Instructables
Picture of micro spud gun
A micro Spud Gun made from everyday objects! Safer and smaller than others around.
Video!:

http://au.youtube.com/watch?v=o9ZPeW_s540
 
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Step 1: Materials

Picture of 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

Picture of Preparation
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-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.



minimoto5 years ago
I made one but it's different but do not use fuel use flammable gas like hare spray

HARE spray, like for rabbits?

One. minimoto3 years ago
hare spray? like, HARE spray?
air pressure?
bloke20224 years ago
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.
how the heck did u rifle the barrel dude please share that one with me man
bluebox174 years ago
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??
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. =]
thanks!!
pie R []ed4 years ago
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).
tom-mot4 years ago
How far does it fire?
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?
okay soi made it and heres a pic.......... havent tried it yet so heres hoping
Photo 1.jpg
toogers5 years ago
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.
toogers toogers5 years ago
tic-tacs are awesome, the tend to bounce instead of break like i thought.
cooptroop5 years ago
how loud is it
NIJU! cooptroop5 years ago
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.
kwlweapons5 years ago
Built my chamber out sch 80 galvanized steel... I just gotta tap my schrader in place so I can use it as a 2 x- 4x hybrid..........
LILhazY5 years ago
for the propellant did u use that can of lynx?
nonickname (author)  LILhazY5 years ago
Yeh, though if you look at my newer mini spud gun propane/butane works better. A syringe can be used to get the ideal amount. If you can make an appropriate chamber then fuels such as oxy-hydrogen and acetylene give massive power, but I don't recommend it.
oh sweet thanx dude
where do you get the sparker?
I got mine from a lighter
Just look for a pack of Bic electric, they use the piezoelectric ignition.
a stick lighter has one
TK$8Ball5 years ago
i need a vid pls dis is cool
mvberg5 years ago
yo bro, what diameter PVC pipe did you use?
nonickname (author)  mvberg5 years ago
if i remember correctly, 15mm. This was from aus. though so other countries might be different. If you want, just get a coke bottle and find the pipe that fits inside it.
thank you
if you are in the US, then try 1/2 inch pipe. you might want to use some epoxy to hold it on though, because it' not a tight fit.
Im also in aus (newie, NSW) And i can't get the stuff no more... sucks cause bunnings stopped ordering it 2 years ago and it just ran out!
Hmm i got some small pvc pipe (Conduit i think) I may make a simplified version of this
daltondude5 years ago
i just finished mine , but is about 1 to 1.5 inches, im going to write "size matters" on it
if you like this kind of thing you should defninitly check out my Spitball cannon instructable. find it by clicking on my name to see what ive done
This is a cool little idea. Im scaling down from the big guns. made a bazooka like one and got into a littleee trouble heh heh. great for annoying ppl at work. a good little pocket fuel is the axe bullet or binaca spray!
taka215 years ago
Hmm.. This a decent instructable on mini spud guns.. Good Job!