Cannon Design Help

[doomburger]

Hey guys! I am designing an aluminum marshmellow spud gun, and I want to make sure my design works before I buy all the things from McMaster.com...
So does this design work? Thanks!
(Don't judge my horrible handwriting/drawing skills )



1
Quick-Exhaust Air Valve 1/2" Inlet, 1/2" Cylinder/Outlet, 3/4" Exhaust

2
Low-Pressure Aluminum Threaded Pipe Fitting 1/2 Pipe Size, Coupling

3
Standard-Wall Aluminum Pipe 1/2 Pipe Size X 18" Length, Threaded

4
Low-Pressure Aluminum Threaded Pipe Fitting 1/2 Pipe Size, Tee

5
(2x) Standard-Wall Aluminum Threaded Pipe Nipple 1/2 Pipe Size X 1-1/2" Length

6
Low-Pressure Aluminum Threaded Pipe Fitting 1/2 Male X 1/8 Fem Pipe Size, Hex Reducing Bushing

7
(2x) Standard-Wall Aluminum Threaded Pipe Nipple 1/4 Pipe Size X 1-1/2" Length

8
Shock-Resistant Gauge Plastic Case, 1-1/2" Dial, 1/8 NPT Ctr Back, 160 PSI

9
Low-Pressure Aluminum Threaded Pipe Fitting 1 X 1/2 Pipe Size, Female Reducing Coupling

10
Low-Pressure Aluminum Threaded Pipe Fitting 1 Pipe Size, Cap

11
High Volume Lever-Handle Blowgun 150 Max PSI, 1/4" NPT Female Air Inlet

12
Standard-Wall Aluminum Threaded Pipe Nipple 1 Pipe Size X 8" Length

13
Brass Air Fill Valve Straight, 1/4 NPT, 1-3/8" Overall Length

14
Low-Pressure Aluminum Threaded Pipe Fitting 3/4 Male X 1/4 Fem Pipe Size, Hex Reducing Bushing

15
Low-Pressure Aluminum Threaded Pipe Fitting 1/4 Pipe Size, Tee

[Zeus]

Chuck an elbow on the blowgun, and you'll be right. I recommend an M/F save on the 1/4" hex nipple.

And replace the coupling on the end with a 1/2" to 1" bell coupling, gives you the option for a suppressor.

[doomburger]

Thanks, great ideas
I'll post a build and damage thread after I finish the gun.

[dewey-1]

Here is a 3/4" QEV with 1.5 x 12 chamber.
Total price on this will be less than your preliminary design.

Much more versatile launcher if using 3/4" QEV.

Edit: Added Tire Inflator pilot version.

[mattyzip77]

Badass sketches dewey as usual!!!!

[doomburger]

You should have posted earlier! Could have saved me a couple bucks
Ah well, at least I can say that this was my own design
Thanks for the reply!

[dewey-1]

You should have posted earlier! Could have saved me a couple bucks
Ah well, at least I can say that this was my own design
Thanks for the reply!

What do you expect in 3 hours time?

I am willing to say it probably took longer for you to make your sketch than it took me to do my version.

[mattyzip77]

Maybe I will make this dewey. Be ashame to see such a good drawing go to waste,,,

[jackssmirkingrevenge]

I am willing to say it probably took longer for you to make your sketch than it took me to do my version.

I believe that looks great as always.

I would mod it slightly though, to make it more efficient. Pressure gauge either removed completely (single shot and you should have a gauge on the pump anyway) or relocated to the main chamber, tee at the pilot end removed and schrader attached to the base of the blowgun. You would need to remove the schrader stem, and keep the blowgun trigger pressed while filling.