Introduction: Top That Spins Forever!

Picture of Top That Spins Forever!

Intro:

As an avid Instructables reader and a part time inventor, I have always wanted to make some of my own Instructables to share some of my ideas, but never got around to it. Finally, with a little incentive from the First Time Author contest, I bring to you: a top that can spin FOREVER!

See video, soon to be embeded!

***Author's note: YouTube removed my first video for being flagged "repetitive" by their system, but once they review my appeal I will embed the video. Additional videos were not uploading until the first is cleared.***


If you are just interested in reading through how to make it, skip to step 2: The Base!!!


Theory of Operation:

The Top that Spins Forever consists of two parts, a spinning top and a base. The top contains a magnet hidden under the surface of the plastic, and the base contains a motor holding a magnet. The top continues to spin because the magnet inside the top wants to align with the spinning magnet inside the base.

Why do the magnets "want" to align? A full explanation of how magnets work would be beyond the scope of this Instructable, but an excellent resource is How Stuff Works. If you imagine the magnetic field of each magnet leaving the north pole and curling around through the air to the south pole, anything in this field that makes it easier for the field to travel from North to South feels "attracted." If the magnets face opposite directions, they assist each other's fields and are in a stable position. If they face the same direction, the north pole of one pushes the field from the north pole of the other away. In this situation, if one magnet is free to spin, it will. The magnets will naturally align north to south. See image of magnets.

Because the magnets align, if they start aligned in opposite but parallel directions and you turn one slightly clockwise, the other will be pushed to turn clockwise as well. As naturally follows, if you have a top which a user spins, as long as you have a magnet underneath spinning in the same direction at the same speed, the top will keep its speed.


Goal of Instructable:

In the coming steps, my goal is to deliver clear, well documented, and decently photographed steps of how to build the simplest version of the Top that Spins Forever that I could devise given the time constraint of the contest. If you find the design interesting, whether or not you end up constructing it, I recommend you vote for me in the First Time Author and Plastics contests. If I see community interest from you brilliant friends I have never met, I would love to post two follow up Instructables:

  • How to design your own top in FreeCad that spins forever
  • How to make an intelligent speed controller for your top that spins forever

But I will judge interest on favorites, votes, and comments. If I win a camera out of it, that means better pictures for my next post!

Notes:

For young inventors:

When I was younger, I would read warning labels as opportunities for fun. I never cared much about the little warning statements people posted, figuring that was for people even newer than I was to the topic. Looking back, I had a number of close calls and accidents that would have been easily preventable if I had listened. For this, anything with a blade or heater of any kind is inherently dangerous. Bring your parents into your creating process. Not only should they be happy to help to make sure you stay safe, showing them how excited you are to begin your pre-engineering work might make them want to put a little more money into it, which means more projects for you!

For all inventors:

If you are not sure if you can do a step safely, ask. Instructables has an incredible community that is more valuable than any individual Instructable or contest. Take advantage of it. I will not be responsible for any injury, death, or property damage from your proper or improper execution of my instructions, so take care of yourself.

Step 1: Materials

Picture of Materials

Required:

  • 3D printer
    • your own
    • your local library
    • purchase parts from 3D printing service like Shapeways
  • Small motor
    • like these from Amazon. Choose whichever you would like, but if you want to use my models for the plastics you will need one of the same form factor, and if you would like to use my simple circuit you will need one that runs on up to 3v DC.
      • $14.99 for 15, or like half that for one. I went with the option of getting extras.
  • 25 - 100 ohm rheostat
    • from your scrap pile or like this one from Amazon
      • $10.41 for 1
  • Knob
  • A switch
    • Like this one from Amazon. If you want to use my plastics you will want one remotely similar to the switch linked, if you know how to modify the model use what you have on hand!
      • $10.59 for 20, you need one.
  • STRANDED wire
    • 22 gauge should be fine. Once again, here it is on Amazon.
      • Why stranded? With a motor involved, you naturally will have a decent amount of vibration. Over time, the single wire in the solid core will break and your performance will be intermittent at best. Stranded core wire can have every single conductor broken over the length of the wire, but still function because others cover the slack in those broken areas.
        • $10.35 for 100', you will likely need less than one foot
    • Magnets
      • Amazon can deliver them right to your door! 8mm diameter, 3mm thick.
        • $7.61 for 35 of them. You need two, buy plenty of extras if you plan to design your own top. They are fun to have on hand!
    • Epoxy
      • Like this from Amazon
        • $5.41 for a tube
    • AA batteries
    • AA battery holder
      • like this from Amazon
        • $9.99 for 5 - there are cheaper options but those had only a few left or did not have prime as an option. Feel free to find a different one that is the same approximate size. Together we can make it work <3.

    Optional:

    • Metal tip for top
      • All you need is a hanger, a drill, a hack saw, and sand paper! Instructions in a later step.

    Pricing:

    See the image for pricing information, but excluding the printing supplies this project will cost you $16 per top. If you do not have anything on hand and choose my recommendations on what to purchase (in bulk), it will cost a hefty $76.

    To Print:

    • No metal tip:
      • Base
      • Magnet Holder
      • Spin Surface
      • Top Base No Tip
      • Top Top No Tip
    • Metal tip (better performing)
      • Base
      • Magnet Holder
      • Spin Surface
      • Top Base Metal Tip
      • Top Top Metal Tip

    Get your prints going early so you can get on to the building!

    **Update 9/25/2017 - 3D models update coming soon!**

    Step 2: The Base

    Picture of The Base

    The base is the magic behind the machine. Without the base, nothing would add back the energy lost to friction and the top would topple. Let's test that the parts fit together and then proceed with final assembly!

    Test Fit Time

    Let's check the fit of your freshly printed base, top of base, and magnet mount. Gather the following:

    • Motor
    • Switch
    • Rheostat
    • Knob
    • One Magnet

    The dimensions were designed to be printed on the not-so-great Dremel 3D20 printer so your prints may be loose. A little loose is okay, we will be putting some epoxy in there to seal things up. If your printer prints holes too big instead of too small like mine, some parts may not fit, and if you do not know how to modify the 3D model I would be glad to help if you request in the comments (and vote!!). One of the toughest parts to get to fit is the motor into the base, so let's test that first. Take your motor and place it into the holder in the middle of the base. For me, I ran into issues in early iterations of my printer messing with the interior hole dimensions, so I had to use a heat gun or hair drier to soften the plastic to get the motor to slide in. The key is to not hold the heat on too long. Keep checking the malleability of the plastic to avoid it just sagging completely out of shape. I changed the dimensions to prevent this, but I figured better to know the solution just in case. Once it fits, smile. You are one step closer to the coolest toy ever.

    Remove your motor and have the magnet mount in hand. Slide the small hole end of the magnet mount onto the motor, and slide the magnet into the magnet mount. Everything should fit in and not wobble too much, but a little is okay. Disassemble this and place the parts aside.

    Take the base and test fit the switch and the rheostat. They should seat nicely and the rheostat's tab should fit through the square hole with a little wiggling. While you are at it, screw the ring bolt onto the rheostat to hold it in place and put the spin surface on top. Seeing things look closer to finished is always something that excites and inspires me.

    Disassemble everything, using a paperclip or pointy thing to pull the spin surface off of the base. I left a little hole in the side of the box to pry it out from underneath. If it takes a lot of work to get out, use some sand paper to trim down the size of the spin surface.

    Epoxy Time

    Before we glue, let's prepare the spin surface. Get some sand paper (~200 grit) and smooth off the bumps from ascending layers on the spin surface. We will coat it with a little epoxy to make a smooth spinning surface. Read that out loud ten times fast.

    Once you know everything will fit and have the spin surface prepared, mix up some epoxy. I highly recommend mixing right on a paper pad so that you can tear off the layers soaked with epoxy for easy cleanup. Mix enough to glue the magnet holder and to cover the spin surface with a thin layer. Add a tiny dab of glue in the motor shaft hole and push it onto the motor until just before the tip of the shaft invades the magnet's housing area. Add a little more glue to the magnet side and slide the magnet on in. Be careful putting this near anything metal! The magnet could pull out of the glue. Set it aside in a way that will allow the glue to set with everything aligned. I used a woodworking clamp to gently hold the motor, but pinching it between two things on your desk should be sufficient. Using either an acid brush with trimmed hairs (which I keep on hand, I trim the horse hair with scissors) or a small corner of cardboard, smooth a bit of epoxy onto the spin surface. No need to go super thick, that will make it bumpy. I recommend two coats with a gentle sanding in between (200 grit is still fine). I waited about 20 hours for the glue to be nice and hard before sanding, but that depends on how fast the epoxy you choose dries in your environment. With two coats, the surface should be glassy and smooth.

    Feel free to work on the top while you wait for the glue to dry!

    Circuit Time

    Get stuff out:

    • Switch
    • Rheostat
    • Motor with dried epoxy
    • Base
    • AA batteries
    • Battery holder
    • Knob
    • Stranded wire
    • Solder
    • Soldering iron
    • Hot glue gun

    I attached an image of the circuit. Give it a look. A note to the professionals: If you know circuitry well enough to do it without my guidance, be sure not to solder the switch on without running the wires through the hole that holds the switch (see steps 6-7). If you were to, you would have to desolder it to put it in place correctly.

    Back to the instructions:

    1. Plug in your soldering iron and hot glue gun.
    2. Loop the tip of the black wire from the battery holder through the right terminal of the motor. Add a dab of solder. NOTE: FOR LEFT HANDED OPERATION, SWITCH THE LEFT AND RIGHT MOTOR WIRES.
    3. Cut a segment of stranded wire from your spool that is about 4 in (10 cm), stripping a little under a half an inch (1 cm) off either end.
    4. Loop one end into the left terminal of the motor and the other into the right terminal of the rheostat. Solder both. This orientation will make a clockwise turn increase the speed.
    5. Cut another segment of wire around the same length (or slightly longer if you are new to soldering)
    6. Trim both ends again, feeding only one end through the middle terminal of the rheostat. Solder it on. Leave the other end of wire unsoldered for now.
    7. You now should have everything but the two wires for the switch soldered together. Put everything into the base except for the switch.
    8. Take the two loose wires and feed them through the hole that will hold the switch. Solder one to the switch's top terminal, and the other to the switch's middle terminal.
    9. You should now have everything soldered together and the switch hanging out of the box by its wires. Slide the switch into its hole with both wires closer to the up position. This will make the "up" position "on" for the circuit.
    10. Screw the rheostat into place and attach the knob to the tip.
    11. Install batteries into the battery holder.
    12. Flip the switch and turn the knob clockwise. The motor should spin! If so, turn off the switch. If not, check your wiring and then post an angry comment below.
    13. Add a dab of hot glue to the switch to hold it, taking care not to get any on the sliding parts inside. Add another dab to hold the motor in place.
    14. I used hot glue to hold the battery holder in place, which you can do too. Just be sure to not use too much, you will need to pop it out and re-glue to change the batteries if you used a holder like the one I used.

    Excitement and Testing

    You did it!!! You should have a working system. Here is how to test that it will work once the top is ready:

    1. Place the spin surface on the completed base.
    2. Take the remaining magnet that we will use for the top and place it on its thin curved side right in the middle of the spin surface.
    3. Flip the switch and turn the knob up until the motor begins to spin. The magnet should spin with it!

    See the video for an example.

    Step 3: The Top

    Picture of The Top

    The beauty of an Instructable is that you can make any modifications you want when building your copy because it is simply a guide to success as opposed to the only way to succeed. That is as true as ever in this Instructable. I will provide two options for the top, one as simple as I could design it, and one designed to last a little longer. I will provide .stl files (stereo lithography files, commonly used for 3d printing) for if you would like to print off a copy of what I made, but I will also leave enough information on the design process for someone of a moderate 3D modeling skill level to design and construct their own.

    If you would like more detailed instructions for designing your own top, aimed at someone who has never 3D modeled, vote for me in the contests and comment that you would like that. With community interest I gladly will create an Instructable.

    Simple Top Design:

    If you are looking for the simplest mechanical construction, or just want a simple build to test out the function, this option is for you. Remember that you can always make more tops!

    Supplies:

    1. One magnet
    2. Epoxy
    3. 3D printed parts

    First, clean up your printed parts as necessary, and slide the magnet in to make sure it fits. Test fit the spin rod, sliding into the hole on top of the magnet. With my printer, it does not quite fit. I use a blade or sand paper to cut it down a tiny bit; it is better to have a fit you have to push a little than to have it too loose. Once you know you can get it to go in, remove it.

    Use any metal object to get the magnet back out. Mix your epoxy (I recommend doing so on a pad, preferably not an iPad. This way you can peel off a layer when done!) and put some into the magnet holder area.

    Long Lasting Top Design:

    The issue with making a top completely from 3D printed plastic is that the tip can wear away pretty quickly. Luckily, I have a solution for this. If you make a metal tip that you can insert into the bottom of the 3D printed part, it will last significantly longer.

    Supplies

    1. One magnet
    2. Epoxy
    3. 3D printed parts (with hole in tip)
    4. Wire hanger
    5. Drill
    6. File (or sand paper)
    7. Hack saw

    First, cut a 0.15 in (4 mm) section of metal hanger. To do this, I recommend cutting off the entire straight section of the hanger and putting the rest aside. When using the hack saw on the hanger, be careful not to bang your finger with the falling saw, mine is pretty heavy and would surprise me when it broke through the first few times I made it. Also, I do not recommend using wire cutters you care about to cut the top. They are usually designed for copper and will dent if used to cut steel.

    Next, take that small section and close the teeth of a drill around one end, leaving half sticking out of the teeth. With your file or sand paper, spin the hanger tip against the rough surface to form it into a dull point. Too pointy and it can scratch surfaces you use it on, too dull and it will slow down faster. Take your time and rock the drill slowly to get a bit of a curve on the tip.

    Once to an acceptable point, remove the tip from the drill. Test fit it in the bottom section of the top; if it slides in you can skip the next step.

    Assuming it does not slide in easily, you will need to heat it a little to get it to melt it's way in. This will allow it to

    Follow the simple path instructions for assembly of all but the tip of the long lasting top.

    Step 4: How to Use & Other Fun Stuff

    Picture of How to Use & Other Fun Stuff

    So you made the next coolest toy... Now what? If you ask me, it is pretty useless if you do not know how to use it!

    How to Use:

    1. Spin the top clockwise between your thumb and pointer finger. Lefties have to spin it backwards, which can feel awkward. If the motor is hooked up in reverse polarity it switches this around and makes it easier for lefties.
    2. Once you get a good spin, you may need to tilt the base to get the top to slide to the center, right over the magnet.
    3. Flip the switch and turn the knob clockwise until you hear the motor turn on.
    4. Turn the knob counter-clockwise to slow the motor down until it has almost stopped. You should hear it change tone when it syncs up with the top spinning above it. This may take a few tries.
    5. Slowly increase the speed by turning clockwise until the top is spinning stably at decently fast pace, likely a little faster than you would spin it by hand.

    You have done it! Congratulations. Show all of your friends and your cool neighbor who likes to build stuff.

    You can increase the speed beyond this, but the top will eventually become out of sync with the motor and you will hear the motor jump way up in speed. I enjoy getting it going super fast and then dumping it off the platform onto a surface I do not mind scratching and watching it spin.

    Tricks I Have Learned:

    I have found a few fun tricks to do with the top over the weeks-long iteration process. Be careful, some of these are not too safe.

    1. When spinning, try to get one of the holes of a fidget spinner over the spin post. I have been able to get it to keep spinning! It looks cool.
    2. DANGEROUS, BE CAREFUL: Take two more magnets and latch them onto the sides (see the picture and video). Slowly increase the speed, keeping your face far from the spinning top. The magnets will fly off. WEAR GOGGLES TO KEEP FROM LOSING AN EYE.
    3. Customize your top! Paint patterns or stripes on it to make it look cool especially in slow motion videos.

    Do you have an idea for your own trick? Post it below! I will add the best ones to this Instructable!

    Potential Upgrades:

    • Big, powerful motor
      • Get that top spinning as fast as you want, even SCARILY fast
    • Wooden spinning top
      • You will need to be good at woodworking and VERY patient for this. Getting the shape of the top right to spin stably and easily took a while with printing, I cannot imagine the iteration process with woodworking
    • Motor control circuit
      • A rheostat/variable potentiometer/volume knob thing (everyone uses a different term for it) is not the "proper" or efficient way to control the speed of a motor, but the beauty is in the simplicity. I designed a speed controller that used buttons connected to an ATTINY85 microcontroller for this project, but decided it would limit the audience of who could build this fun little project. If you want an Instructable to show how to make a speed controller with an ATTINY85, vote for me in the contests and let me know down in the comments!!!
    • Fly away top
      • Make some fins on the bottom of your top. If properly designed, it should lift off when you turn up the speed. Want some files? Let me know by voting and commenting! I have not designed one yet but I want to leave you with lots of options of where to take this.

    Thank You:

    Thank you for reading my Instructable! Vote for me in the Plastics and First Time Author contests if you like what I made!

    9/18/17

    Greg

    Comments

    TreyH17 (author)2017-10-09

    what are the dimensions of the magnets? Amazon doesn’t have them listed anymore.

    gregjd5000 (author)TreyH172017-10-10

    The magnets are 8mm in diameter and 3mm thick. I clicked the link and it seemed to work for me! Show it here if you make it!

    mxx (author)2017-09-29

    An extremely thorough instructable, and a fascinating subject. I feel however, that you're limiting your audience somewhat by mainly focusing on a 3D printed top (you do mention the possibility of making it out of wood near the end). The design of the top seems quite straightforward to me, and I'm sure there are many ways the DIY'er will be able to construct it in other ways than printing.

    gregjd5000 (author)mxx2017-09-30

    It would be interesting to make a followup on many different types of tops you could make, from plastic to wood to cement. Thanks for the comment!!

    bhavik zure (author)2017-09-29

    Nice idea, I will definitely try it.

    this is very well written instructable, I like to read it as you added your humor to it.

    just voted for both contest, but I think you can still participate in "Teacher's" contest.

    thanks for sharing.

    gregjd5000 (author)bhavik zure2017-09-30

    I guess you can enter a fourth contest after the end of one of the first three? I requested approval to be in the teaching contest!! Thank you.

    gregjd5000 (author)bhavik zure2017-09-30

    Thank you very much! Maybe I will switch from the GIF contest to the Teacher's contest. What do you think? I will go with your recommendation. Thanks for the comment and for reading through!

    Me robot (author)2017-09-27

    totally cool.

    one drawback.

    not forever spinning.

    only until the battery runs out!

    i will defenitely try this.

    especially the propellers

    gregjd5000 (author)Me robot 2017-09-30

    thank you.

    it outspins my attention span!

    you could modify it to run off of usb!

    post a picture if you do!

    have fun!

    NikyN2 (author)2017-09-24

    I was amused at the level of detail of the instructions. and now that I think of it - it makes sense since you did mention kids at the beginning, haha.

    that said, I love when instructions are abundant and clear - a lot of times writers have a ton of experience and seem to think all of us do - and it's not easy to follow, especially with electronics stuff.

    only thing I'm missing is a pic of the circuit's scheme - I find them extremely useful to figure things out.

    also, I'd love to see the guide on the speed controller - mainly 'cause I do need to build some of those for my PC fans. I was going to go the 555+mosfet route, but I left the project on hold mainly 'cause understanding all the DIY guides out there ain't easy. I even got a prototype working, but I had to buy lower-valued capacitors and... when they arrived (from china) I had moved on to some other stuff.

    the flying top also sounds a lot of fun - at least to read! (... to build too but I'm too busy lately, sigh).

    gregjd5000 (author)NikyN22017-09-24

    That is interesting to hear; it is tough making instructions for a group of people you have never met! I wonder if there is a way to learn the demographic of Instructables viewers.

    I had left out the schematic intentionally due to the simplicity of the circuit thinking anyone unfamiliar with the circuitry side would have a tough time understanding it, and anyone with the electrical background would see what is going on clearly enough. However, I do agree a schematic can clarify, especially with polarity.

    The 555 route is nice due to the basic components (and the proud 'did it myself' feeling from making an analog circuit), but lacks the modifiability of a programmed circuit. What functionality would you want to see? I also asked @mcmasterp below because I would love to create one that caters to community interest but also achieves other cool tasks.

    I am going to have to play around with the modeling for that. It should be simple enough to get it to reduce the friction on the surface, but getting it to launch would require a very strongly coupled pair of magnets!

    Thank you for your comment! I appreciate that you took the time to read through my work.

    NikyN2 (author)gregjd50002017-09-30

    I always imagined people who read this are just DIY enthusiasts - probably of all ages and with varying degrees of knowledge. but they all have in common that they like DIY stuff (else why bother coming here, don't you think?)

    as for the speed-controlled version, my only requirement would be to be able to go from 0 to max RPM (of the motor or in my case the fan), ideally controlled with a variable resistor (so I can swap that for an NTC resistor and have automatic temp control - ain't that COOL?). but I guess good old "up" and "down" buttons may be cool too. maybe a screen showing the RPM?

    and for the flying one, you don't need that much speed - just a good aerodynamic design. if the thing is light (i.e. not solid), a few blades (like those of a fan) of enough length AND adequate shape, and there you go. maybe add a way to decouple the magnets for easier takeoff.

    see, I had a toy that was just a spiral rod and then some "fans". I... would have to write a whole essay to describe it (I'm bad at this, okay?), but suffice to say, the fan-blades were at most 10cm diameter, and the speed couldn't be THAT big (a few tens of RPMs maybe). those things did fly.

    granted you'd need a higher speed for takeoff, but with enough lightness, a few hundred rpms would do. (then you have to consider the magnets... they must orient each other, but they must not really attract each other! - though the decoupling takes care of that).

    rebeltaz (author)2017-09-20

    That is pretty cool. As no fan of google/farcebook/twits/youtube censorship, I'm curious... what does [flagged 'repetitive' by their system] mean?

    gregjd5000 (author)rebeltaz2017-09-20

    Thank you! YouTube understandably does not want something annoying on their website to keep people from "x"ing out the window in frustration. Good content keeps people clicking from video to video. The video that failed their test is of a magnet spinning on a stationary box for ten seconds. Understandably, to their neural networks, that seems like something that could be annoyingly repetitive. Picture the Nyan Cat or something like that. I am going to try other embedable sites tonight to see if I can get videos on there. Thanks for the comment and for reading my work!

    Yonatan24 (author)gregjd50002017-09-21

    That is really weird. I think that's a mistake. Youtube is excellent at removing content, but unfortunately still isn't very good at letting us know exactly why.

    There is a 19 hour video by the slow mo guys on Youtube. If your video doesn't have very good watchtime, the algorithm just won't recommend it as much, not remove it!

    I would contact Youtube help on Twitter if you have an account... :)

    gregjd5000 (author)Yonatan242017-09-21

    I tried adding two more last night of the top and both were removed... Maybe YouTube just doesn't like me! Just kidding; I wouldn't be surprised if the algorithm is more harsh on people with very few views and not many videos. I think I have a twitter from a few years back... I'll have to dust off my account and reach out to them. Thank you for the advice!!

    Do you (or anyone who sees this) know how to embed videos or know of good instructions to do so? I am using chrome and have tried videos on Instagram, Google Drive, I even made an account on Metacafe and tried that. Insta only embeds the caption, Drive and Cafe both just add a blank area. Let me know!

    Yonatan24 (author)gregjd50002017-09-21

    Yes. Because many spammers have new channels and can upload a hundred videos in a minute... Around 30% of the videos that get uploaded to Youtube get removed within 24 hours!

    Still weird. Maybe it's an issue with music/sound copyright or the tags? I believe Twitter offers a link for embedding a tweet. Have you tried Vimeo?

    gregjd5000 (author)Yonatan242017-09-21

    That's an amazing stat. I thought about that, but I purposefully did not upload one with music in the background. I'll try Twitter or Vimeo tomorrow! Thank you for the tips.

    I love the intelligence of the Instructables commenters :)

    That is indeed weird. As you mentioned, Vimeo is a good alternative.

    Ian01 (author)gregjd50002017-09-22

    This is the first I've heard about repetitive videos being removed. What about all of the "[whatever] for 10 hours" videos?

    gregjd5000 (author)Ian012017-09-23

    Who knows, Ian01. And they haven't been put back up, so it looks like I can't post videos on YouTube until December. Maybe early next week I'll contact them.
    Thanks for your comment, Ian01!

    valveman (author)2017-09-24

    This is cool.

    I had a commercial version several years ago and it would spin virtually forever.

    Nice instructable

    gregjd5000 (author)valveman2017-09-24

    Thank you, valveman. Before reading bpark1000's comment, I had never seen a commercial version. That is unfortunate! I will have to come up with something new!

    Thank you for the comment and for your approval! It means a lot.

    valveman (author)gregjd50002017-09-25

    At Disney World in Florida I picked up the forever spin top at the gift store.
    I still have it somewhere in a box.
    It consisted of a small plastic silver top that had a magnet embedded in it.
    It had a black slightly concave platform and took a 9V battery.
    Inside the platform was a coil connected to a transistor.
    When the top was spun, the rotating magnet top created a rotating magnetic field that crossed windings of the coil connected to the base and emitter of the transistor.
    This would induce enough voltage to turn on the transistor.
    The collector of the transistor was connected to a second coil and when the transistor was energized, would turn on the second coil and the top would get a boost and keep spinning.

    JohnC430 (author)valveman2017-09-26

    sounds exactly like one of those "Bendini" oscillators that I sometimes see on YouTube.

    gregjd5000 (author)valveman2017-09-25

    Very cool! Bpark100 posted a link to the patent below. It is very interesting; you should check it out! I love how they designed their circuit.

    JohanH44 (author)2017-09-24

    Great idea, especially being analog. Nevertheless, my suggestion for development would be replacing the spinning motor with static coils. The coils (several) would be controlled by a microcontroller. The tip of the top would be a pen. Varying the current strength in the coils will control the position of the spinning top, which will draw something, say tarot symbols at a spiritistic seance.

    gregjd5000 (author)JohanH442017-09-25

    I did not predict that comment would take a turn toward spiritistic rituals! Very interesting idea; if you make it please show a picture!

    Thanks for checking out my idea!

    untamned4now (author)2017-09-25

    When did you make this?

    gregjd5000 (author)untamned4now2017-09-25

    I came up with the idea a little over a month ago and developed it until last week. Why do you ask?

    Thank you for checking it out!

    misterxp (author)2017-09-24

    Very interesting and well made instructable thanks! I have seen a spinng world floating above a box. I think it could be made using a similar system to yours? I will try and play around with the idea one day!

    gregjd5000 (author)misterxp2017-09-24

    After showing some friends at work I found out a colleague of mine has that globe you mentioned. I am curious to get one just to take apart! I am sure there is an explanation online somewhere about how it works. I am sure you could add the fast spinning aspect to it without much of a problem!

    I love to hear that you are interested and if you get around to it, shoot me a comment if you need help!

    misterxp (author)gregjd50002017-09-24

    The one I saw, belings to my boss. Can't take that apart :-(
    However, when itis off, the globe is acted to one side and drops. So I thought there must be opposite poll magnets to keep it up and a magnet to make it rotate. However, after reading your instructable it can't be so easy. I thought of a magnetic ring rotating but don' have access to one, except in a speaker, and can't get it off without breaking it. When I have time I will try. You gave me some inspiration though! Thanks!

    bpark1000 (author)2017-09-24

    What you have is a magnetic stirrer, used widely for stirring nasty chemicals in glass flasks. This principle is also used to couple drive to pump without needing moving seals.

    A variant of this is a commercial toy (patented in the 1970's) called "top secret". It is available on Amazon.

    www.amazon.com/Warm-Fuzzy-Toys-815895013987-Secret...

    Its top is the same as what you have except the magnet is much weaker. Inside the base, there is a vertical iron rod on center with 2 coils wound around it, a single transistor, and a 9-volt battery. On-off switch is not required! There are no moving parts in the base.

    This is patent description, which explains it well.

    http://www.freepatentsonline.com/3783550.html

    When the top is spinned, magnetic induction turns the transistor on in pulses, timed to keep the top spinning, like a DC brushless motor does. Unlike your system, the top must be off-center on the base to get energy. That's the purpose of the bump in the center of the base. Otherwise, the top of mechanically free to wander around on the base. The top can be started spinning in either direction. The battery can last up to 2 weeks!

    gregjd5000 (author)bpark10002017-09-24

    Reminds me of Purdue Chemistry classes a few years ago. I was unaware that some pumps use that technique, but it makes sense!

    Thank you for providing a link! That is interesting to see and the explanation makes a lot of sense. If you have a magnetic field shooting up through the center of the platform and our around the sides, you could not have it sitting in the middle. As much as I would have loved to make it a toy myself, I am glad that whoever did do that made it well. Very innovative design.

    Thank you for your comment with research! If you decide to make one let me know!

    mcmasterp (author)2017-09-24

    Definitely interested I the attiny85 and lift off files. My daughter is gonna love this thing! Thank you

    gregjd5000 (author)mcmasterp2017-09-24

    Wow, get back from a long day to see 10,000 more views and a bunch of comments. I am glad to hear that! Any particular function you would be interested in with the attiny85?

    If you wait a day or so before starting I plan to put an update of the files up given the amount of attention! Just to clean things up a bit more.

    Thank you for your interest and for checking out my idea!

    Swansong (author)2017-09-19

    That's really fun! This would make a neat desk toy :)

    gregjd5000 (author)Swansong2017-09-19

    Thank you! With the metal tip it is pretty quiet! Let me know if you make one.

    About This Instructable

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    Bio: I studied Electrical Engineering at Purdue University. I love to build speakers and have been working with circuitry since the tender age of 8. I ... More »
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