Instructables has a huge variety of Steampunk* and Cyberpunk* Guns that are true testiments to the creative genious of their makers but I'm often disapointed that they are no more than costume pieces (even if they are truly awesome to look at). I find myself thinking "wow that's incredible . . .it'd be really cool if it worked too!" and so I set out to create a rifle that will actually fire a bullet accurately but at the same time looks really steam/cyberpunk!
***NOTE:: I do not claim to even be knowledgeable much less an expert on the steampunk and cyberpunk styles . . . I'm merely an intrigued outsider. I've always been interested in this type of stuff but in reality there are people much more in tune to this universe than me. If you're one of those people please feel free to critique my design and terminology but please remember to be constructive and follow the "be nice" policy!
***Safety Note/Disclaimer*** I've been around power tools since I could walk and so there's a lot of safety issues that are innate to me that I probably will fail to mention. These powerful devices are extremely dangerous so extreme caution is required if you plan to follow these instructions. Never operate any of these tools without someone else present or at least within earshot. Hearing and Eye protection are a must and for heaven's sake keep your fingers away from anything sharp and/or moving!
Also, the finished product will be dangerous as it IS functional and it is up to YOU to make sure you're being safe with it.
***NOTE:: I do not claim to even be knowledgeable much less an expert on the steampunk and cyberpunk styles . . . I'm merely an intrigued outsider. I've always been interested in this type of stuff but in reality there are people much more in tune to this universe than me. If you're one of those people please feel free to critique my design and terminology but please remember to be constructive and follow the "be nice" policy!
***Safety Note/Disclaimer*** I've been around power tools since I could walk and so there's a lot of safety issues that are innate to me that I probably will fail to mention. These powerful devices are extremely dangerous so extreme caution is required if you plan to follow these instructions. Never operate any of these tools without someone else present or at least within earshot. Hearing and Eye protection are a must and for heaven's sake keep your fingers away from anything sharp and/or moving!
Also, the finished product will be dangerous as it IS functional and it is up to YOU to make sure you're being safe with it.
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Signing UpStep 1: The Bowels of the Beast
And lo the beast turned its hideous face unto me
and unleashed its swift and horrible fury
Okay so the guts of this thing are really straightforward: it's basically a spud gun and there's a lot of instructables and other online resources that tell you how to make this so for mine I will be very brief and quite vague . . . this part of the instructable is not sufficient for a first timer to create a spud gun but should be enough for someone who's got a little experience.
Parts:
While that's drying go ahead and unscrew the solenoid from your sprinkler valve, unscrew the top and open the valve up. Inside you'll see a rubber diaphragm. Off to one side of it you should see a little plastic spike with a hole in it. carefully remove the valve and take this spike out from the other side. If you're inquisitive like me go ahead and play around with the valve to make sure you fully understand how it works.
Now there's 2 types of valves out there: one type has a guide rod in the middle of the diaphragm and one does not. If yours does then you'll need to drill off to one side. Mine did not so now I drilled a hole through the middle of the top and tapped it for one of the barbs. Wrap a barb's threads in teflon tape and screw it into the hole with the wrench. Don't screw it in so far that it interferes with the diaphragm or you'll get a weird honking noise every time you fire it. I sorta liked this accidental honking so I left it in (see video). Now your sprinkler is modded. You can also buy a pre-modded one from a couple of online stores but where's the fun and learning in that!?
Take your modded valve and screw it onto the other end of the nipple (with teflon tape) making sure the arrows on the valve point FROM the tank TO the other side(barrel) screw your elbows together and into the other end of the valve and then insert your barrel. I had an iron sight from an airsoft sniper rifle but since the rifle has a scope I never put the sight on. I applied this now for aiming and coolnes' sake. Remember steampunk modding is all about found objects! But making a sight from scratch is possible too with a bit of effort.
The other barb goes into the back end of the blow gun(more teflon).
The NEXT DAY (pleas DO wait for your cement to dry completely) I put the hose onto my valve and blowgun to test the thing out and you can see the completed but unpainted assembly in the pictures.
If this is your first spud gun these instructions are certainly inadequate but fear not! Spudfiles has a good tutorial on the valve mod with discussion and troubleshooting and this site has plenty of other tuts on the subject.
HOW IT WORKS:
If you're curious, the valve has 2 chambers in it . . .one above the diaphragm and one below. The diaphragm has a hole that lets both chambers share equal pressure and so the center of the diaphragm (held by a spring) presses on the outlet keeping it sealed. when the blowgun is released the pressure from the top half exits faster than the small hole in the diaphragm will allow the tank pressure through and so we end up with a massive pressure difference very quickly. this pulls the diaphragm up and the pressure exits through the previously blocked hole and out the barrel. this all happens faster than greased lightening and so much more energy is conserved than if you use a simple, slow ball valve. This conservation leads directly to superior performance.
and unleashed its swift and horrible fury
Okay so the guts of this thing are really straightforward: it's basically a spud gun and there's a lot of instructables and other online resources that tell you how to make this so for mine I will be very brief and quite vague . . . this part of the instructable is not sufficient for a first timer to create a spud gun but should be enough for someone who's got a little experience.
Parts:
- 2" PVC end cap
- two 2" PVC couplings
- a section of 2" PVC for attaching the above
- 2" to 3/4" PVC reducer
- 3/4 PVC nipple
- 3/4" Solenoid Automatic Sprinkler Valve
- 3/4" PVC Male to female threaded 90 degree elbow (both ends threaded)
- 3/4" PVC Male to female threaded 90 degree elbow (only male end threaded)
- 2 foot 3/4" PVC Pipe(longer is possible but I liked the look of the 2 footer)
- PVC primer and Cement (yes of course it has to be PVC cement not ABS)
- a roll of teflon tape
- brass 1/4" shraeder valve (home depot failed here but ace had this)
- Two brass 1/4" hose barbs (one end barbed the other threaded)
- A Blowgun (the compressor type not the Amazonian)
- small hose clamps
- 2' section of pressure rated 1/4" Inside Diameter Hose (Homedepot failed again but ace had this)
- a vise is useful for holding things still
- a hand saw
- Cresent wrenches the right size to turn the barbs and shraeder valve
- a tap set (optional but really useful)
- a drill and assorted bits
- screwdriver (though a screwgun is quicker)
While that's drying go ahead and unscrew the solenoid from your sprinkler valve, unscrew the top and open the valve up. Inside you'll see a rubber diaphragm. Off to one side of it you should see a little plastic spike with a hole in it. carefully remove the valve and take this spike out from the other side. If you're inquisitive like me go ahead and play around with the valve to make sure you fully understand how it works.
Now there's 2 types of valves out there: one type has a guide rod in the middle of the diaphragm and one does not. If yours does then you'll need to drill off to one side. Mine did not so now I drilled a hole through the middle of the top and tapped it for one of the barbs. Wrap a barb's threads in teflon tape and screw it into the hole with the wrench. Don't screw it in so far that it interferes with the diaphragm or you'll get a weird honking noise every time you fire it. I sorta liked this accidental honking so I left it in (see video). Now your sprinkler is modded. You can also buy a pre-modded one from a couple of online stores but where's the fun and learning in that!?
Take your modded valve and screw it onto the other end of the nipple (with teflon tape) making sure the arrows on the valve point FROM the tank TO the other side(barrel) screw your elbows together and into the other end of the valve and then insert your barrel. I had an iron sight from an airsoft sniper rifle but since the rifle has a scope I never put the sight on. I applied this now for aiming and coolnes' sake. Remember steampunk modding is all about found objects! But making a sight from scratch is possible too with a bit of effort.
The other barb goes into the back end of the blow gun(more teflon).
The NEXT DAY (pleas DO wait for your cement to dry completely) I put the hose onto my valve and blowgun to test the thing out and you can see the completed but unpainted assembly in the pictures.
If this is your first spud gun these instructions are certainly inadequate but fear not! Spudfiles has a good tutorial on the valve mod with discussion and troubleshooting and this site has plenty of other tuts on the subject.
HOW IT WORKS:
If you're curious, the valve has 2 chambers in it . . .one above the diaphragm and one below. The diaphragm has a hole that lets both chambers share equal pressure and so the center of the diaphragm (held by a spring) presses on the outlet keeping it sealed. when the blowgun is released the pressure from the top half exits faster than the small hole in the diaphragm will allow the tank pressure through and so we end up with a massive pressure difference very quickly. this pulls the diaphragm up and the pressure exits through the previously blocked hole and out the barrel. this all happens faster than greased lightening and so much more energy is conserved than if you use a simple, slow ball valve. This conservation leads directly to superior performance.
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Before there was assault rifles, there were assault air guns:
http://www.beemans.net/images/Austrian%20airguns.htm
http://www.beemans.net/lewis-assault-rifle.htm
it sounds like if the epoxy you're using is breaking off the rubber then it isn't getting a good bond with it. You'll need to locate something that actually bonds with rubber as opposed to just sticking to it. I doubt jbweld would work unfortunately since it's not meant to give a flexible bond... I wonder if something rubber based would work better. You might try using a bit of inner tube and some rubber cement on both sides of the hole? Just make super sure to follow the instructions properly or you won't get the best of bonds (more of a general for everyone's info as opposed to being directed at you). They also have tire patch kits at auto stores that may even work out better for you...tires are made to be under pressure so it stands to reason the glue in those is rubber-bondable...
Failing that you could attempt to create a new diaphragm or source another hole-less one. How big is the hole?
and what do you use to fill the tank? and about how long does it take?
I'm working on a modified version of this right now!
I'd like to attach a pressure guage on the tank somewhere, but i dont know where would be best, any suggestions?
also i think i might build/modify some sort of battery powered air compressor that can be carried around on a belt or on the backpack to speed up the whole rea filling the tank thing
As far as a pressure gauge goes: generally you'd want to put it somewhere that lets you go through 2 layers of pipe (for structural reasons). I'd personally place it near the top if it was fixed or perhaps attach a barb, some hose, and then the gauge can go literally anywhere (it could go inside a hollowed out portion of the stock for example) and if you used steel braided hose it could look pretty stinkin' legit (imho of course). Just go with what appeals to you most :D
and i had to order the shrader valve online too ($2 on amazon. aka Brady air intake valve) because lowe's and home depot don't stock anything like it and the closest ace hardware is 90 miles from my house and out of stock
Oh, by the way...
Ever thought about pumping it up with an air compressor? that pump has got to be incredibly hard to get up to 70 psi.
If you like steampunk bands, check out Abney Park!
and howdo you refil the air canister?
There is a pellet rifle made called the "TALON" which uses a mini scuba pressure tank of 2000 PSI.
They also sell a hand pump similar in design to yours that will pump up the tanks to 2000 PSI.
The TALON is a single shot 1200 ft/sec .177 or .22. Really sharp looking rifles.