New and improved DIWire Bender

The DIWire bender we saw last summer made its way to Maker Faire this year with a new and improved version that is now able to bend steel even more accurately than the previous aluminum-bending version.

I chatted up [Marco Perry] (above, obviously), and he explained a new feature of the DIWire bender that makes soldering or welding creations made out of CNC bent wire even easier. The new machine features a sharpie that precisely marks where the wire should be welded.

The folks behind the DIWire – Pensa – have a ton of really cool wire sculptures at their booth at Maker Faire, quite incidentally within spitting distance of Hackaday’s Red Bull booth. Be sure to check them out if you’ve got a chance.

Fitting a CNC machine, 3D printer, and vinyl cutter in a suitcase

Maker Faire NY is awash with new and interesting computer controlled tools, but the most unusual so far appears to be Popfab, a combination router, 3D printer, and vinyl cutter able to collapse down into a suitcase.

Popfab is the brainchild of [Nadya Peek] and [Ilan Moyer] of the MIT CADLAB. With interchangeable heads for routing PCBs, 3D printing, and vinyl cutting. A conventional machine of this capabilities would have motors all over the place, but [Ilan] used a CoreXY system to make the stepper motors stationary relative to the frame of the machine.

The electronics are standard Printrboard and Pronterface fare, but it’s still a remarkable build that also fits into a suitcase.

Pictures of the machine, the XY system (good luck wrapping your head around that, but I can tell you it relies on the differential movement of the two motors) and the lovely [Nadya] holding up the plastic extrusion head. We’ll get a video up tomorrow. after the break

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Janus: The Gatekeeper


[Piet] wrote in to tell us about his hack that allows for his front gate to be opened without a key. Unlike this hack that we featured in August, you don’t need a subway pass, just a good memory. As explained in his article (and the video after the break) if the proper sequence of doorbell rings is input, the gate unlocks itself.

For hardware a [mehduino] is used to take the doorbell input and decide whether or not the “secret knock” has been achieved. The door can be unlocked remotely via a button on the processor. Reprogramming the code is achieved by simply holding the program button while the code is entered on the “remote ringer” button.

Be sure to check out the video after the break to see this lock in action. The housing application may not be exactly what you expect. Also of interest, is that in true hacker fashion, the bare processor is hanging by a hook on his wall! [Read more...]

Hackaday at the world MakerFaire in NY

For the next two days, [Caleb Kraft] and [Brian Benchoff] will be wandering around the World MakerFaire  in NY. Primarily stationed at the booth meant to show off our winning entry into the Redbull Creation contest, we hope to find some interesting things for you to read about.

We’ve already scoped out the MakerFaire and met a few people so we’re eager for the gates to open today and let in the flood of enthusiastic people. Speaking of floods, its been raining quite a bit so we’ve got our fingers crossed that we’ll get some clear patches so we can enjoy the things that require a little more space, like the “Centrifury” from North Street Labs.

While everything is going on here, it can be hard to sit down and write a worthwhile article, so those probably won’t appear until monday. In the meantime though, we will be uploading random amusing things as we find them to our youtube account.

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Water purification uses home-built electrolysis rig

If you plan ahead a little bit you could have your own system of water purification to use in emergencies. Everyone needs clean drinking water and this gadget will let your produce your own purification drops quite easily.

The solution contains chlorine, which is created through electrolysis. The PVC cap seen near the bottom of the image has two electrodes sticking out of it. These are titanium plated mesh plates separated by a rubber ring. The cap has a small hole in it to keep the flow rate low and the fitting at the top acts as a funnel. When you pour in a salt water mixture it passes through the energized plates and a chemical reaction splits the sodium from the chlorine.

A twelve volt power source is necessary for this to work. But since the electrolytic process takes just a minute or two you could easily source the power from batteries charged with solar cells. Check out a full build walk through and demonstration video after the break.

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Fancy beer pong table cleans your balls

Beer Pong seems to have been around for some time but it only recently exploded in to a universally known game. But one thing has always bothered us. Who wants to drink the beer into which that grimy little ball has fallen? Leave it to the frat boys at MIT to come up with a solution. Their beer pong table automatically cleans your balls.

Of course the table looks great. It’s outfitted with laser cut felt lettering on the apron, and the top features EL wire highlights. But the two features that really set it apart aren’t hard to spot either. First, there are rain gutters along either side to help catch the spillage. Secondly, that blue ring is actually the input nozzle for the ball cleaner. By pushing the ball through the vinyl sleeve it enters a recirculating liquid cleanser, popping out of the portal on the left a second later. That’s about all the details we have on the system, but you can get a closer look at the inner workings in the clip after the break.

The thing to remember is that these guys NEVER run out of ping-pong balls. They’ve got thousands on hand ever since they built this launcher.

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How to build a foam machine for your next party

Your neighbors are going to love you if you start filling up the back yard with foam at your next party. It’s an easy enough build, but depending on your ability to source the major components it could cost a pretty penny to use it at your next rager.

[Species287] used a big fan and water pump which he already had on hand. All together that saved him about $200 (he’s pricing in Australian Dollars but they’re almost even right now with USD). The soap solution is super cheap, just a bottle of dish washing liquid mixed to the correct proportions with water, but you’ll need a way to apply it to the fan. Some irrigation supplies connected to the fan grate with zip ties did the trick. The pump is submerged in the bubble liquid, causing it to spray from the nozzles near the fan. But this won’t actually create bubbles. The last piece is a bag-shaped hunk of shade cloth from the garden store. Each pore of the cloth acts as a bubble ring. The cloth gets sprayed with soap by the sprinklers and the air from the fan then blows the bubbles.

There’s no video of this project so if you want to see it in action this other diy foam cannon will have to do.