Making Model Rocket Motor Igniters

November 16, 2010 by Mike Szczys 28 Comments

[Stephan Jones] has an easy method for making your own model rocket engine igniter. The solid state motors used in this hobby consume one igniter with each electrically triggered launch. Whether you’re making your own motors or not, this construction technique should prohibit you from every buying an igniter again. The process involves bending some nichrome wire around a paper clip, adding some structural support to the leads using masking tape, and insulating the business end with a quick dip in paint.

Now would be a good time to send us your launchpad hacks. All we’ve seen so far is a launchpad for water rockets.

[via Make]

Final Take On The Machine: Winners

November 13, 2010 by Jakob Griffith 8 Comments

It’s finally here, the last episode of Scion’s Take on the Machine with Mitch Altman. In this episode all the teams are given a recap over their success and failures, and the clear winner is placed on top. We’re not ones to spoil the surprise so you’ll just have to click the link and watch to find out.

But lets take a moment to remember each team, The Transistor and their live action zombie game. Crash Space and their musical building. Pumping Station: One and their ice cream maker. Artisans Asylum and their breakfast machine. And lastly, NYC Resistor and their drink mixing slot machine.

Who’s ready for next season? There isn’t a next season you say? Perhaps a new influx of sponsored hackerspace competitions will spring up, or the whole concept will die out as quickly as it came. Either way, it’s all about the ~~money~~ fun and educating experience, right? And that’s all that matters.

[Thanks Deven, sorry you guys didn’t win.]

DIY Vaporizer

November 11, 2010 by Mike Szczys 93 Comments

Here’s a DIY vaporizer build. It uses a 30 watt Radio Shack soldering iron as a heat source that is regulated with a common dimmer switch. This is done by removing the soldering tip and replacing it with threaded rod attached to a brass pipe fitting assembly. This is housed inside of a Mason jar with a copper pipe for air intake and another for output. Not surprisingly the creator tipped us off anonymously, saying that this a “smoking accessory”. A bit of searching and we came across this Wikipedia article about a Volcano Vaporizer which sheds light on what one is used for.

We don’t condone using illicit substances. But even more so, we’re skeptical about breathing through this thing because of the warning that [Anon] included about noxious vapors put off by the epoxy putty when it heats up. Still, it’s an interesting build so we though we’d share.

Carbon Fiber Part Fabrication Guide

November 10, 2010 by Mike Szczys 38 Comments

If you’re thinking of working with carbon fiber this guide should be a big help. The example is aimed at the automotive crowd but the principles transfer quite easily. Carbon fiber parts are constructed in a similar manner as fiberglass parts. A mold is covered in a release agent, the fibers are put in place and covered in epoxy. With fiberglass the fibers are often sprayed on but carbon fiber components use woven mats of the material to build up multiple layers. Vacuum bags are used to hold the layers together, removing air and impregnating the fibers with the epoxy. This guide even outlines the construction of a vacuum pump needed for that step.

The benefits of carbon fiber are many, including strength and weight reduction. This makes it a great material for adding parts to weight-sensitive hacks such as quadcopters. But the mesh also has an interesting look which is why it shows up in custom electronics cases. The one real drawback is that when this material fails it is a catastrophic failure, tending to crumble across the entire structure rather than limiting damage to a small area. That means that a rough landing might be the end of your new parts.

[Thanks MS3FGX]

Build A Confetti Cannon For Your Next Party

November 8, 2010 by Mike Szczys 11 Comments

[Scott] built a confetti canon to spice up the party. It’s pneumatic and re-purposes a fire extinguisher as the air tank. He had a refillable extinguisher that used water instead of chemical retardant. After emptying the water and ensuring all of the pressure had been release he swapped the hose and nozzle for a sprinkler solenoid valve. Securing the extinguisher’s actuator lever with a pipe clamp holds the internal valve open, leaving the solenoid to control the pressure release. This way the canon can be fired electronically, or manually.

This type of solenoid valve is a popular choice with pneumatic canons. We suppose you could even adapt this for use as a T-shirt cannon.

[Thanks BoBeR182]

AI Via Super Mario Evolution

November 5, 2010 by Mike Szczys 25 Comments

Can Super Mario teach you to think? That’s the idea behind using a simple version of the game to teach artificial intelligence. [Oddball] calls this The Mario Genome and wrote at program that can take on the level with just two controls, right and jump. He gave the script 1000 Marios to run through the level. It then eliminates the 500 least successful and procreates back to 1000 using the 500 most successful. In this way the program completed the level in 1935 generations and completed it in the quickest possible time in 7705 generations. He’s posted the script for download so that you can try it yourself. It’s an interesting exercise we’d love to see applied to more random games, like Ms. Pac-Man.

[via Reddit]

Making Point Contact Transistors

November 5, 2010 by Devlin Thyne 15 Comments

[youtube=http://www.youtube.com/watch?v=vmotkjMSKnI&w=470]

[Jeri Ellsworth] is back at it again. We seem to cover her work a lot here. Her latest video above covers how she created a point contact transistor from a 1N34 germanium cat whisker diode. After opening the glass casing on the diode, she uses sharpened phosphor bronze metal from common electrical connectors as the collector and emitter. A 330 microfarad capacitor charged to 20 volts and then discharged though a 680 ohm resistor to the base and collector leads forms the collector region. Her test jig is a simple oscillator circuit such that a properly formed transistor will start the circuit oscillating and make and audible sound. We look forward to more esoteric knowledge of electronic devices being brought to our attention.