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Advanced Micro

Built a miniature cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Advanced Micro

Unread postAuthor: inonickname » Tue Jan 20, 2009 1:39 am

My new cannon: the advanced micro!

Chamber: Pressure rated PVC, 0.5".
Ignition: Spark strip, 3 gaps. Copper.
Barrel: Various, simply glue it into a 1/4" nipple which allows it to thread into the end.
Fan: Pager motor, with a custom made fan. Runs off 1.5v.
Other: 1/4" (female) thread for barrel swapping and a schrader for optional hybrid/purging.

Chamber:
The chamber is a length of .5" PVC, cut, sanded and cleaned using acetone. Endcap is class 18 15mm PVC. Barrel attachment is 1/4" female BSB brass thread.

Ignition: Ignition comes from a 3 gap spark strip. I was originally going to use a circuit board but it proved difficult to cut. So a very small pipe was cut in half horizontally to use. The spark gap is made from copper tape. It's basically what it's name implies, sticky tape, and the upper part is copper plated. This was stuck to the pipe, and then a scalpel was used to cut 3 small zigzag gaps (points are best for spark transmission). Machine screw bolts into either end to attach wires with. It was then hot glued into the chamber.

Fan: A high speed pager motor (was ripped from a bit-clone) is held by a tower support in the center of the chamber. A custom fan was cut from plastic, the fan blades carved in with a scalpel, being reinforced with a thin coat of epoxy and glued to the motor shaft. It runs from a 1.5v battery (higher than originally intended) and it sounds like a psychotic bee.

Pictures:
Image
Testing spark strip and pager fan. NOT FINAL SETUP.

Image
Inside the chamber, Schrader valve in place.

Barrel, final ignition box and fueling to come soon.

Fueling I'm thinking of maybe a 2 part system. The butane canister and fueling syringe are offboard, and a valve/syringe plugin are on the gun. Simply fill the syring to the desired amount, plug it in, empty it into the gun. Close the micro dripper valve and fire.

Ignition box will be a project box, perhaps changing the heavy duty piezo over to a camera flash dumped into a coil.

YT vid of initial testing is uploading.

EDIT: video is uploaded, processing!
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Unread postAuthor: starman » Tue Jan 20, 2009 1:59 am

Looks promising so far. I like your use of slit copper tape for your gaps. That makes gap placement really easy doesn't it, and your use of a pager motor for your fan is ingenious!

I'm looking forward to a more complete cannon and associated pictures/vids.
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Unread postAuthor: inonickname » Tue Jan 20, 2009 2:09 am

Seen as I have no good pics of the interior I may pull it apart then rebuild, and do a how to on creating an awesome mini.

EDIT: http://www.spudfiles.com/forums/viewtop ... tml#227000

[youtube]http://au.youtube.com/watch?v=AVwt3Zu4t5A[/youtube]
The video is a bit shameful, due to it only being early testing part of the ignition was connected with stick tape. So it fell off, and ended up shocking me about 5 times.

ugh movie isn't working properly..one second.

Oh god..I can't get it to work..

Linky: http://au.youtube.com/watch?v=AVwt3Zu4t5A
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Unread postAuthor: starman » Tue Jan 20, 2009 3:38 am

It didn't look like your sparks were very consistent. You need to keep your spark leads separated as much as possible. If they are touching or cris-crossing, that's bad. It sounds like you may have some arcing outside of the chamber since you were getting shocked....shouldn't be happening. If you are getting the shocked, the sparks won't be jumping the gaps.
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Unread postAuthor: Insomniac » Tue Jan 20, 2009 6:23 am

It is possible the sparks were actually there, but they were between frames and thus didn't get shown on the video (or the camera captured them, but youtube dropped the frames in compression. It happened to me in a vid with my mini noisemaker cannon)

Also, fixed your link:

[youtube]http://www.youtube.com/watch?v=AVwt3Zu4t5A[/youtube]
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Unread postAuthor: inonickname » Tue Jan 20, 2009 6:45 am

Well I was setting up a coil for the camera flash circuit. I was holding down a wire, making sure not to touch the terminal and the thing shocked me! It had jumped through a couple of joints to my hand, but I was having difficulty finding where the other terminal had jumped me from. Then I found it! The soldering iron had previously slipped and had melted a hole through the insulation! I don't think it was the full charge (like it had been used but the residual charge is there). But I reckon it fried something. I'll have another shot tomorrow.
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