Micro Spud Gun

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Introduction: Micro Spud Gun

About: 17 Years old, doing a Masters in Professional Engineering (chemistry/mechanical) starting at UWA next year. I like designing and building things, as well as competitive archery

A micro Spud Gun made from everyday objects! Safer and smaller than others around.
Video!:

http://au.youtube.com/watch?v=o9ZPeW_s540

Step 1: Materials

Materials:

-2 Soda bottles. I used coca-cola but as long as the bottle necks are the same it's ok.
-2 Lids to fit the soda bottles with the blue seal intact.
-A short length of pressure PVC pipe. This holds a large amount of pressure and fits very tightly with a friction fit inside of a bottle neck.
-A preferably non-brittle pen.
-Piezo electric sparker. Can be found in some lighters, BBQ lighters etc. Just need the kind with the brass contact and a single thin wire.
-Flexible PVC/plumbers' tape.

Tools:

-Hot glue/hot melt gun and cartridges/glue sticks.
-A drill or a very sharp knife, but the drill is highly reccomended.
-Exacto/hobby knife. Any sharp knife will do.
-Sandpaper/emery paper or a smooth file.
-Various drillbits.
-Hacksaw, preferably with a fresh blade.

Expendable:

-Propellant: Deoderant/cologne, butane, propane, hair spray etc. Do not use fuels such as petrol, LPG, diesel or higher combustion gasses such as hydrogen.
-Ammunition: Spit wads, potato pieces, Q-Tips, whatever you use.

Optional:

-Acetone and a rag to apply it with. Be very careful with this. The fumes are terrible and try not to get it on your skin (though it removes a lot of glues).

Step 2: Preparation

-Use your hacksaw to cut off the necks of the two bottles. Cut just past the large circular flange that is above the threads. Use sandpaper/emery paper to remove burrs and smooth the end.

-Cut a 3cm length of the PVC pipe which fits snugly into the bottlenecks. Remove the burrs and sand the ends smooth. If you have acetone, apply a small amount to a rag and use it to clean the outside of the PVC.

-Drill a hole in one of the bottle lids large enough to tightly fit your pen barrel. In the other drill a hole that will tightly fit the brass terminal and a small hole to fit the wire.

-Remove the contents of your pen (spring, ink etc.) and discard. Use the hacksaw to cut to the desired length. Trim with an exacto knife or sandpaper.



Step 3: Assembly

Slide the piece of PVC pipe inbetween the two bottle necks. Use PVC/plumbers' tape to attach bottle necks to each other.

Push the barrel a short way into the larger hole, and the glue on both sides with hot melt glue.

Place the brass terminal of the piezo into the other cap, then bend the wire down into the smaller hole. Position them so when you click the button a spark jumps from the wire to the terminal. After that is working hot glue it in place.

Screw the bottle caps onto the neck and the gun is complete!

Step 4: Fueling and Firing.

Place your preferred projectile into the barrel, and then spray a small puff of fuel into the chamber. This varies from fuel to fuel and is extremely touchy. Screw the barrel on, then press the button to fire. If it does not fire it is likely you flooded the chamber. Unscrew the barrel, wave it around a little then screw the barrel back on. Repeat until it eventually fires.

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    39 Comments

    by the way what size PVC did you use??????????????

    I made one but i the spark from the sparker doesn't light the spray. Itried seversl different kinds but it still didn't work. 
    Anybody have answers??

    3 replies

    hey dude your probably using deodorant that isn't flammable enough. use Lynx or in america they call it Axe as it is very flammable. if you cant access this just use hair spray

    i had the same problem. but i found out how to fix it. you need the right amount of fuel. i used gas from a lighter. hold the button down and aim the gas in the container. first try holding it down for 1 second. if it dont work then try 2 seconds. keep doing this until you get a result. remember to shake the mini cannon once you have put gas in it and put on the cap. hope it helps. =]

    nice one but an increased barrel length would give it a lot more power and accuracy.

    I made my own design after looking at the main picture. I use lighter fluid and a rifled tube. It shoots a jet of flame when it fires. It fires Qtips, paper, and potato. Picture coming soon.

    1 reply

    how the heck did u rifle the barrel dude please share that one with me man

    This is the best gun me and my friend have ever made! Thanks for the idea! And to bluebox: Use a small amount of ignition, just a quick spray, and from about 2 and a half inches away. (i reccomend using axe deoderant).

    How far does it fire?

    I made one but it's different but do not use fuel use flammable gas like hare spray

    1 reply

    i cant find this size of pipe i had a pipe that i think is 3/4 inch or 1 inch thats one of the most common sizes im thinking of just gluing the bottlemouths together with hot glue could this pose a problem even if its a good tight fit?

    1 reply

    okay soi made it and heres a pic.......... havent tried it yet so heres hoping

    Photo 1.jpg

    some ammunition suggestions: tic-tacs airsoft pellets small nails (do not aim at living things!!) the lid of the pen put on the barrel loosened.

    1 reply

    tic-tacs are awesome, the tend to bounce instead of break like i thought.

    mine is very loud when you fire tiny chunks of potatoes it makes a BANG and sprays potato juice everywhere.

    makes a sort of THWIP noise when it fires, not very loud.