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quarta-feira, 8 de janeiro de 2014

Injecção de Plástico, Exaustor de Fumos, abrir uma Lata com as mãos nuas, e um Guia para Breadboards

Eis algo que me pôe logo bem-disposto, como fazerem a vossa própria  Injecção de Plástico, em casa.
Lembrem-se, quando bem feito, este método deixa-vos fabricar um Objecto em minutos, e não horas:

Home Plastic Injection Molding with an Epoxy Mold.


I made an epoxy mold of an existing plastic item. Then I was able to make copies of that item using a home plastic injection molding machine.
This process should work for many different types of items or models. Note that the original item must have a parting line without undercuts. That means the model must be able to be separated into two halves from which the new molded part can be easily removed.

Posso-vos dizer que cortar Placa por Laser CNC é uma maravilha...

Mas não os Fumos!

Façam como fizerem, ficam a cheirar a Incêndio, sem um Exaustor forte, como este, e se dá para estes, dará para outros fumos, de Fundição de Alumínio, ou até mesmo colar com Super-cola.
Atenção, isto não é só uma Ventoínha centrífuga, tem um Filtro e tudo, que vocês fazem em casa, com Material que se compra por aí, categoria:

Build a laser cutter fume extractor

I built my first laser cutter in 1996 and learned right away that laser cutters "stink". Well, at least the fumes from cutting smell awful and are quite harmful to breath. After trying several fume extraction options, back in 2002 I found the ElectroCorp RSU filter. It was a bit expensive, I think I paid $1500, but it did a great job extracting even the worst fumes from cutting acrylic. Fast forward to 2013, I called up ElectroCorp to buy replacement filters for my unit and found out that the original company was sold and is now being run by another company. This new company claimed to supply the same replacement filters, but after almost three months of going back and forth with them, it turns out that their filters are no longer the same, cost way more and look to be much less robust. Going through this challenging and frustrating process with them got me thinking. After taking a close look at how my old unit worked, it was pretty clear that I could build a similar unit quite easily that would allow me to use off-the-shelf and readily available parts. I figured I would document the process so other people with laser cutters could try their hand at doing the same. Depending on the supplies you have laying around your workshop, you should be able to build one of these for somewhere between $400 and $450. Here's how...

Dica do site The Blaze, eis como abrirem uma Lata de Conserva, só com as mão nuas, e não é coisa de Super-Homem, usa-se é de Habilidade a sério, este Russo é um Génio, em coisas práticas...

Here’s How to Open a Can With Your Bare Hands

There are still tin cans out there that don’t have the handy pop-top tab for you to pull, and thus, require a can opener.
But what if you don’t have access to the specialized, can-opening kitchen tool? What then?
Enter a Russian outdoorsman to teach you how to open that can using only your bare hands. Now, unless you speak Russian, you’re not likely to understand what he’s saying, but we don’t think the language barrier is too much of a roadblock in his lesson.

Para os Engenhocas o Breadboard é uma espécie de Esboço dum Circuito Integrado, que podem fazer, em definitivo, quando o Circuito estiver Ok, e sem problemas.
Por isso, cá vai um Guia para como o fazer ora isto está mesmo a calhar, porque vos permite poupar tempo, tentando aprender por vocês o que já cá está, à mão.
Atenção, é um Meta-Instructable, o que quer dizer que aponta para outros Instructables:

Comprehensive Guide to Electronic Breadboards: A Meta Instructable

Breadboards sometimes know as prototyping boards or proto boards are a quick way of working up and experimenting with electronic circuits. Originally breadboard circuits were circuits built on real wooden breadboards. Some commercial products like Atwater Kent radios were built this way. More recently the term refers to plastic boards loaded with connection points that accept wires and components and include some pre-wired connections. Many instructable articles have been written about breadboards and prototyping with them.  This is a pretty comprehensive guide to them ( but not in the guide format, comment? )
Not included projects that just happen to use a breadboard. ( Also I generally do not watch videos, so I have excluded them here. ) If you are an author of a breadboard instructable that you think I should have included, please let me know.

A note on the images in each step, each comes from the first instructable mentioned the step.

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