left by the die grinder by using my new 2x 42in belt grinder with a scotchbrite belt on it and that did a really good job well they're finally done so let's see how well they work this is a 25mm n52 neodymium magnet it's actually really strong doesn't look like it would be but it is that's a steel screwdriver it's really on here has a really strong pull Force actually all right let's give it a shot wow that is so weird just floats down there strange okay let's try this over oh well that's actually worse than the copper must be because it's Sterling yep that definitely goes through the tube the silver tube faster than the copper weird definitely faster wow I did not see that coming at all oh well it was an interesting experiment and I made uh I cut them in half so that you can kind of drop them through like this one after another there you go oh it feels strange if you if you push the ball up through the tube it's like it's molasses or something that's weird yeah there's resistance going up and coming down that's strange wow oh and I can I can feel the weight of the ball as it's falling through the tube even though it's not touching the sides that's really bizarre it's as if the ball is placed on the tube I can feel the weight of the magnet but it's not actually touching the copper tube at all all that's strange what else can we do how about like this that's cool it like breaks that's bizarre well this project was a lot of fun and I really like how these things turned out thanks to the viewer who suggested this to me it's too bad the silver didn't work out really but it was a fun experiment I'm definitely going to be reusing this silver so if any of you have any suggestions let me know I'm not quite done with this project yet I'm actually going to make another copper tube this thing's going to be huge and I got some great big neoi magnets look at that so I think this project is going to be a lot of fun this magnet is massive and this thing's going to be almost 20 lb hey if you like this video and you'd like to help me continue to make them then consider joining my patreon you'll gain access to any of my 3D printing files and I try to post multiple patreon only posts a week there well thanks for watching and I'll see you next time

Channel: Robinson Foundry

Views: 922,754

Keywords: casting metal, 3d printing, chris ramsay, melting metal, robinson foundry, maze bolt, difficult maze, silver casting, lenzs law, eddie currents, eddy currents, neodymium magnets, rare earth magnets

Id: VIV3NqSDjAg

Length: 11min 21sec (681 seconds)

Published: Fri Dec 22 2023