Aluminum Foil Pulse Coil

[Electrotek]

While surfing the patent data base, I've found a flat pulse power coil which I can use in my high power smoke ring launcher. My low power version is a speaker with a plate over the front, having a round aperture. Even though it's a ten inch speaker, it still launches a nice smoke ring, fairly rapidly, when powered with a pulse from a little 9V battery. With this flat coil, I can increase the power several thousand times. Back in the 1940's, German scientists and technicians experimented with this type of device, and were able to knock over a brick wall at a range of four miles. I've found out that the ring vortex makes an excellent 9V fire extinguisher - on a small scale.

Here's the coil, used for electroforming of thin metal sheets:

Apparatus and method for pulsed ... - Google Patents

I found another patent which tells an easy way to make this coil. They silkscreen the pattern onto an insulator, such as a polypropylene sheet, painting a type of glue which is cured with UV. Then they place a sheet of aluminum foil over the thin glue pattern, and apply pressure and heat, such as with a clothes iron. After it cools, any aluminum foil which is not glued down is peeled off, leaving the pattern. The edges are then brushed, to remove any jaggies. I think I can make a coil with regular glue, although the silk screening would produce a more uniform pattern.

Hot stamping glass - Google Patents

Then I found a flat motor for a bicycle, with a printed armature, something this process would be ideal for:

Flat rim type motor drive mechanism ... - Google Patents

Here's a patent which shows the rotor pattern:

Rotor for printed-wiring motor - Google Patents

Who knows? I may come up with an EV Gray type motorcycle.

With silk screening and the right kind of glue, thin line spirals can be made. So this process would also be good for easily making pancake coils, including the bifilar kind.

If anyone wants to buy a vortex fire extinguisher, I have one for $50.00. By offering to sell one, this goes into the Public Domain after one year, whether anyone buys one or not. If someone tries to patent this, it will take longer than a year, so the idea is safe - and free.

[Electrotek]

Printed Resist

I haven't had much luck getting a glue which will hold aluminum foil strong enough to allow the unglued part to be peeled off. I guess that's why they patented the Hot Stamping Glass method, since it's so hard otherwise.

However, I saw over at the instructables.com site that some people are printing resist patterns for their PCB's using a laser printer. They spray glue a sheet of aluminum foil to a piece of paper, then run it through the printer. When it comes out, they use an iron to transfer the pattern onto the PCB blank, then etch. So it might work to etch the foil itself, using lye.

If this works, I'll be able to use a sheet protector behind the foil, then print resist patterns for the spiral coil as well as a motor armature.

[Inquorate]

Circuit board

I'm guessing a Bifiliar wound pancake coil would be easy to draw on the circuit board stuff; rinse in whatever they use to dissolve what they haven't drawn on, and viola, pancake coil.

[dutchdivco]

Just a thought

Do you know anything about "metal leafing", like they use for hobbies, picture frames, etc.Except for TRUE GOLD leafing, which is expensive and a pain in the ass, they use an acrylic glue, and allow it to dry. When dry its tacky, and the metal leaf sticks to it.Any leaf where the glue isn't just rubs off.Don't know if the leaf would be too thin, or if this would work for what your doing, but thought I'd mention it. Jim

[Electrotek]

Thanks for the pointer, Jim. I'll check into that acrylic glue!