{"id":114786,"date":"2025-06-25T16:31:20","date_gmt":"2025-06-25T14:31:20","guid":{"rendered":"https:\/\/xometry.pro\/stories\/practical-engineer-exploring-magnetic-couplings\/"},"modified":"2025-06-25T16:40:38","modified_gmt":"2025-06-25T14:40:38","slug":"practical-engineer-exploring-magnetic-couplings","status":"publish","type":"stories","link":"https:\/\/xometry.pro\/en-uk\/stories\/practical-engineer-exploring-magnetic-couplings\/","title":{"rendered":"Exploring Magnetic Couplings: No Gears, No Belts, Just Magnets"},"content":{"rendered":"<div role=\"navigation\" aria-label=\"Table of Contents\" class=\"simpletoc wp-block-simpletoc-toc\"><h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#h-why-build-a-motor-with-no-contact\">Why Build a Motor With No Contact?<\/a>\n\n<\/li>\n<li><a href=\"#from-cad-sketch-to-copper-and-magnets\">From CAD Sketch to Copper and Magnets<\/a>\n\n\n<\/li>\n\n<li><a href=\"#realworld-potential\">Real-World Potential<\/a>\n\n<\/li>\n<li><a href=\"#whats-next\">What\u2019s Next?<\/a>\n<\/li><\/ul><\/div>\n\n\n<p>As an aerospace engineering graduate with a passion for hands-on design, I spend most of my time experimenting and building functional things. Through my <a href=\"https:\/\/www.youtube.com\/thepracticalengineer\" target=\"_blank\" rel=\"noreferrer noopener\">YouTube channel<\/a>, I share engineering challenges like this one to inspire others to get creative and start building themselves.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-build-a-motor-with-no-contact\"><strong>Why Build a Motor With No Contact?<\/strong><\/h2>\n\n\n<p>I\u2019d heard of magnetic couplings before, mainly in the context of stirrers at the bottom of lab beakers, where the spinning magnetic field drives a tiny bar in a sealed container. But I had never built one myself.<\/p>\n\n\n\n<p>It seemed like the perfect hands-on challenge: how strong and functional could these non-contact connections actually be? Could I spin a shaft with nothing but magnetic force \u2014 and could I control it?<\/p>\n\n\n\n<p>As I was researching different setups, I stumbled upon a curious variant that didn\u2019t rely on a second magnet at all. Instead, it used a solid copper plate and rotating magnets to generate motion. That\u2019s when the real excitement began.<\/p>\n\n\n\n<p>This setup makes use of eddy currents \u2014 swirling loops of electric current induced in conductors, which in turn generate opposing magnetic fields. It\u2019s the same principle behind magnetic braking in roller coasters or high-speed trains.<\/p>\n\n\n\n<p>My goal was simple: build both versions, test them, and get a feel for the forces involved.<\/p>\n\n\n<div id=\"6mQ9z60-kQ4-69dcb10036dfb\" data-video-id=\"6mQ9z60-kQ4\" class=\"ma-gdpr-youtube-wrapper\" style=\"width:100%;height:56.25%;padding-top:56.25%;\" data-new-window=\"\" data-yt-parameters=\"WyJtYXgtd2lkdGg9XHUyMDFjNzAwcHhcIiJd\"><picture class=\"ma-gdpr-youtube-thumbnail\"><source media=\"(min-width:640px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_hq720.webp\"><source media=\"(min-width:640px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_hq720.jpg\"><source media=\"(min-width:320px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_sddefault.webp\"><source media=\"(min-width:320px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_sddefault.jpg\"><source media=\"(min-width:240px)\" type=\"image\/webp\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_hqdefault.webp\"><source media=\"(min-width:240px)\" type=\"image\/jpeg\" srcset=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_hqdefault.jpg\"><img decoding=\"async\" src=\"\/\/xometry.pro\/wp-content\/uploads\/ma-gdpr-youtube-thumbnails\/6mQ9z60-kQ4\/6mQ9z60-kQ4_mqdefault.jpg\" alt=\"\" title=\"\"><\/picture><svg class=\"ma-gdpr-youtube-button\"><use xlink:href=\"#ma-gdpr-youtube-play-button\"><\/use><\/svg><div class=\"ma-gdpr-youtube-notice\" style=\"font-size:.7em;\"><\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"from-cad-sketch-to-copper-and-magnets\"><strong>From CAD Sketch to Copper and Magnets<\/strong><\/h2>\n\n\n<p>Everything started as a sketch in Fusion 360. I modeled two rotating disks, each holding six neodymium magnets in alternating polarity: north pole up on one disk, south pole up on the other. The idea was that when one disk spun, magnetic forces would transfer that motion to the other.<\/p>\n\n\n    <section class=\"article-slider-block\">\r\n        <div class=\"article-content-wrapper\">\r\n            <!-- Swiper -->\r\n            <div class=\"swiper mySwiper2 article-slider-display\">\r\n                <div class=\"swiper-wrapper\">\r\n                                                <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cad-model-copper-disk.png\" alt=\"CAD model of the copper disk, designed in Fusion 360 to interact with the magnetic coupling.\u00a9\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cad-model-copper-disk.png\" data-fancybox=\"gallery\" data-caption=\"CAD model of the copper disk, designed in Fusion 360 to interact with the magnetic coupling.\u00a9\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cad-model-copper-disk.png\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"CAD model of the copper disk, designed in Fusion 360 to interact with the magnetic coupling.\u00a9\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                    <p>CAD model of the copper disk, designed in Fusion 360 to interact with the magnetic coupling.\u00a9<\/p>\n                                <\/div>\r\n                            <\/div>\r\n                            \r\n                                                        <div class=\"swiper-slide\">\r\n                                <div class=\"wp-block-image__wrap\">\r\n                                    <img decoding=\"async\"  src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cnc-machined-copper-disk-scaled.jpg\" alt=\"The CNC-machined copper disk \u2014 delivered by Xometry with a clean bead-blasted finish.\u00a9\"\r\n                                    >\r\n                                    <a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cnc-machined-copper-disk-scaled.jpg\" data-fancybox=\"gallery\" data-caption=\"The CNC-machined copper disk \u2014 delivered by Xometry with a clean bead-blasted finish.\u00a9\" aria-label=\"Open full image\">\r\n                                        <img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cnc-machined-copper-disk-scaled.jpg\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"The CNC-machined copper disk \u2014 delivered by Xometry with a clean bead-blasted finish.\u00a9\" loading=\"lazy\" decoding=\"async\">\r\n                                        <svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n                                            <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"><\/path>\r\n                                        <\/svg>\r\n                                    <\/a>\r\n                                <\/div>\r\n                                <div class=\"article-slider-text\">\r\n                                    <p>The CNC-machined copper disk \u2014 delivered by Xometry with a clean bead-blasted finish.\u00a9<\/p>\n                                <\/div>\r\n                            <\/div>\r\n                            \r\n                                            <\/div>\r\n            <\/div>\r\n            <div thumbsSlider=\"\" class=\"swiper mySwiper article-slider-list\">\r\n                <div class=\"swiper-wrapper\">\r\n                                            <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cad-model-copper-disk.png\" alt=\"CAD model of the copper disk, designed in Fusion 360 to interact with the magnetic coupling.\u00a9\">\r\n                        <\/div>\r\n                                                <div class=\"swiper-slide\">\r\n                            <img decoding=\"async\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-cnc-machined-copper-disk-scaled.jpg\" alt=\"The CNC-machined copper disk \u2014 delivered by Xometry with a clean bead-blasted finish.\u00a9\">\r\n                        <\/div>\r\n                                        <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n    \n\n\n<p>I 3D printed the housings using my Bambu Lab printers and sourced the copper plates from Xometry.&nbsp;<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"version-1-magnet-vs-magnet\"><strong>Version 1: Magnet vs Magnet<\/strong><\/h3>\n\n\n<p>This version used two identical magnetic disks placed face to face. When one disk spun, the magnetic field pulled the second one into rotation with it. The coupling was surprisingly strong and extremely responsive.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-aligning-magnet-disks.gif\" alt=\"Aligning the magnet disks during assembly \u2014 alternating poles create the magnetic link.\u00a9\" class=\"wp-image-114732\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-aligning-magnet-disks.gif\" data-fancybox=\"gallery-114786\" data-caption=\"Aligning the magnet disks during assembly \u2014 alternating poles create the magnetic link.\u00a9\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-aligning-magnet-disks.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Aligning the magnet disks during assembly \u2014 alternating poles create the magnetic link.\u00a9<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-assembling-magnetic-coupler.gif\" alt=\"Assembling the magnetic coupler \u2014 magnets face each other in alternating polarity.\u00a9\" class=\"wp-image-114744\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-assembling-magnetic-coupler.gif\" data-fancybox=\"gallery-114786\" data-caption=\"Assembling the magnetic coupler \u2014 magnets face each other in alternating polarity.\u00a9\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-assembling-magnetic-coupler.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Assembling the magnetic coupler \u2014 magnets face each other in alternating polarity.\u00a9<\/figcaption><\/figure>\n\n\n\n<p>However, the connection was rigid, too rigid. If anything jammed or encountered resistance, the entire system halted. There was no slip, which is great for torque transfer, but not ideal in applications where flexibility or safety is needed.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"version-2-magnet-vs-copper-plate\"><strong>Version 2: Magnet vs Copper Plate<\/strong><\/h3>\n\n\n<p>This is where it got really exciting. When I spun the magnetic disk near the copper plate, the plate started to rotate, without touching anything. That\u2019s the magic of eddy currents in action.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/ractical-engineer-moving-neodymium-magnet-close-to-copper-plate.gif\" alt=\"Though copper isn\u2019t magnetic, the falling magnet slows slightly as eddy currents create resistance just before contact.\u00a9\" class=\"wp-image-114756\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/ractical-engineer-moving-neodymium-magnet-close-to-copper-plate.gif\" data-fancybox=\"gallery-114786\" data-caption=\"Though copper isn\u2019t magnetic, the falling magnet slows slightly as eddy currents create resistance just before contact.\u00a9\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/ractical-engineer-moving-neodymium-magnet-close-to-copper-plate.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">Though copper isn\u2019t magnetic, the falling magnet slows slightly as eddy currents create resistance just before contact.\u00a9<\/figcaption><\/figure>\n\n\n\n<p>It felt like turning a paddle through honey. The connection was smooth, resistant, and self-regulating. The faster the magnets moved, the stronger the induced currents and torque. The closer the magnets were to the plate, the more force they could transfer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class=\"wp-block-image__wrap\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-copper-plate-begins-spinning.gif\" alt=\"The copper plate begins spinning \u2014 driven only by the magnetic field and eddy currents.\u00a9\" class=\"wp-image-114768\"\/><a class=\"wp-block-image__fancy-box-button\" href=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-copper-plate-begins-spinning.gif\" data-fancybox=\"gallery-114786\" data-caption=\"The copper plate begins spinning \u2014 driven only by the magnetic field and eddy currents.\u00a9\" aria-label=\"Open full image\"><img src=\"https:\/\/xometry.pro\/wp-content\/uploads\/2025\/06\/practical-engineer-copper-plate-begins-spinning.gif\" class=\"wp-block-image__fancy-box-button-thumbnail wp-post-image\" alt=\"\" loading=\"lazy\" decoding=\"async\"><svg class=\"wp-block-image__fancy-box-button-icon\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" fill=\"none\" aria-hidden=\"true\">\r\n               <path d=\"M0 2V6H2V2H6V0H2C0.895 0 0 0.895 0 2ZM2 12H0V16C0 17.105 0.895 18 2 18H6V16H2V12ZM16 16H12V18H16C17.105 18 18 17.105 18 16V12H16V16ZM16 0H12V2H16V6H18V2C18 0.895 17.105 0 16 0Z\" fill=\"#092C47\"\/>\r\n             <\/svg><\/a><\/div><figcaption class=\"wp-element-caption\">The copper plate begins spinning \u2014 driven only by the magnetic field and eddy currents.\u00a9<\/figcaption><\/figure>\n\n\n\n<p>Too far, and the coupling weakened. Too close, and the system tried to pull itself forward. The effect was surprisingly strong \u2014 even with a gap of over 8mm, the interaction still worked.<\/p>\n\n\n\n<p>One thing that amazed me: the copper setup also worked in reverse. When I spun the copper plate, it started rotating the magnet disk. I didn\u2019t expect that.<\/p>\n\n\n\n<p>I even tried different thicknesses \u2014 a 6mm plate versus a 3mm one. The thinner one responded faster, likely due to its lower inertia.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"realworld-potential\"><strong>Real-World Potential<\/strong><\/h2>\n\n\n<p>Could this have real-world applications? Definitely.&nbsp;<\/p>\n\n\n\n<p>Think about situations where you need to drive a shaft through a sealed wall \u2014 for example, in chemical processing, underwater systems, or food production lines. These environments benefit from non-contact torque transfer, since there\u2019s no risk of contamination or leaks.<\/p>\n\n\n\n<p>The copper version\u2019s natural slip could even act as a safety feature \u2014 providing soft starts or disengaging when overloaded.<\/p>\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"whats-next\"><strong>What\u2019s Next?<\/strong><\/h2>\n\n\n<p>If I build a next version, I\u2019d design a system that lets me adjust the spacing between the magnet disk and the copper plate on the fly. That way, I could fine-tune the amount of torque transferred.<\/p>\n\n\n\n<p>I\u2019d also like to try out different magnet configurations or materials, maybe even turn this into a real-world application.<\/p>\n\n\n\n<p>For now, I\u2019m just glad I gave the copper version a shot \u2014 even though I didn\u2019t believe in it at first. Turns out, sometimes the best results come from the ideas you doubt the most.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-alpha-channel-opacity has-background\" style=\"background-color:#f5f7f8;color:#f5f7f8\"\/>\n\n\n\n<p><strong>Want to see it in action? Check out the full video on my channel. <\/strong>And if you\u2019ve got an idea for where magnetic couplings could be useful, I\u2019d love to hear from you.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"author":50,"featured_media":114700,"comment_status":"open","ping_status":"closed","template":"","c-tag-stories":[2102],"global-tag":[476],"class_list":["post-114786","stories","type-stories","status-publish","has-post-thumbnail","hentry","c-tag-stories-hobby-en-uk","global-tag-cnc-machining-uk"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Exploring Magnetic Couplings: No Gears, No Belts, Just Magnets | Xometry Pro<\/title>\n<meta name=\"description\" content=\"What if I told you I could spin a propeller without touching it? No gears. No belts. Nothing but magnets. Sounds like science fiction, right?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/xometry.pro\/en-uk\/stories\/practical-engineer-exploring-magnetic-couplings\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exploring Magnetic Couplings: No Gears, No Belts, Just Magnets | Xometry Pro\" \/>\n<meta property=\"og:description\" content=\"What if I told you I could spin a propeller without touching it? No gears. No belts. Nothing but magnets. 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