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 70 users online :: 5 registered, 0 hidden and 65 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

1st pneumatic Chrony Results!

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

Unread postAuthor: mtronic » Tue Oct 30, 2007 7:33 pm

nice pneumy, try the sprinkler valve trouble shooter? It helped me heaps when I did my sprinkler valve.

JSR: there hasn't yet been a situation that you havent been able to post some kind of crazy/funny pic. Good show
  • 0

Always out numbered....
never out gunned
User avatar
mtronic
1st Lieutenant
1st Lieutenant
 
Posts: 292
Joined: Sat Jun 23, 2007 6:21 am
Location: everywhere at once
Reputation: 0

Unread postAuthor: ShowNoMercy » Tue Oct 30, 2007 7:37 pm

Did you get the right type of threaded barb? The threads although highly unlikely may be different styles.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: Lentamentalisk » Tue Oct 30, 2007 9:56 pm

They screw in perfectly, there is just a slight gap, so that when I pump it up to anywhere over 40psi and stick the blowgun into a bucket of watter, there are lots of bubbles coming up.
  • 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: Lentamentalisk » Tue Oct 30, 2007 10:59 pm

Here is a picture of where the leak is coming from. I don't think that there is a crack because that doesnt seem to be where the leak is coming from, but correct me if I am misunderstanding, that the crack would be on the blowgun, or would it be on the hose barb?

Image
  • 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: MrCrowley » Tue Oct 30, 2007 11:06 pm

I've had a brass fitting crack on me, it was hairline, I could hardly see it at all.

Did you wrap the brass fitting in teflon tape?
  • 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: Lentamentalisk » Tue Oct 30, 2007 11:09 pm

Lentamentalisk wrote:I have tried resealing it with PTFE tape, as well as the gooie pipe thread compound, neither of which worked.


yes I did
  • 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: MrCrowley » Tue Oct 30, 2007 11:12 pm

Ah right so you have, I can't see any teflon tape on the fitting at all, so maybe put some more on or do the underwater bubble test to see if the fitting is leaking or cracked.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Tue Oct 30, 2007 11:15 pm

mtronic wrote:JSR: there hasn't yet been a situation that you havent been able to post some kind of crazy/funny pic. Good show


chances are that if you've thought of something, then a) so has someone else b) they've made a picture about it and c) you can find it with google image search ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Lentamentalisk » Tue Oct 30, 2007 11:23 pm

MrCrowley wrote:Ah right so you have, I can't see any teflon tape on the fitting at all, so maybe put some more on or do the underwater bubble test to see if the fitting is leaking or cracked.


sorry of the confusion. I just screwed the blowgun on to show where the leak was from. I had already taken it apart after the leak to see what was wrong.
I guess I have to admit that I bought the valve off of BCARMS, and it leaked when I got it. I will get in contact with the owner asap about it.

edit: Contacted, and Brian sent me a new blowgun and hose barb to replace the faulty parts! That is what I call great service!
  • 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: Lentamentalisk » Tue Nov 06, 2007 7:49 pm

New Damage Pix!

block of balsa that I shot. Veered up because of its instability, embedding itself in the chair I used as a safety net. (later to be used as a sabot for small heavy things)
Image

Sharpened bolt
Image

Bolt in tea light sabot
Image

No penetration because the bolt didnt hit straight on. Looks like it never even left the candle
Image

Shotgun shot of nail darts with string taped on their ends to make them fly straight, using a home made sabot made out of stiff paper
Image

Fairly accurate if I do say so myself
Image

Using the block of balsa for a sabot because the one I made got crushed when the boards fell on it. Not so accurate : )
Image

Firing a ~1"x1" piece of metal bar that I found in my school's weight room, with the balsa as a sabot (no pic of ammo, because I lost it). Exit hole:
Image

Where it bent the chair out of the way as it passed through unhindered, never to be found again:
Image
  • 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: Lentamentalisk » Tue May 06, 2008 9:36 pm

I just got a chrony for my B-Day and so I decided to clock this old cannon. To my suprise, it was far better than I though it was. Here are the results:
80psi: 299.9fps
100psi: 339.5fps
125psi: 338.0fps
140psi: 408.7fps
Here is my setup:
Image

Videos:
80psi shot
100psi
120psi
140psi
  • 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: bigbob12345 » Tue May 06, 2008 11:04 pm

Cool pnuematic
nice and simple
I am also very surprised ny the chrony results, with a chamber that small I would have excpected much lower results :?
But the more power the better I guess :)
  • 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: starman » Tue May 06, 2008 11:58 pm

MrCrowley wrote:I've had a brass fitting crack on me, it was hairline, I could hardly see it at all.


I've had brass fittings hairline crack on me too. All it takes is a leveraged hit or drop at the wrong angle and you're screwed.

Also check to make sure your threads are burr and gap free in your blow gun.
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: Lentamentalisk » Wed May 07, 2008 12:02 am

Its all working now. Turns out it was the piston/diaphragm thing. Where the screw was that held in the rubber sealing face, there was a big o'le hole. Filled it with GOOP and its all better.
  • 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: THUNDERLORD » Wed May 07, 2008 2:25 am

Good video, I wish I had a chronograph.
400 fps is fast for a tennis ball too. 8)
  • 0


THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'