Building A Square Bicycle

Inspired by [Michael Ubbesen Jakobsen’s] BauBike design, [Aaron Seiter] decided to try building his own.

The entire frame was made out of 1″ square steel tubing and welded together in no time at all. Actually intending to ride this bike, he had to make a few changes to the original BauBike design. Most importantly, he raised the seat up to allow for proper leg extension while pedaling.

The funny thing is most people on Reddit thought it wasn’t going to work, so shortly after posting the gallery to imgur, [Aaron] also uploaded a short video to YouTube to prove, yes, he can actually ride it. Stick around after the break to see it in action.

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Smart Juggling Balls

For the 2015 Hack a Day Prize, [Arkadi] is working on an educational platform using the Arduino for Smart Juggling Balls.

His goal for this is to create an open-source platform which, beyond juggling, can be used to teach physics in both an interactive and fun way. The juggling balls feature a RGB LED, an Arduino pro mini, and some MPU’s. They can be programmed to change color based on acceleration, gravity, centripetal force, rotation, or even controlled remotely. As the project develops further, he also plans on creating lecture content to go alongside the project, which would make it an excellent and interactive project for a high school (or even college) tech or physics class.

It’s not completely done yet but he’s already posted all the source code and instructions for making your own set over on GitHub. Stick around after the break to see the prototype balls in action and don’t forget to get cracking on your own Hackaday Prize entry!

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New 3D Printing Techniques at AMUG 2015

Sometimes there’s a lot of perks to working for a cutting edge tech company while also being a writer here at Hackaday. This week I had the opportunity to attend AMUG 2015 — the Additive Manufacturing User Group conference in Jacksonville, Florida.

I saw companies big and small, checked out the newest techniques like metal printing and mold making, and met a ton of interesting people. Join me after the break for the rundown and a video summary of my experience.

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3D Printed Wind Turbine Uses Bamboo

Using wood and aluminum for wind turbines is one thing, but how about 3D printing the blades and using bamboo to hold them together?

[Jeff Heidbrier] of Hero Electronics decided to try something new. He designed his own wind turbine to use cheap and readily available bamboo, with 3D printed parts. It’s a vertical axis wind turbine, unlike the typical wind mills you see generating power. The blades were printed on a Thing-O-Matic (nice to see they still exist in the wild!), and the turbine blades are about a foot long.

To make sure everything was level, he used a laser level to ensure his bearing system worked well. All in all, it looks pretty sturdy, but who knows how it will hold up to mother nature. Unfortunately there’s no clip of it actually being used outside, but I guess that just means we’ll have to wait for part 2.

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Powerwheels Racing Series in Detroit

[Transistor-Man] and the gang finally got around to documenting their experience at the Detroit Makerfaire 2014 and the Powerwheels racing series. They weren’t planning on entering, but in a last-minute decision they decided to see if they could whip up an entry just over one week before the competition! They did — and it’s awesome. They call it the Chibi-Atomic-Jeep.

As the competition name implies, they had to base the vehicle off of a Powerwheels frame. Bunch of steel tubing, some TIG welding and a nice paint job, and they had the base frame of their vehicle. At the heart of it? An alternator from a van — surprisingly powerful and easy to control. They used cheap 8″ wheels from Harbor Freight Tools — they worked great, just didn’t last very long… By the time the races were over, they went through NINE of these tires. Good thing they’re cheap!

The most impressive part of the build is the gears. They made them using a water-jet cutter at the local hobby shop and a Bridgeport mill with an indexing head — not an easy task to complete!

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A Scary Powerful Jacob’s Ladder

What to do with an extremely high voltage transformer and power supply… what to do…  what to do… Short it out Jacob’s Ladder style of course! Fresh from [Gristronics], a team of hackers had the opportunity to play around with a 11,000V transformer… and some copper pipe.

It’s 2.5m tall (just over 8′) and produces an awe-inspiring electrical arc. The transformer takes in 240V and spits out 11,000V. To help stabilize it, they’re even using some microwave oven capacitors to act as a ballast. The transformer is affectionately named “Betsy”. They even have a giant contactor (think relay with steroids) to act as the main switch.

During the initial setup, they noticed it wasn’t working very well, so they setup a camera to record at 240fps to see what was going on — turns out the coils were shorting to each other. After fixing the insulation, they got it working consistently — and holy cow is that a big arc.

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Mini BB-8 Droid Made from a Sphero

Hot on the heels of discovery that the BB-8 Droid from the new Star Wars movie is real, [Christian Poulsen] has made the very own miniature version of it!

It’s a brilliantly simple hack actually. Remember the Sphero? It’s a remote controlled ball you can drive around with your phone — great fun, but surprisingly not many people have hacked it…

The ball has an internal structure that allows it to roll around with ease. Which also means it has a fixed up direction — at least inside of the ball. All [Christian] had to do was crack it open and throw a magnet on the top of the inner-assembly. He then machined the droid’s head out of foam with another magnet (or metal, we’re not too sure) and boom-bada-bing it stays in place as the ball rolls.

Stick around after the break to see some GIFs of it adorably rolling around — and into things.

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