Blog Posts

terça-feira, 3 de setembro de 2013

Do Laser para a Fresa, Engenhocas pá criançada, Impressão 3D no Espaço, e TV de Cartão!

Se já fizeram algumas coisas com Desenhos Vectoriais que mandam cortar em placas, por Laser, fazer o mesmo Desenho, mas com uma Fresa CNC, não é tão simples...
Porque o corte da Ferramenta de Corte é muito mais grosso que o do Laser CNC!
Pois o nosso amigo Jon cantin dá-vos estes pareceres, e a sua experiência pessoal a fazer isso mesmo, por isso, têem aqui onde aprender como o fazer, para os vossos projectos:

Sydney Harbour Bridge: CNC Laser to Router Conversion 3 ~ Taking Shape 
Continuing on the file conversion here on… As I design all my models based on material thickness, these kind of thickness issues will reek havoc on the final design if I don’t catch all of them. Although I work in a 3D environment, it’s really 2D extruded to the material thickness. In this picture, you see a major problem. If I layer a piece over the bottom step that’s 4mm (squares help for sizing), I will have 2mm sticking out and intersecting the piece above it. Solution? Bring it down to 4mm and review the model closely to catch all of these.
The model will already be highly modified simply due to the span doubling but throw-in a 150% increase in size using the same material thickness and what may “appear” easy and straight forward has a lot of issues that could derail it in the real world. I went through TONNES of these issues with my earlier models so I know what to watch-out for but sometimes they can be hard to spot until you cut the model out and build it in the real world for the first time.

Isto é que motiva a criançada a meter mãos à obra! Os Vibrabots são umas Engenhocas simplissíssimas, e todavia, divertidas, logo que se montam!
Estas, até têem Controle Remoto:

RC circuit for a Bibberbeest / vibrobot

Last February I posted a vibrobot project "Scary bots and Super Creeps", making vibrobots out of connectors, cable binders and electrical wire. The creatures are named "bibberbeest" in Dutch.
Making Bibberbeests with kids is a HUGE success at schools, parties and festivals (second video in this step)! In the past months I witnessed 500 kids (6 yrs and up) making their very own, unique Bibberbeest.

Now what is more fun than a Bibberbeest? A remote controlled bibberbeest, using a standard audio/video RC? And it makes the project a bit more challenging to high school kids like monster-marit and emilyvanleemput :-)
So what I needed was a receiver circuit for a standard TV RC that can switch on and off a Bibberbeest, working on 3 Volts max.

At first I was tempted to go the microcontroller way, inspired by Masynmachien's Wiebelbot. But then I bumped into this IR toggle switch diagram, which I eventually used with some small modifications. The circuit worked fine on a breadboard, but turns out to be a bit unpredictable as a Bibberbeest brain... So the circuit in this I'ble is not a nicely polished and tested end result. It's a proof of concept and hopefully an inspiration if you're into vibrating creature making...

E tinha de acontecer, o Fabbing vai chegar ao Espaço!
Estes bacanos obtiveram um Prémio da Nasa, e lá vão eles, continuar a desenvolver uma ideia que vai facilitar enormemente a Exploração Espacial, porque o que se Fabricar lá encima...
Não presisa duma fortuna par ser montado cá embaixo, e mandado por Foguetão!

SpaceFab: 3D printing and robotic assembly in space

Colin Dunjohn

SpiderFab, a series of technologies under development by Tethers Unlimited, Inc. (TUI), combines 3D printing and robotic assembly to build and create spaceship components and structures in orbit. The groundbreaking systems are being designed to enable on-orbit construction of antennas, booms, solar arrays, trusses and other multifunctional components, ten to hundreds of times larger than currently possible with existing technology.
TUI has recently received an additional US$500,000 phase 2 NASA Innovative Advanced Concepts (NIAC) contract, supplementing an initial $100,000 phase 1 contract awarded in August 2012 to develop the new technology.

E chegámos à Televisão de Cartão! Mais própriamente, Televisores de Cartão uma versão em Cartão dos Televisores, Aparelhos de Televisão mais primitivos, os Mecânicos(!), e vejam como é fácil de fazer, utilizando uma Placa Arduino:

A cardboard televisor (with arduino and LEDs)


Recently I saw a documentary about the history of the television.  And to my surprise they showed that there existed a mechanical television before the well known CRT televisions.

Those mechanical televisions or televisors were pretty smart and simple.
A CRT is simply an electron beam that scans a surface covered with a luminescent phosphor line by line. And the intensity of the beam is then directly proportional with the whiteness of that particular spot on the screen.

A televisor works in a very similar way. But instead of an electron beam, holes are used. Holes in a spirally pattern on a disk scan a small area as the disk rotates.  After that particular area an electrical lamp varies its intensity. Bright means a bright spot wherever a hole is located.

There are some videos on youtube from people who have built other televisors. With more lines and far better image quality than this one. (but they aren't made out of cardboard)

This instructable documents the build of such a very small 24 line televisor completely from scrap cardboard, scavenged electronic parts a laptop and an arduino.
The image quality is very, very low but it is built out of cardboard and it has only 24 lines.
But it was a fun build.
If you want a good display, there are much better alternatives, (pretty much everything is a better alternative).

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