Search found 6 matches

by pactin9
Sun Dec 26, 2010 11:29 pm
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

Could you point me to a diagram?
by pactin9
Sun Dec 26, 2010 11:25 am
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

Oh I've just realised some of your initial questions weren't answered. And am obviously partially blind, I hadn't seen the blind two previous posts.


I'd swap the chamber for a length of galvanised steel pipe or something and go for higher pressures.
Using a hammer valve to pilot would be a way of ...
by pactin9
Sun Dec 26, 2010 1:11 am
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

But then probably loose the multi-shot (and the power tends to balance out as the pressure drops with the valve staying open longer) but a hammer valve piloting a QEV or modified sprinkler could work.


I would be glad to convert it to a piston valve if it were possible to make more than ~5 shots ...
by pactin9
Sat Dec 25, 2010 2:54 pm
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

al-xg: Thanks for the heads up. I thought about making a choke as well by inserting a smaller OD'd pipe into the end of the barrel (after smoothing out the edge of course). But currently concerned with my power; I fear my need for total aesthetics has led to the potential weakness of my gun :(

And ...
by pactin9
Fri Dec 24, 2010 7:40 pm
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

Metalmeltr: Ah that makes much more sense now :D I do have a self cocking hammer mechanism in the works so the opening force and speed shouldn't be a problem. In terms of making my valve larger, I might try to bore it out a bit with my burr set but it's a bit risky as I can't gauge the walls ...
by pactin9
Fri Dec 24, 2010 8:32 am
Forum: Pneumatic Cannons
Topic: Shotgun prototype
Replies: 18
Views: 4536

Shotgun prototype

To begin, my project was about halfway done before I ran the specs through GGDT (which is giving me numbers that I am not satisfied with). I wanted to create a spud gun that could be maneuverable (aka I don't want to lug around a 3ft barrel) and could make at least 6 consecutive shots before ...