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 50 users online :: 4 registered, 0 hidden and 46 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

Crowley's First Co-ax - Update

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Crowley's First Co-ax - Update

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 8:17 pm

New Pics :)
The power from such a crappy design impressed me, I have plans for a 3/4" chamber, 24" 6mm barrel and possibly mounted to a rifle stock.


I made this as sort of a proto-type. Just so I could get some experience with co-axials.

Specs:

1" Chamber 12" long
6mm Barrel 16" long
Wooden Dowel Piston with O-ring.

Until I make a high pressure pump, I have a QC on it for my compressor. I'll switch to schrader when I make the pump.

I know it's way over kill, but it's just parts I had laying around. And it needs a longer barrel, but I need to find a hobby store that stocks some.

And JSR before you go off about the Pilot Volume, there is next to none. The piston is housed in about 6cm of 20mm PVC that's sleeved in the metal chamber. The PVC extends back into the reducer, giving the piston about 7mm to travel. The rest of the pilot volume is taken up by some rubber which doubles as a bumper.

Picture time...

Image
Image
Image
  • 0

Attachments
IMG_2829.JPG
Over-View
IMG_2829.JPG (38.77 KiB) Viewed 1483 times
Last edited by MrCrowley on Sun Mar 30, 2008 11:49 pm, edited 1 time in total.
User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: elitesniper » Fri Mar 07, 2008 8:20 pm

Very nice job Mr.C! i demand to see some damage! :x
  • 0

User avatar
elitesniper
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 8:23 pm

elitesniper wrote:Very nice job Mr.C! i demand to see some damage! :x

At 115psi...pfft. I doubt it'd do anything worth taking a picture over. :)
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: elitesniper » Fri Mar 07, 2008 8:24 pm

should do pretty good damge :P mabey on some, sheet metal or i dont know... plywood? :)
  • 0

User avatar
elitesniper
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 8:40 pm

Just got back from the first damage shots.

Managed to do 3 and a half (or 4, couldn't tell) soft drink cans at 105psi with a plastic 6mm BB. So i'm actually quite surprised at how powerful it is at such low pressures.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: elitesniper » Fri Mar 07, 2008 8:53 pm

not bad not bad at all Mr.c but im not impressred yet comon dont do these baby pressure :) , i wana see some 200psi+
  • 0

User avatar
elitesniper
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 8:59 pm

elitesniper wrote:I wana see some 200psi+
That's what i'm <A HREF="http://www.spudfiles.com/forums/viewtopic.php?p=162896&sid=77fc71cd8d5f894aaca1ae4fa03596dd#162896">trying to</a> achieve :)
  • 0

Last edited by MrCrowley on Fri Mar 07, 2008 9:01 pm, edited 1 time in total.
User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Sponsored

Sponsor
 


Unread postAuthor: pizlo » Fri Mar 07, 2008 9:00 pm

Nice job, my mini is a test for barrel sealers, and has the same rubber bumper/piston extender, and something to reduce pilot volume a bit, I'm gonna apoxy the rubber now, and then post some pics.
but yeah nice gun.
  • 0

User avatar
pizlo
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Dec 22, 2006 7:27 pm
Reputation: 0

Unread postAuthor: bigbob12345 » Fri Mar 07, 2008 9:09 pm

Very nice but isnt the chamber a little overkill

Edit:never mind didint relise you mentioned it
  • 0

User avatar
bigbob12345
Major General
Major General
 
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington
Reputation: 0

Unread postAuthor: chartreusesnot » Fri Mar 07, 2008 10:23 pm

What did you use to get the barrel inside the chamber? Epoxy? some devious sleeving technique? or are there threads on the other side of the reducer...?
  • 0

_Fnord wrote:OMG you have broked teh universe!!!11exclamationpoint!1!

http://www.youtube.com/watch?v=UnKN7LXqizw
http://www.youtube.com/watch?v=oVm_3eEPEgM
http://www.youtube.com/watch?v=wLNjMSGxp00
^^^^CLICK^^^^
User avatar
chartreusesnot
Staff Sergeant
Staff Sergeant
 
Posts: 109
Joined: Tue Jun 05, 2007 11:52 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 10:28 pm

To get the 6mm barrel inside the chamber, I drilled a hole in the end cap and JB-Welded it in.

But I think you're talking about the 20mm pipe I sleeved partway in the chamber, it just fit perfectly, though I did have to cut a groove for the seam (from the galvanised pipe) to run down.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: elitesniper » Fri Mar 07, 2008 10:30 pm

hey Mr.C how do you drill perfectly in the middle of the end cap? , i always move to the side just a little bit every time i drill something like that.
  • 0

User avatar
elitesniper
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm
Reputation: 0

Unread postAuthor: Novacastrian » Fri Mar 07, 2008 11:01 pm

First coax? Find that a bit odd Mr Modd man... Anyway it looks as though you have outdone the allblacks and are on a winner!

What happened to your hybrid plans?
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: MrCrowley » Fri Mar 07, 2008 11:03 pm

elitesniper wrote:hey Mr.C how do you drill perfectly in the middle of the end cap? , i always move to the side just a little bit every time i drill something like that.

I didn't drill perfectly in the middle for this one. But I was pretty darn close. Just use a centre punch, like the thing DYI used to penetrate 1/4" steel.

It's like a huge nail, and you whack it with a hammer where you want to drill and it should leave a small indent, this gives the drill bit something to hold on to and should drill right at that spot.

Novacastrian wrote:First coax? Find that a bit odd Mr Modd man... Anyway it looks as though you have outdone the allblacks and are on a winner!

What happened to your hybrid plans?

Yeah, never really interested me that much as I had no high pressure source.
Haha I guess so :)

Oh and i'm still working on my hybrid, my brother has been using the car on weekends because of some stupid sailing thing, so as soon as I get a chance I can drive out to a plumbing merchant and pick the rest of the stuff up.

I still need an ignition source and barrel on top of the chamber and reducers. But i've got the meter finished. :)

Damn, just realised i'm working next weekend, then on Monday I leave for Sydney for the week to see Ozzy in concert.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Novacastrian » Fri Mar 07, 2008 11:15 pm

MrCrowley wrote:Damn, just realised i'm working next weekend, then on Monday I leave for Sydney for the week to see Ozzy in concert.


There are worse places to go than Sydney, not many, but there are some. :twisted:
And screw you too- ozzy will be a good trip bro! :x :shock: :?
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Next

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'