Step 6: Firing Mechanism

there are two ways to fire your gun you can use the electrical solenoid built into the valve or use the technique displayed by crispyjones

I will provide instructions for the electrical side
- 9V battery clip x3
- 9V battery x3
- shrink tubing
- wire
- switches, one that stays on and one that is momentary
- solder according to the diagram
- position the switches on the gun so that it is most comfortable for you
- use epoxy or glue to secure the buttons
Ive built a cnnon but the air just goes through the cannon. Do i have to remove the small white tab on the valve diaphram
<p>Since I do not know your exact configuration, I can't offer much advice. Sorry.</p>
<p>can you list the parts for me please. going to make one this weekend for a mud ride! thanks in advance!</p>
<p>The parts are listed in step 2 of the insturctions.</p>
<p>I can't wait to build this</p>
<p>how much does this cost from start to finish for all the parts? thanks</p>
<p>I don't remember the exact cost, but it was around $90. However, money could be saved for different parts that serve the same purpose.</p>
Hey man. I'm building a pop bottle launcher for my nephew for Christmas and I'm using the same concept of the sprinkler valve. However, I cannot get my solenoid to open the valve enough to release the pressurized air all at once. It just slowly releases a little air over a long duration. It's more than likely a power problem, but I'm out of ideas on what to try. Suggestions?
<p>I know this is way too late, but for others with this problem, I have a suggestion. The valve has a knob that controls the airflow. Loosen the knob as much as possible to allow for maximum air output.</p>
Sorry I didn't get back to you in time for Christmas. The problem you're having might be due to the valve itself, perhaps try a different brand. For my gun, (if memory serves me correctly) if the firing tank's pressure was too low, then the air would just &quot;flow&quot; out rather than dumping the full contents. Of course fill to a pressure that you are confident with.
<p>I am having the same problem as, firstson11, and i tried every thing you suggested, but it still goes maybe 15-20 ft with 40 psi, and with 100 psi it goes maybe 35-40. Help, my school is paying for the parts and they want results.</p>
<p>Consider the variables I stated in the reply to firstson11. Also consider that the valve used in the application and how it may inhibit air flow. </p>
I'm having issues with mine it's barly lobbing the t shirt out and it's at 40psi in the tank and suggestions
<p>When rolling up the t-shirt, make sure that the fit within the barrel it isn't too tight. But also keep in mind that a t-shirt rolled up to tightly will allow air to escape around the shirt and will not launch the shirt. Also consider your connections from your tank to your barrel. Small diameter connections will limit the rate at which the air can vacate the tank.</p>
<p>did you use electrical?</p>
<p>What kind of epoxy did you use and how did you apply it? Just dab it around the threads, or what?</p>
<p>I don't remember exactly what type of epoxy it was. I do remember that it was clear and could be handled after about 2 hours. Check the packaging for application surfaces to make sure you are getting the right stuff. And yes I would apply some to the threading, and a bit on both sides of the hole to seal inside and outside. </p>
<p>Danger: See link: This is not spam, but a warning. PVC will fail suddenly after a while. This was band member that hurt badly by a T-Shirt launcher explosion.</p><p>See the pictures and never use PVC to hold air, Please.</p><p><a href="https://fundrazr.com/campaigns/1Zs3c" rel="nofollow">https://fundrazr.com/campaigns/1Zs3c</a><br>..</p>
<p>This is not spam, but a warning. PVC will fail suddenly after a while. This was band member that hurt badly by a T-Shirt launcher explosion.</p><p><a href="https://fundrazr.com/campaigns/1Zs3c" rel="nofollow">https://fundrazr.com/campaigns/1Zs3c</a><br>..</p>
<p>Thanks for the instructions on the electrical part. </p><p>My team in robotics needed me to build a release for our shooting mechanism, this worked easy!</p>
<p>Great to hear that things worked out!</p>
<p>It worked but I do have a question about it:</p><p>I'm not electrical savvy, so I'm wondering why there was a need for a momentary and non-momentary switch? </p><p>I just used the momentary in mine, what did the &quot;safety switch&quot; do? </p>
<p>The non-momentary switch interrupts the circuit acting like a safety. Therefore, unless the non-momentary switch is pressed, the gun cannot misfire. </p>
Wanted to say thanks for the instructable. I'm a physics teacher and we used this to launch eggs instead of the tired egg drop experiment. Kids loved it and it was a success.
Projectiles, the perfect way to captivate physics students
Absolutely fantastic. A couple of friends of mine own a minor league basketball team and mentioned a t-shirt cannon. So in the same spirit of this post, I offered to build one. I took the plans here and added a toy gun handle with a safety and trigger switch. Overall build time was about four hours not including cure time. So far it's been shot over 100 times (including a snowball fight) and is still going strong.
Glad to hear you like the design!
quick question did you do any math in order to build this gun. im having a bet with my friend
What do you mean by math?
I think he means calculations
How far does everyone else's shoot? Mine only shoots about 20 meters.
Very nice! i might modify this whole system and mount it on something for some kind of airsoft monster gun.
I am currently building a nerf gun using that sprinkler valve, I am assuming that I will need multiple batteries but what is the purpose of the two switches? Thanks,
the non-momentary switch acts as a safety, therefore if it is not in the on position, the gun cannot be fired
Ah, thanks. I will be adding a second switch to my gun for that!
What if my sprinkler valve runs on AC?
Have you tried applying a DC current to the valve? If you still don't hear the clicking sound of the solenoid, look online for a DC to AC circuit design, thats all I can really suggest. Or find a valve that runs on DC.
Thank You! It runs perfectly on DC. I will probably do this on my anti siphon valve. 5*
You might wanna make a hopper and tell everyone to looka t you then shoot them rapidly with t-shirts.
you should so add a rotating chamber to it so you can load 6 at once.. but there might be a problem when you need to keep all the air centralized
If I were to add a rotating barrel system I would keep the initial design but just unscrew the firing barrel and replace it with the multi-barrel attachment
that actually sounds a bit simpler than what i was going for. i just figured you could add a rotating chamber as a quick click on attachment but if your going for a permanent solution you should probably go with the rotating barrel system
idea on that. if you add it at the end to where the shirt just drops into the chamber wouldn't it work? although in the building process you would have to add a full circular backing to it so it doesn't just drop to the ground
I would actually prefer the rotating barrel idea because you can get a much tighter seal around the shirt than if it is able to slide down. But then again you could load the gun with bolt action and probably get just as tight of a seal from the shirt ruffling up
well what i was figuring is make the barrels just big enough to easily slide the shirt in and have a backing to it so it will not fall out. that way you would keep your original setup and original seal and yet have a way to load a couple at a time. although you would also have to make a mechanism that times the rotation of the chamber
Awesome t-shirt cannon. But your sprinkler valve should be running at 24vac not 27vdc you are most likley going to burnout your valve that way.
That was always one one of my concerns but the fact that I'm not constantly supplying voltage to solenoid should prolong its &quot;life expectancy&quot;.
you should so add a rotating chamber to it so you can load 6 at once.. but there might be a problem when you need to keep all the air centralized and the good...<br> <br>
what is the purpose of the valve on the back of the gun? great design by the way!

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