Detoured: Inside MachineHistories

When designers and architects need a fancy centerpiece, a design element, or even some wall sconces, they don’t head over to the machine shop by themselves. They get someone else, who owns some fancy machines, knows how to use those fancy machines, and can create anything out of wood, foam, or metal to do the fabrication for them. Think of these companies as artisan contractors, capable of turning whatever an architect thinks of into a real, tangible object.

One of these such companies is MachineHistories, a joint venture between [Steven Joyner] and [Jason Pilarsky], who work in the medium of computer code and CNC programming. As part of the SupplyFrame Design Lab’s Detoured series, lead Staff Designer [Majenta Strongheart] takes us along for a tour of MachineHistories to figure out how this collaboration actually works.

This collaboration began at the ArtCenter College of Design where [Steven] and [Jason] spent most of their time working in the shop. Eventually, they realized they didn’t actually need the ArtCenter and decided to sign a lease and strike out on their own. The first tools in their new shop were just a 3-axis CNC and a laser cutter, but MachineHistories gradually expanded to enormous five-axis machines and other incredible tools. These machines are put to work creating works of art for architectural and design installations, ranging from futuristic chairs, fine furniture, to sculptures and even new designs for simple home items.

The skill and craftsmanship that goes into these works of art are beyond compare, but this is a great insight into how all those manufactured panels, design elements, and artistic accents are created, and one that shows you can do anything, provided you have the right tools.

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A Bit More Than A Microphone: The Electret Story

When designing a microphone assembly the other day, I reached for an electret condenser microphone capsule without thinking. To be strictly accurate I ordered a pack of them, these small cylindrical microphones are of extremely high quality for their relatively tiny price.

It was only upon submitting the order that I had a thought for the first time in my life: Just what IS an electret condenser microphone?

A condenser microphone is easy enough to explain. It’s a capacitor formed from a very thin conductive sheet that functions as the diaphragm, mounted in front of another conductor, usually a piece of mesh. Sound waves cause the diaphragm to vibrate, and these vibrations change the capacitance between diaphragm and mesh.

If that capacitance is incorporated into an RC circuit with a very high impedance and a high voltage is applied, a near constant charge is placed upon it. Since the charge stays constant, changing the capacitance causes a tiny voltage fluctuation that can be retrieved as the audio signal from the microphone. Condenser microphones built in this way can be extremely high quality, but come at the expense of needing a high voltage power supply to supply the charge and an amplifier to buffer and magnify the audio.

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Precision DIY Calipers? That’s A Moiré!

Moiré patterns are a thing of art, physics, and now tool design! [Julldozer] from Mojoptix creatively uses a moiré pattern to achieve a 0.05 mm precision goal for his custom designed 3D printed calipers. His calipers are designed to validate a 3D print against the original 3D model. When choosing which calipers are best for a job, he points out two critical features to measure them up against, accuracy and precision which he explains the definition of in his informative video. The accuracy and precision values he sets as constraints for his own design are 0.5 mm and 0.05 mm respectively.

By experimenting with different parameters of a moiré pattern: the scale of one pattern in relation to the other, the distance of the black lines on both images, and the thickness of black and white lines. [Julldozer] discovers that the latter is the best way to amplify and translate a small linear movement to a standout visual for measurement. Using a Python script which he makes available, he generates images for the moiré pattern by increasing line thickness ratios 50:50 to 95:5, black to white creating triangular moiré fringes that point to 1/100th of a millimeter. The centimeter and millimeter measurements are indicated by a traditional ruler layout.

Looking for more tool hacks and builds? Check out how to prolong the battery life of a pair of digital calipers and how to build a tiny hot wire foam cutter.

 

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CIPODS: Earbuds For Cochlear Implants

If you wear cochlear implants, sound doesn’t enter through your ear, but rather from microphones above your ears. That means earbuds are useless and you have to resort to large and clumsy over the ear headphones. [Mjcraig23] wanted the convenience of earbuds and set out to do what we all do: hack it.

The result is handily portable as you can see in the video, below. The trick is that he used replacement battery covers and then grafted earbud holders (called EARBUDi) to them using one of our favorite fasteners, zip ties. Apparently, you can wire a cable directly into the device, but then you lose the ability to hear what’s going on around you, which would not be a good idea for catching some tunes while walking your dog or other common earbud use cases.

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