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 83 users online :: 5 registered, 0 hidden and 78 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

n00b topic from BigBob

A place to ask general spud cannon related questions.
Sponsored 

What should I do

Choice number 1
1
13%
Choice number 2
1
13%
Choice number 3
2
25%
Choice number 4
1
13%
Choice number 5
2
25%
Choice number 6
0
No votes
Choice number 7
0
No votes
Choice number 8
0
No votes
Choice number 9
1
13%
Choice number 10
0
No votes
 
Total votes : 8
  • Author
    Message

n00b topic from BigBob

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 1:01 pm

Okay as the tilte says this is kind of a noob topic and there have been several similar ones lately but i seriously have $50 and no idea what to spend it on(not a lot to you but a hell of a lot of money to me).

1.Okay my thoughts are first a 158.276ci, 1.5in porting pvc triggered burst disk pnuematic. The problem with that is that it would be really annoying to pump up with such high volume estamated cost for that is $30.

2.Next turning my spray and pray into an advanced combustion but the problem is the chamber isnt pressure rated and i know people think non pressure rated pipe is fine for combustions but i am a cautious person.
101.75ci 2in porting exchangeable barrels, duel ignition, propane metered, chamber fan. Estimated cost $45. More money for something that would be less powerful than the first choice.

3.Make a mini adavanced combustion. 32.974ci 1in porting exchangeable barrels, duel ignition, propane metering, and a chamber fan. Estimated cost $40. the plus side of this over choice number two is that the chamber will be pressure rated.

4.start a metal high pressure triggered burst disk pneumatic similar to choice number 1 just out of metal. Estamated cost $120(I said start it I would finish it in a couple weeks if I do this).

5.Make a copper piston valved cannon. 30.171ci 1/2in porting QEV piloted.
estamated cost $50(there goes all my money)

6.make the excact same thing as in choice 5 just out of pvc. Estimated cost $10 :lol:

7.Save it up for a compressor.

8.Save it up for a regulated scuba tank setup.

9.Get a shock pump.

10. Make the high pressure pump in gippedo's tutorial.


If you have any other ideas of what I should do please suggest them.
  • 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: Jared Haehnel » Sat Mar 01, 2008 1:07 pm

A small advance combustion should be a lot of fun...make something that shoots Nerf darts 8)
  • 0

User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
Reputation: 0

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 1:09 pm

Definatly I have never made an adanced ombustion before and am keen to but the pnuematic ones do get more bang for the buck.
  • 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: Gippeto » Sat Mar 01, 2008 1:37 pm

Choice #5 AND choice #10. :D

Depending on what you have "laying" around, if you were to forego the qev, you would have enough for both. :D :D

I have been "eyeballing" my pump for several days now. Not having something to really utilize it's potential has been driving me up the wall.

Sooo.. I went down to Home Hardware, and bought most of the stuff I will need for a 1/2" barrel, 3/4" chamber (using cut offs from the pump here) barrel sealing piston.

Maybe a copper hammer-piston? So far I have spent $13.27
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 1:46 pm

for the copper gun i could pilot it with a 1/2in ball valve I have laying around instead of the QEV lowering the price to $30. and then Id have $20 to build your pump(might need to owe my dad some money).
But i would need to find a high pressure gauge which seems to not exist arond here I might have to order one online which i am not a fan of doing.
I dont have any of the required tools for soldering so that is why the copper gun is so much Im adding the price of the tools($10) to 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: bluerussetboy » Sat Mar 01, 2008 1:48 pm

why not # 5. there just isn't enough pretty copper launchers here. 3/4" piston made out of epoxy, 1/2" barrel 5' long and trigger it by a modded blowgun. no need for a QEV. use baby carrots for ammo and i'm guessing 800-900 fps for 500-600 ft. you'll probably want to build the high pressure pump also.

EDIT: you can epoxy the gun together. while i'm not a fan of using epoxy to attach fittings many people do use it.
  • 0

Last edited by bluerussetboy on Sat Mar 01, 2008 2:02 pm, edited 1 time in total.

bluerussetboy
1st Lieutenant
1st Lieutenant
 
Posts: 265
Joined: Fri Nov 02, 2007 12:25 pm
Reputation: 0

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 1:56 pm

I was thinking a 1in piston made of epoxy that ports to 1/2in beacause isnt the OD of 1/2in pipe larger than the ID of 3/4in pipe.
  • 0

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

Sponsored

Sponsor
 


Unread postAuthor: bluerussetboy » Sat Mar 01, 2008 2:07 pm

not even close

type L

1/2" OD .625"
3/4" ID . 785"

maybe a little close


for everything you need to know about copper.

http://www.copper.org/resources/pub_lis ... ndbook.pdf
  • 0


bluerussetboy
1st Lieutenant
1st Lieutenant
 
Posts: 265
Joined: Fri Nov 02, 2007 12:25 pm
Reputation: 0

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 2:11 pm

Oh, wonderful Ill probably still go for a 1in chamber because I want to get some good power but Ill do a 3/4in piston valve which would lower my price a couple dollars.

this does not mean I have made my choice on what to build I just saying if I build it this is what I will do.
keep your opinions coming
  • 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: bigbob12345 » Sat Mar 01, 2008 3:18 pm

A few more peoples opions would be nice
  • 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: MrCrowley » Sat Mar 01, 2008 3:27 pm

I find it best to work on more then one project at the same time, several reasons for this...

1) If you get pissed off with one project, (i.e you break a $7 guage, a $15 metal broided hose and a $15 regulator in the period of 15 minutes) you can just move on to another project to calm yourself down.

2) If you don't have the money to fund a project, but enough to start two or three, it's always more fun having more stuff to work on.

3) It's just fun working on a different project every now and then

4) No real time limit, you shouldn't have anyone breathing down your back asking when it will be finished, you just say you're working on three projects and they'll leave you alone.

:)
  • 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: bigbob12345 » Sat Mar 01, 2008 3:38 pm

I already have a couple projects that I have been working on the last couple of weeks but havent put much money into them. For example my mini coaxial, my 1/2in piston valve 3/8in porting, my 6mm chamber spray and pray the list goes on and on.
All those are nowhere near complete and i work on them when Im bored.
  • 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: bigbob12345 » Sat Mar 01, 2008 4:31 pm

Okay sorry for the double post but I am wondering if it would be ok to use that just for copper stuff instead of soldering at 300psi
  • 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: Gippeto » Sat Mar 01, 2008 6:18 pm

According to their data, the stuff has a shear strength of 710psi.

http://www.justforcopper.com/pdfs/Epoxy ... Sheet2.pdf


An example might be as follows;

3/4" type M od is .875". Joint length .75"

Area = pi *D *joint length

So... 3.14*.875 *.75

A =2.061 in2

So... 2.061in2 * 710psi

Fs= 1463.04 pounds

Divide by 4(Never trust things @ 100%) =356.76 pounds.(this is the allowable FORCE on the joint)

To get allowable PSI;

Using tube od of .875, Area of tube would be .601in2 (an end cap)

356.76pounds /.601in2 = 608.59 psi

To sum it up, you should be safe (IF you READ the instructions and follow them exactly) at 300psi.

Your life, or someone elses may depend on it. No joke!
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: bigbob12345 » Sat Mar 01, 2008 6:30 pm

Gippeto wrote: Your life, or someone elses may depend on it. No joke!


Well okay :lol: I think I'll use solder then unless normal high strength epoxy would be safer.
  • 0

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

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'