quarta-feira, 1 de maio de 2013

Uma Máquina de corte Laser CNC... Open Source! E a Net, como começou, mais Escrivaninhas cheias de truques, e o Motor Mendocino.

Hack N Mod está em destaque, hoje, porque vale a pena lá ir, e muito!
Para começar, vão lá encontrar os planos desta Máquina CNC de Corte por Laser, que vocês podem construír em casa!
É bom! 
E na página, têem um Link para mais os outros 9, destes 10 projectos CNC!


Superb Open Source CNC Laser Cutter

The Open Source movement sets another fine example with this superb 2-axis laser cutting/engraving station.  This is version 2.0 which has a more compact size measuring 12” x 20” x 4”. The DIY laser cutter/engraver has a manual vertical axis but you can opt-in for a digitally controlled one.







O alerta veio ontem, do nosso amigo João Marcelino, mas hoje dou-vos a notícia, para comemorar os 20 anos do primeiro Site da Internet, sim, meninos, a Internet não apareceu já como está, a CERN recriou o respeitável Dinossauro!
Só texto, com Links.
O que evoluímos, desde aí...



CERN recreating the world's first website

David Szondy

To old fogeys like me, it seems like only yesterday that the coolest way to go online was to dial up the AP wire service bulletin board on a 300-baud modem, but it was actually two decades ago that the web as we know it burst onto our world. On Tuesday, it was 20 years ago that the World Wide Web went public, when CERN made the technology behind it available on a royalty-free basis. To mark the occasion, the organization announced that it is recreating the world's very first website for posterity.

It wasn't much to look at – just text and hyperlinks – and the subject was the World Wide Web itself, so it wasn't exactly like finding a treasure trove of LOLcats or a Kirk vs Picard flame war, but the first website did mark a significant jump forward. Flash animation, Java plugins, apps, streaming video and even images and audio were still in the future, but that first site turned the internet from the domain of computer scientists and hobbyists into the information super system that modern society now depends upon.








Hack N Mod não só nos mostra as maravilhas de hoje, como as maravilhas mais engenhosas do Passado;
Eis um par de Escrivaninhas do Séc 18, que estão cheias de truques e compartimentos secretos, e se forem à página do Link, e como todas as páginas da Hack N Mod são cheias de truques, como as escrivaninhas, até há Links para fazerem as vossas próprias Secretárias modernas, mas com Segredos!


Incredible Transforming Desk from the 1700′s

This incredible transforming desk literally has hidden passages inside its hidden passages.  At first glance, it looks like a beautiful, ornate piece of furniture.  But in reality, many of its shiny brass embellishments are actually buttons which open secret drawers.  Keep in mind all of this is achieved mechanically – No electronics were used.

But wait, there’s more!  The crafsmanship doesn’t stop with just one desk.  Here’s yet another piece from the same artist:

http://hacknmod.com/hack/incredible-transforming-desk-from-the-1700s/
 








E querem fazer algo de divertido e didáctico com os fabulosos Ímanes de Neodímio?
A K & J Magnetics ensina-vos a fazerem este invulgar Motor Mendocino, que funciona a Energia Solar:




Pseudo-Levitation 

In this first of a two-part series, follow along as K&J Magnetics builds a Mendocino Motor using neodymium magnets.

What is a Mendocino Motor?

The Mendocino Motor is a magnetically levitated, solar powered electric motor.  It was first made by inventor Larry Spring of Mendocino, California, for which it is named.
The motor consists of a spinning shaft that is held up by repelling magnets, stabilized by resting a point against a wall.  It is powered by solar panels mounted on the spinning shaft, which generate currents through coils of insulated wire.

What is it for?  Why build it?

First, let’s acknowledge that this motor isn’t very powerful.  It isn’t useful for getting much work done.  You’re not going to power a car with it.
It is a fun science project and a cool conversation piece.  We like it because it is a great demonstration of the principles involved in most electric motors.  If you can understand how this one works, you’re on your way to understanding all sorts of electric motors.  Mendocino motors are usually constructed from simple, easily understood, readily available materials.
 
http://www.kjmagnetics.com/blog.asp?p=mendocino-motor-1








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