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 68 users online :: 3 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], Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Would this meter work?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Would this meter work?

Unread postAuthor: spudn00bie » Wed Jan 30, 2013 6:20 am

Would this meter work? I'm going for something like the meter from Ultimate Spud Gun
  • 0

Attachments
meter.png
meter.png (32.81 KiB) Viewed 775 times

spudn00bie
Private
Private
 
Posts: 4
Joined: Wed Jan 30, 2013 6:18 am
Reputation: 0

Unread postAuthor: CS » Wed Jan 30, 2013 6:49 am

On paper, yes.
In the shop, a bit harder.

The reason I say that is in the shop I have spent countless hours messing with o-ring seals. I have a lathe, and can still be a pain. If you have to use o-rings I suggest using a floating o-ring. Even though frustrating I do enjoy the stubborn route.

If your looking for less of a headache why not go with the traditional metering system? http://img117.imageshack.us/img117/7574 ... ted7gm.png
  • 0

User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Unread postAuthor: Zeus » Wed Jan 30, 2013 7:04 am

Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.
  • 0

/sarcasm, /hyperbole
User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Unread postAuthor: jackssmirkingrevenge » Wed Jan 30, 2013 8:33 am

CS wrote:The reason I say that is in the shop I have spent countless hours messing with o-ring seals. I have a lathe, and can still be a pain.


Not if you know what you are doing, o-rings are built to certain specifications and specific tolerances - and it doesn't take much to do some research and make sure you've got the right seals for the job at hand.

Here's a useful guide, there are plenty of others online: http://www.sealdynamics.com/o-ring-reference.pdf
  • 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: wyz2285 » Wed Jan 30, 2013 12:07 pm

Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.

For combustion you only need 3/2 valve, SB used 5/2 valve because hybrid need to be charged with air as well. Now thinking about it, I have 3 of these valves laying around doing nothing :lol: I wish I could get a bottle of propane to build a proper meter for my hybrid :roll:
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: MrCrowley » Wed Jan 30, 2013 6:47 pm

wyz2285 wrote:
Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.

For combustion you only need 3/2 valve, SB used 5/2 valve because hybrid need to be charged with air as well. Now thinking about it, I have 3 of these valves laying around doing nothing :lol: I wish I could get a bottle of propane to build a proper meter for my hybrid :roll:
Can't you find the right propane bottle? I was reluctant to buy the propane/MAPP bottles commonly seen on this forum when I found out that the camping ones are more or less the same size, have the same fitting, and cost $6 compared to $32 where I live. I think you mentioned you also needed the brass fitting for it too? That is problematic, I bought mine online from BCArms (an old spudgun run by a former member) but I think you can also find them at other places online that might post them to you.
  • 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: Zeus » Wed Jan 30, 2013 7:22 pm

Another option is the refillable propane tanks, I rely on 20lb tanks for my fridge and stove, a refill or exchange is about $20-30, and you get 20 times the amount of propane. You can even refill smaller containers, and there's no need to muck around tapping a blowtorch head, just buy a $8 POL fitting with 1/4" NPT, chuck a reg and hose barb on, and you'll be set.
  • 0

/sarcasm, /hyperbole
User avatar
Zeus
Major General
Major General
 
Posts: 1422
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt
Reputation: 2

Sponsored

Sponsor
 


Unread postAuthor: spudn00bie » Wed Jan 30, 2013 11:18 pm

Its illegal to refill your own propane tanks in Ontario.
  • 0


spudn00bie
Private
Private
 
Posts: 4
Joined: Wed Jan 30, 2013 6:18 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Jan 31, 2013 12:55 am

spudn00bie wrote:Its illegal to refill your own propane tanks in Ontario.


Is it legal to build a spudgun ;)
  • 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: matti » Thu Jan 31, 2013 10:30 am

It would work, but you need to make sure that the valve closes fuel input before it starts to "open" to chamber.. to be accurate it needs to -> fill meter -> close fuel input -> open outlet to chamber.
  • 0

User avatar
matti
2nd Lieutenant
2nd Lieutenant
 
Posts: 232
Joined: Tue Oct 04, 2005 1:01 pm
Reputation: 9

Unread postAuthor: mobile chernobyl » Thu Jan 31, 2013 11:51 am

I've made my own propane tanks before - they can be convenient sometimes when you need a special size or form factor!

Image
  • 0

User avatar
mobile chernobyl
Colonel
Colonel
 
Posts: 732
Joined: Sun Dec 03, 2006 11:53 am
Reputation: 9

Unread postAuthor: wyz2285 » Thu Jan 31, 2013 1:02 pm

I decided to make myself a portable propane tank that I can refill when connected with a domestic use propane tank. The liquidating pressure is around 8.6 bar at 21 degree Celsius right? Portugal isn't a hot country so it shouldn't get more than 15 bar even at summer (30-35 Celsius max). Is it ok to use pneumatic components with it? I know that air regulators don't but valves should be fine I think. I'm thinking about install a flow control valve on it and hopefully manometric fueling.
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'