Search found 361 matches

by MRR
Mon Mar 16, 2009 3:01 pm
Forum: Pneumatic Cannons
Topic: Fully auto gun
Replies: 23
Views: 1331

Fueling, feeding, pressurizing ... what ever.
A bike pump is simply to slow to give it the needed punch.
BTW fueling...this valve style could work on a hybrid as well ... I think.
by MRR
Mon Mar 16, 2009 12:47 pm
Forum: Pneumatic Cannons
Topic: Fully auto gun
Replies: 23
Views: 1331

It sounds like he is using a bike pump.
So let him get a proper fueling system and see again.
by MRR
Sat Mar 14, 2009 4:10 am
Forum: Pneumatic Cannons
Topic: BudGun
Replies: 18
Views: 3831

Do you have deposit bottles (PET) where you live? Where I live nearly all drinks are in these bottles, designed for multiple use out of pretty thick plastic. Once I pushed one to over 200psi without deforming itself (only for testing).
by MRR
Tue Mar 10, 2009 2:46 pm
Forum: Pneumatic Cannons
Topic: Interesting new valve design.
Replies: 17
Views: 5656

I think it's the way Hotwired said.
A balanced piston that is easy to move because there is no specific pressure on one side.

I was thinking to build a trigger like that.

Image
by MRR
Tue Mar 10, 2009 11:33 am
Forum: General How-To & Discussion
Topic: Self-closing piston valve (brass fittings)
Replies: 66
Views: 27140

The I.D. of the hose barb is 18mm but i can also get one with 25mm I.D.
by MRR
Tue Mar 10, 2009 10:17 am
Forum: General How-To & Discussion
Topic: Self-closing piston valve (brass fittings)
Replies: 66
Views: 27140

@far_cry I would lie if I tell you a specific number but I'm sure it can handle more than a shockpump or a firdge compressor could provide and that's enough. @LikimysCrotchus5 Yea I know that I'm not the only one who build valves like that. I saw atleast two different people on youtube with simmilar...
by MRR
Tue Mar 10, 2009 9:55 am
Forum: General How-To & Discussion
Topic: Semi-Auto Pneumatic Design
Replies: 20
Views: 2789

@roboman The idea of that blow forward bolt is that you have a cone with big exhaust holes at the ?edge? (green) and a negative cone (blue) with a pipe in the middle. When you trigger your gun the blue part gets a hit forward before the air stream enters the pipe. I thought the shape of a cone would...
by MRR
Mon Mar 09, 2009 1:15 pm
Forum: General How-To & Discussion
Topic: Self-closing piston valve (brass fittings)
Replies: 66
Views: 27140

I got the parts + a 1 meter copper barrel from a friend for 20€~25$ (he is a plumber and doesn't pay VAT).
by MRR
Mon Mar 09, 2009 12:19 pm
Forum: General How-To & Discussion
Topic: Self-closing piston valve (brass fittings)
Replies: 66
Views: 27140

Thanks fore the kind comments, I really appreciate that.

@mark
The concept of that valve is to power a semi auto. The quick connect is only to attach the blowgun. I fill the chamber from another place, it's simply faster than pushing the pressure through a small equalization hole.
by MRR
Mon Mar 09, 2009 10:22 am
Forum: General How-To & Discussion
Topic: Self-closing piston valve (brass fittings)
Replies: 66
Views: 27140

Self-closing piston valve (brass fittings)

This is the way I build a high pressure self-closing piston valve (barrel sealer). min. actuation pressure: 30 psi (varies due to the used spring and piston) The parts: 1/2" quick connect (only to connect a blowgun, not to pressurize) 3/4" female to 1/2" male 1" female to 3/4" male 1" nipple (find o...
by MRR
Sat Mar 07, 2009 7:20 am
Forum: General How-To & Discussion
Topic: I am Extatic!
Replies: 85
Views: 6023

The front grip should be able to move from the left to the right of the gun.
Some people out there are left handed (me included) and it would be a nice
gimmick if you could customize it.
by MRR
Fri Mar 06, 2009 5:23 pm
Forum: Off-Topic Hobbies
Topic: Music for Youtube videos
Replies: 22
Views: 1614

Visit http://www.jamendo.com
It's all music under "Creative Commons" license (for non commercial use).
by MRR
Thu Mar 05, 2009 2:23 pm
Forum: General How-To & Discussion
Topic: Semi-Auto Pneumatic Design
Replies: 20
Views: 2789

I was also thinking about a blow forward bold and came up with an idea that might work without losing much performance. http://img525.imageshack.us/img525/9388/blowforwardjpg.jpg For the shape I would use a little funnel and cast it in epoxy. BTW which rings are bigger? a: blue circle b: green circle
by MRR
Thu Mar 05, 2009 12:43 pm
Forum: Pneumatic Cannons
Topic: Reducing pilot volume and piston size
Replies: 17
Views: 917

I build on of these, bad flow but really good as a pilot valve.
You can operate them with a blow gun (piston needs a spring) due to the little pilot volume.
by MRR
Wed Mar 04, 2009 11:44 am
Forum: Pneumatic Cannons
Topic: Gas Operating Ammo Feeder (Semi Auto)
Replies: 24
Views: 2992

We will see... I'm really in the mood to build this. I rather build something by trail and error than not trying it.

And by the way...if I don't get it to work I have all the parts to build a nice pump action reloader.