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Unread 05-10-2018, 06:00 PM
FredK FredK is offline
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T shirt Cannon barrel material and adaptor

Everything figured out except the barrel and adapter for the cannon. Been searching for something that doesn't require extensive metalworking or cost over $100. Any suggestions appreciated. Have found galvanized 3" pipe with a 3"/1" reducer but it is expensive. Cannot find a reducer for a 3" copper pipe. Not using PVC.
Thank you
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Unread 05-10-2018, 06:33 PM
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Re: T shirt Cannon barrel material and adaptor

I'm not quite sure what you're after. CAD or screenshots (even better, touched up with MS paint diagrams of what you need) would be really helpful.
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Unread 05-10-2018, 06:33 PM
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Re: T shirt Cannon barrel material and adaptor

Might be a weird suggestion, but box tube might work well actually. Itís easy to find at your local metal distributor, comes in really long lengths, and is generally under $100 depending on your size. Attach your box tube to maybe a wooden/ metal base so your launching mechanism can interface with the barrel.
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Unread 05-10-2018, 06:39 PM
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Re: T shirt Cannon barrel material and adaptor

Looking for something to make a 3" diameter t shirt cannon barrel and a way to attach it to a 1" pipe at the end of a pressurized air system (a solenoid, accumulator tank, pressure guage and storage tank.)
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Unread 05-10-2018, 06:46 PM
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Re: T shirt Cannon barrel material and adaptor

I'm guessing that 3" is the ID you're after, not the OD. If you can weld, that's an easy way to make braces for actually mounting/aiming the thing. Alternatively, you can use pipe clamps to the same effect.

When it comes to the barrel itself, if you have a lathe it'll be dead easy - the barrel can be a pipe where you've cut a thread onto the end, and the join can be another lathe part with threads on either side. If that's beyond reasonable for you, you can just use a press-fit or tight fit with a connector piece made out of some solid round stock on the drill press, then add loctite.
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Unread 05-11-2018, 07:00 AM
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Re: T shirt Cannon barrel material and adaptor

You might look at automotive exhaust pipe, Muffler shop, parts store, etc. Also most cities will have a scrap metal dealer that buys, and, sells odd lots of metal.
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Unread 05-14-2018, 05:59 PM
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Re: T shirt Cannon barrel material and adaptor

Quote:
Originally Posted by FredK View Post
Everything figured out except the barrel and adapter for the cannon. Been searching for something that doesn't require extensive metalworking or cost over $100. Any suggestions appreciated. Have found galvanized 3" pipe with a 3"/1" reducer but it is expensive. Cannot find a reducer for a 3" copper pipe. Not using PVC.
Thank you
Try some Acrylic, I've had good results with it and its very strong. they don't use it for fish tanks for nothin'.
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Unread 05-14-2018, 06:33 PM
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Re: T shirt Cannon barrel material and adaptor

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Originally Posted by 21brownz View Post
Try some Acrylic, I've had good results with it and its very strong. they don't use it for fish tanks for nothin'.
They also use glass for fish tanks. I wonder why people don't use it to make robots...

Poly-carbonate tubes aren't a bad option. They also have a nice look to them.
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Re: T shirt Cannon barrel material and adaptor

https://www.mcmaster.com/#pipe-thread-adapters/=1cue50y

Similar to: McMaster Part - 44705K446


We used these or very similar on ours. To connect to the aluminum tube barrel we used a sch 80 fitting from HomeDepot that had a smooth bore and fit the barrel well and female pipe threads. Then we put a bolt through to all the way through the barrel. Then the metal reducers threaded to it.
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Unread 05-21-2018, 10:34 PM
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Re: T shirt Cannon barrel material and adaptor

We're also starting on a project like this in our offseason. So far, the best material I've seen is DuraPlus ABS:

http://www.ipexna.com/usa/products/i...ndustrial-abs/

It's designed for air pressure up to 150 PSI or even 230 PSI depending on the type you get. I spoke to one of their engineers today about this application and he said the industrial version is just fine for this since it's low PSI and the air we use won't have oil or water in it. He also said that this ABS is so ductile that even if it fails, it peels in ribbons like copper does.

I originally found this product through looking at some OSHA notices condemning the usage of PVC for compressed air. Even OSHA recommends this stuff. It's what we'll be using, for sure.

https://www.osha.gov/dts/hib/hib_data/hib19880520.html

You'll probably need to call them to find a local distributor to get it. I'm guessing it will take a while to get into our hands, so I'll be ordering as soon as we know what we need.

Good luck!
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Unread 05-22-2018, 09:33 AM
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Re: T shirt Cannon barrel material and adaptor

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Originally Posted by 21brownz View Post
Try some Acrylic, I've had good results with it and its very strong. they don't use it for fish tanks for nothin'.
No, no, just no.

DO NOT USE PLASTICS FOR PNEUMATICS. The failure modes are catastrophic.

Fish tanks are by nature hydraulic and as such liquid which means it is incompressible.


Please people, think safety first and foremost.
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Unread 05-22-2018, 10:00 AM
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Re: T shirt Cannon barrel material and adaptor

Why donít you want to use pcv? Our t-shirt cannon barrel is made of pvc.
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Unread 05-22-2018, 10:53 AM
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Re: T shirt Cannon barrel material and adaptor

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Originally Posted by Kyle Warren View Post
Why donít you want to use pcv? Our t-shirt cannon barrel is made of pvc.
Take a look at this OSHA bulletin. PVC is hazardous and has a great potential for injury: https://www.osha.gov/dts/hib/hib_data/hib19880520.html
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Unread 05-22-2018, 10:55 AM
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Re: T shirt Cannon barrel material and adaptor

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Originally Posted by Daniel_LaFleur View Post
DO NOT USE PLASTICS FOR PNEUMATICS. The failure modes are catastrophic.
I agree with this in general, with the above IPEX Duraplus ABS as an exception because it's rated for air pressure, and even recommended by OSHA.
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Unread 05-22-2018, 11:11 AM
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Re: T shirt Cannon barrel material and adaptor

https://www.engineeringtoolbox.com/p...res-d_796.html this is a good source for pressures
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