Shrinking an air-raid siren to fit into your pocket
Quoted as being ideally suited for those looking to be really annoying, this laser cut project by Mark Langford on Instructables might catch your attention. Taking the same principles that give air-raid sirens such an impressive audio impact, he has condensed them down into a neat little package that can fit on a key ring.
After several iterations, the mechanics of the three-layer design were perfected and (as you can hear in the following video) it really does work. Extra points of course go to the fancy eyebrow acrobatics!
Here is how it works:
The air you blow in blows out through the pattern of holes, and at the same time, it makes the turbine spin.
If there was no turbine, the air would just hiss out of the holes, but the holes and blades are designed so that the spinning turbine alternately covers and uncovers the holes, rapidly blocking and releasing the air in a series of pulses that make the noise you hear.
See the Turbine Whistle on Instructables where you can learn from Mark’s thorough project walkthrough. There are plenty of step-by-step photos and of course you can download the files to make a pocket siren of your own.
Brad Hill is the creator behind LittleRP – A DLP projector-based resin printer that can be put together for as little as $499.
Brad set out to create a printer that was open, flexible and affordable. Rather than using proprietary resins, the LittleRP is designed to use as many different formulations of UV curing resins as possible. By focusing on smaller, higher quality prints, the LittleRP is able to provide high accuracy while keeping costs low.
The flexibility and low cost helps explain the explosive popularity of the LittleRP’s Kickstarter, which passed it’s funding goal of $25,000 is under 24 hours. As of this writing the LittleRP has raised over $98,000, just under 400% of it’s original goal!
The LittleRP works using a process known as 3D stereolithography, a 3D printing process that uses light-sensitive resin and a high intensity light source to build a 3D object, layer by layer, rather than using spools of plastic filament as on a majority of 3D printers currently on the market. You can check out the LittleRP in action on it’s Kickstarter Video:
iPad app makes it even easier to design for laser cutting
When we first heard about the iPad app Sketch It Make It, we were pretty excited. Now that developers Blank Slate Systems have released their clever drawing app to the public, our fingers are really twitching!
Sketch It Make It is able to rapidly transform even the wobbliest scribbles into neat geometric forms, and have them ready to export for digital manufacturing almost instantly. Whether you are laser cutting, using CNC milling or 3D printing there has quite possibly never been a faster way to turn ideas into tangible objects.
Surplus store discovery inspires DIY mechanical marvel
Rope braiding machines are mesmerising to watch as they go through their mysterious machinations. Having spotted such a machine in a Surplus store, David from Mixed Media Engineering reverse-engineered the 1890’s product so that he could nut out exactly how the device works.
The result is a 16-bobbin laser cut wonder, with orbiting spools that guide the individual threads into an intricately woven mesh.
“I have been experimenting with some exotics such as carbon fiber yarns (rocket fusalage) embroidery thread for great braclets, surgical tube core with nylon shieth for pressure tubing, and para-cord nylon.”
There has been such a great response to the project that plans are in the works to turn it into a DIY kit on Kickstarter for others to enjoy. To catch a glimpse of those cogs in action, check out the brief clip of David introducing the rope braider at the source article.
Leaves, MC Escher’s Rippled Surface and some sci-fi just for fun
Using a laser cutter to add physical presence to 2D artworks can be really effective, as these recent explorations from Maxime Beauchemin show. Having kicked things off with a rather elegant laser etched ATAT walker, he then moved on to more everyday ephemeral visions.
Pictured above is an acrylic replication of MC Escher’s iconic Rippled Surface print, where Maxime faithfully recreates the layered illusion of water surface, reflected trees and rippled distortion.
Turning to laser cut wood for another project, the delicate structure of a decaying leaf skeleton is revealed. (more…)