Step 2: Step Two

Weld both the plates to the pipe you are using for the chamber, once that is done drill a hole for the spark plug make sure it is not too big then thread the hole with a hole threader or try your luck at getting the plug in without ruining the thread on it like I did, but make sure you have cut the bit of metal of the tip for a big spark first.

I made a spud/apple/pear/slop gun-you get the idea: ) I picked up all of the intended parts at ace. it is made of all galvanized metal piping, for safety reasons. not that thin PVC stuff. its powered by hairspray and/or butane.the striker is from an electronic lighter. in all it cost about $17. that's pretty good considering it can shoot up to 100 feet.
<p>Will it be ok to have a 1 inch chamber and 1/2 inch chamber?</p>
I am not sure what you mean??
<p>Cool. I am saving up for an oxy-mapp welder and this will be my first project. I will have a removable end plate since I will use a lantern sparker.</p>
<p>I stick welder will do fine if you have thick enough steel pipe, and make sure the area to be welded is free from grease and any other contaminant, also free from galvanizing, that makes life much easier. </p>
<p>You should have used copper pipe. You can just solder it and you are done. Much faster, easier and safer. Wrap it in foam to make a grip. Silicone works better if you can get it. COPPER ROCKS!</p>
<p>I don't like copper. It is thin, so you can't thread in an end plug or install the fuel/exhaust bolt. </p>
<p>I agree CCCP, although you can get quite thick copper pipe, it is hardly necessary to go out find copper pipe that is thick enough to contain the combustion without blowing you into next week. Also not to mention it is more expensive than mild steel. </p>
<p>I don't like copper. It is thin, so you can't thread in an end plug or install the fuel/exhaust bolt. </p>
Yea that sounds like a good idea standing a little bit back with oxy acetylene i wanna run with a oxy mapp gas set up since i cant get acetylene so it should still be good with mapp. Also what type of ignition are you using with the spark plug.im going to use a lantern sparker but the way i designed it i should easily be able to interchange the ignitions which you should be able to do too.
I was using an ignition coil driven by a capacitor and light dimmer, not very portable but good for shredding stuff though. I might use a relay and maybe an ignition coil for a portable one ( for distance firing hook it up to an Remote control car circuit). Please be careful with the oxy mapp mixture, I nearly lost my hearing and hand from a careless mistake with the oxy acet... in a milk bottle ( it was awesome though). Have fun!
Hey this is kinda late but im building a steel spud gun its going to have a 3&quot; chamber and a 1.5&quot; barrel how thick is the plate of the end of the chamber i have a flux cored welder so i cant do anything too thin i was thinking of 1/16-1/8 thick the pipe is about that thick. Also have you tried oxy-acetylene in your gun yet.
Hi, thicker is always better unless your in for weight saving, I think what I used was around 1/8 or something like that. But I made a smaller version about the same size as what your going to make... didn't work too well, getting the fuel air ratio correct was finicky. When I got it right it only shot a large marble 17 metres or 55 feet :( . I haven't tried oxy-acetylene yet, need to sort out a remote firing setup in case it blows apart. Any more questions just ask.
this is awesome, but i question it's safety. did you pressure test the welds and steel? how far does it shoot? <br> <br>also, a plastic potato cannon is one thing, this is something else entirely. this could get you put in jail just for having it, depending on what state or country you live in. <br> <br>other than that, this is AMAZING. would love to see a video of it blasting various things.
I am not concerned about the actual thing blowing up because the pipe is thick <br>(the pipe is the liner from an old bore) it should hold 100psi with ease. My projectile travels 150 metres or 492 feet. <br><br>Any ways I think a thick steel cylinder is safer than a thin piece of pvc pipe.<br>Hope I don't go to jail ! Will get some videos later hopefully :)
looking forward to them.
Here is the video: http://www.youtube.com/watch?v=cj4Yr0Wbxqg
Also you should post the instructable about the jet
I will do, the engine is pretty much made I still got to get the steel for the kart that it is going on, and the oil pump.
Are you british? Because no one in america says petrol
Na mate I am an Aussie lol.

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Bio: My name is Brendon and I live on a hobby farm in sunny Australia. My main interests are Gas Turbines (Jet Engines), High Voltage electricity ... More »
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