Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 77 users online :: 4 registered, 0 hidden and 73 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

35 bar repeater ( new pics on page 4)

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Unread postAuthor: Brian the brain » Mon May 19, 2008 3:32 pm

You want pictures??

This thing is far from finished, but I'm making progress.
I cut up a blowgun so far it is now only a hammer valve.
This valve works even better than the ones I tried to make myself.


I used the paintballtank as the reservoir to get a decent number of shots.
I got about 7 good ones.
With the short barrel it was pretty powerful, but ofcourse one twice the length would give better results.
Pressure used is 30 bar.
First shot was the aluminium plate, wich was set up loosly on my bench.
It flew off.
Second was at the old "body"I made for it, wich doen't fit it's current shape.The body's only function was to try the hammer.Again not clamped down.This too took off-------------------------->pachooooh

third and fourth shot are not shown.Went trough 3/4 inch of laminated fournature board.Exit hole was 2" ( yes, that is rediculous)

Oh..and it might be worth to mention, the QEV fires full auto with a pop-off pilot.
I'll get back to that sometime in the future, but this repeater is too much fun right now.
Full auto uses A LOT of air, I can tell you that much! and it made my ears ring.. :D

On to the pictures.
  • 0

Attachments
damagerepqev.JPG
Aluminium plate pretty beat up.I should have clamped it down for penetration!!
testsetuprepqev.JPG
damage and the prototype repeater
repqevsideview.JPG
view from the side.Hard to believe the pilot is a blowgun
It works wonders!Very smooth!
I used an actual hammer to set it off.The earlier version consisted of a fitting, rubber washer and a bolt.
That was even shorter, but gave me a headache.
repqevsideview.JPG (34.56 KiB) Viewed 732 times
recoqnisethis.JPG
recognise this??

THis is what you get when you are "triggerhappy"with a hacksaw and a 1/4"tap.
recoqnisethis.JPG (35.17 KiB) Viewed 732 times
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: MaxuS the 2nd » Mon May 19, 2008 3:39 pm

Ooooh, very nice BTB, but what's with the random Tee in the chamber setup?
  • 0

Badman
User avatar
MaxuS the 2nd
Colonel
Colonel
 
Posts: 674
Joined: Sat Jan 19, 2008 3:59 pm
Reputation: 0

Unread postAuthor: Brian the brain » Mon May 19, 2008 3:46 pm

Didn't have the right fitting.. :D

It's just a prototype, I haven;t bought anything for it.You can tell it's a piece of cr*p can't you?

When I get a day off I'll build it properly, with a 1 1/2 fixed reservoir and proper fittings to connect it all.

I'm contemplating building the lever out of plywood.
I've tried aluminium, it takes too long to jigsaw..


What do you guys think so far?
repeating sawed off is in reach ( or marble cannon)
  • 0

User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: MaxuS the 2nd » Mon May 19, 2008 3:50 pm

Actually I think it's pretty damn cool. Thinking of a magazine feed?
  • 0

Badman
User avatar
MaxuS the 2nd
Colonel
Colonel
 
Posts: 674
Joined: Sat Jan 19, 2008 3:59 pm
Reputation: 0

Unread postAuthor: Brian the brain » Mon May 19, 2008 3:55 pm

Lever action.I want the magtube parallel ( sp?) to the barrel.

I want to make this thing look it's best ( in case we have another competition, :wink: )
Hardwood stock etc.

I guess a lot of people will be turning their QEV's into repeaters from now on.
Trick is a very small ( 1.5 mm) equalising hole in the side of the piston and a soft spring behind it.

regular blowgun and large reservoir will work.
  • 0

User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: MaxuS the 2nd » Mon May 19, 2008 3:58 pm

Do the high pressure, but small volume shots still give a good amount of power?

I have something up my sleeve if we have another competition.
  • 0

Badman
User avatar
MaxuS the 2nd
Colonel
Colonel
 
Posts: 674
Joined: Sat Jan 19, 2008 3:59 pm
Reputation: 0

Unread postAuthor: Brian the brain » Mon May 19, 2008 4:02 pm

Normally, when the projectile leaves the barrel, the rest of the gas is wasted.Now the QEV reseats very fast.
So fast in fact you can't see the piston move when you fire it.
Still a pretty big boom though...
And you can see by the damage it's no joke.
The barrel is about 40 cm long.
With the correct reservoir and pressure,
1 meter should bury 5 shots into solid wood, at least
  • 0

User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Sponsored

Sponsor
 


Unread postAuthor: Hotwired » Mon May 19, 2008 5:12 pm

Brian the brain wrote:I guess a lot of people will be turning their QEV's into repeaters from now on.


My cannon's been a 5-6 shot 28 bar QEV repeater for over a year now :P

Forcing the QEV to act in the same way as a sprinkler valve is a interesting variation though, allows a simpler way to have a continuous air feed.
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: Lentamentalisk » Sat May 31, 2008 6:55 pm

ok, sorry to kick this up, but I was wondering how one would adjust the power on it, how much air is released per shot. Would that just be done by adjusting the strength of the spring in your blow gun, or the strength of the spring in your QEV, or what?
Also, how does the dropping pressure effect how quick it resets?

Edit: did I understand you correctly it that, by adding a spring, you can fill the cannon from the chamber side? Is that only if you drill an equalization hole? If so, how strong of a spring is needed?
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: POLAND_SPUD » Sat May 31, 2008 7:17 pm

yeah I think there has to be an equalization hole... normally the piston on QEVs works as a one-way valve
  • 0

User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: Brian the brain » Sun Jun 01, 2008 4:12 pm

NEW PICS !!!


Yep.You need the eq-hole.
Can't call it kicking up when the topic is alive and well now can you?


Power is determined by the hammer.The force behind it and more importantly, the momentum it has.
The longer the exhaust valve stays open, the longer the qev does too.

The spring behind the piston is the SAME spring that returns the hammer valve and it is very light.Resetting is instantly, therefore the hammer is the most important factor.

I have finished the working parts in the grip, I gave it a quick paintjob to show it to you guys.I will resand some parts of it and give it an even smoother finish.
Handle is geniune hardwood, handcarved to fit my hand exactly.

The trigger is aluminium, the hammer is brass.Action is very smooth ( like a top notch airgun) and when fired at 20 bar this thing is incredibly loud...
I've decided a lever would destroy it;s looks, so I'm going for my favorite, breakbarrel design.

Not that much more work to do...just buy the reservoir bits and build the "basculating"part wich holds and rotates the barrel.

Remember this is a very powerful, multishot gun...and I still need to smoothen all the bodywork
Here are some teasers:

( and don't forget to comment!!)
  • 0

Attachments
bottomview.JPG
bottom view.
The small gauge can be seen.It works fine at these pressures.Red indicates it;s running low...
connecttobreakbarrel.JPG
I've already prepared it for breakbarrel breechloading.
connecttobreakbarrel.JPG (30.52 KiB) Viewed 575 times
viewonhandle.JPG
better view of the handle.Handcarved hardwood rocks!
viewonhandle.JPG (30.04 KiB) Viewed 575 times
fitsthehandthatmadeit.JPG
It is made to fit my hand perfectly.Right hand only!
fitsthehandthatmadeit.JPG (36.39 KiB) Viewed 575 times
rightsideview.JPG
dum-ta-dum dummm!!
rightsideview.JPG (37.91 KiB) Viewed 575 times
hammercocked.JPG
With the cocked hammer.I seem to have misplaced the picture of it when in rest.Anyway, it;s easy to cock with just my thumb, and the trigger is extremely smooth.
hammercocked.JPG (36.75 KiB) Viewed 575 times
Last edited by Brian the brain on Sun Jun 01, 2008 4:16 pm, edited 1 time in total.
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: FordGtMan » Sun Jun 01, 2008 4:14 pm

Wow, that handle looks sweet. Looks comfy too.. :D
  • 0

People call me ThunderChunks...I dont even know why...
Got a Gamertag?, mines KillerHedgeHog3, add me :)
User avatar
FordGtMan
Captain
Captain
 
Posts: 314
Joined: Thu Oct 25, 2007 9:15 pm
Location: southlake Tx
Reputation: 0

Unread postAuthor: Brian the brain » Sun Jun 01, 2008 4:20 pm

It's comfy alright!
It's even the correct angle.With my arm hanging down ( relaxed) the gun is pointing straight down.

This is a requirement for powertools..so it cant hurt if you incorporate that into a gun design...

My wife can't hold it, as it is a perfect fit for my hand...
  • 0

User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: MaxuS the 2nd » Sun Jun 01, 2008 4:27 pm

I'd take my hat off to you BTB, that is if I could find it. :lol:
  • 0

Badman
User avatar
MaxuS the 2nd
Colonel
Colonel
 
Posts: 674
Joined: Sat Jan 19, 2008 3:59 pm
Reputation: 0

Unread postAuthor: Lentamentalisk » Sun Jun 01, 2008 4:47 pm

That is F***ing awesome! Are you still planning on an "ammo elevator" reloading system? or what is this favorite break barrel method?

Also, how are you planning on integrating the air system? Is it going to go under the barrel, or will you have some sort of CO<sub>2</sub> tank attached?

Awesome idea: If you filled one specially shaped chamber with liquid CO<sub>2</sub> from a big tank, and then regulated it off of that into your firing chamber. That way you wouldn't have to deal with an odd, bad looking CO<sub>2</sub> tank hanging off.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Yahoo [Bot]

Reputation System ©'