does anyone know where to get the magnets??
Hand Crank Generator
Generating electricity with a 3D printed hand crank mechanism
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updated November 29, 2023
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So, i am ready to begin the project, but before I do I have a few questions. 1. what size bearings are needed for this. 2. what size spacers are needed. 3 what are the names of the parts that can't be 3D printed. And 4. What type of filament should be used.
@DeanBemma_2787834 I got these bearings off amazon uxcell 6000-ZZ Deep Groove Ball Bearings 10mm Bore 26mm OD 8mm Thick Chrome Steel ABEC3 Accuracy Z3 Noise Level 4pcs and XIKE 6804-2RS Ball Bearings 20x32x7mm, Bearing Steel｜Pre-Lubricated｜Double Rubber Seals｜6804RS Deep Groove Ball Bearing with Shields, Pack of 4. I 3d printed 4 of each spacer which is a quick print and I used plastic which is what it is made from
I made it! Thanks to Tom for creating such a great project.However, there are some drawbacks.First, it’s quite expensive. The N52 magnets are costly, and if you want to use thicker wire to generate more electricity, the costs increase even more. So, if you plan to use this product to charge your phone, it might not be the most cost-effective option.Second, some design improvements could be made. For example, the machine needs to be fixed in place while you crank it with your other hand, meaning both hands are required to operate it.Overall, though, this is a great project. It could be used as a teaching tool, has an appealing appearance, and operates smoothly—especially if you only need to use one hand.Thanks again, Tom!
Thanks for the great project – which voltage regulator did you use?
can someone male a bundle of what we need
can you please make a bundle of the stuff we need, because I can't find everything
@JJ_2546047 Everything is readily available on Amazon. I searched it exactly as it is listed.
can i plug this into a 12v lead acid battery and charge it?
@Celester_2578742
with something like a voltage regulator, probably yes. but it would take a long time. so it would not be very practical.
hello, I would rather ask how to correctly put the rotors against each other....it should be like in picture with number 2 right?
I´m little bit confused.
Thanks for replies (edited)
@TomasZajic_2370184
I did it like picture 2, and it works great!
also pay attention to the keying on the shaft! the two rotors should attract each other when placed in the generator.
In my build: The magnets did not 'klick' in the rotor like is suggested in the youtube movie. so I used some wood glue to keep the magnets in place. This is strong enough and you can take the magnets out if necessary. (edited)
@Pietert_2232179 Thanks for reply, I have already made it like you and it works perfectly.
Well, I finished making it, but I only get output of 14-16V max (8-9V under load) with 0.2-0.3 amps. Coils are 4 in series, 2 in parallel (I wanted higher voltage).
I understand my wiring is different and I should get half the current of Tim’s due to doubling my voltage, but the total power output is a mere 3W with me cranking for my life.
What could be going wrong?
Not sure if this is a problem, but after cranking, my voltage from the internal capacitors goes down at a rate of about 2 volts per second. (edited)
@einichi_862656
Things I could think off:
-Check if the two rotors placed correctly opposite of each other. The keying of the shaft only allows 6 positions and the rotor has 16 magnets. so this needs to line up correctly.
-Make sure the OUT-going wire of the first coil is connected to the IN-going wire of the sec coil. (and the 3rd and the 4th).
Where do I need to put the spacers?
What is the max speed that this could handle? In RPM
@calpete_2240772 probably speed of your hand
Total Cost: $65.79 (not including filament)
65 Hours of Printing
Produces up to 16V 2A at fast cranking speed
With 5V 3A regulator (enough to charge devices like phones) produces 5V 3A at decent cranking speed
Magnets are Grade N48 Neodymium
Enameled Wire is 1.0 lb 28 AWG (0.3429mm)
(Around 450 turns of wire per coil)
Needed 3 2200uf Capacitors to smooth out current
More Detailed Assembly Video https://www.youtube.com/watch?v=-mtxt8uvx9o At 15:00
Coils are connected in series and parallel. This gives higher voltage from the series and more current from the parallel.
Be sure all coils are wound in the same direction either clockwise or counter clockwise. And be sure to mark the start of the coils and the end of the coils this will be like negative and positive.
This project takes a lot of work. (edited)
@glassdoor_1553271 can you share the housing spacer file and how to connect the voltmeter and capacitor. Thanks! (edited)
@MackCapsize_2202200
I don't know what you mean when you said "housing spacer file".
The capacitor just goes on the Dc output on the bridge rectifier (make sure the negative is connected to the negative DC output and same for the positive)
The voltmeter's negative and positive wires are also just connected to the negative and positive outputs on the bridge rectifier.
