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 74 users online :: 4 registered, 0 hidden and 70 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Easy 200psi... er make that 400psi stirrup pump

A place to ask general spud cannon related questions.
Sponsored 

If approved by the mods, is there a need for a how to on this pump and check valve

Poll ended at Fri Feb 29, 2008 9:24 pm

Yes, I would like detailed information.
14
100%
No, blow it out your ear!
0
No votes
 
Total votes : 14
  • Author
    Message

Easy 200psi... er make that 400psi stirrup pump

Unread postAuthor: Gippeto » Fri Feb 22, 2008 8:02 pm

I was thinking about a pump design the other day. Nothing revolutionary, just something that could be built by the average spudder with average tools. Something with (maybe) better efficiency than average.

Since I could not stop thinking about it, I went ahead and built it. Here it is, ready for comment.

Only power tool used: drill press

Cost to build: About 20.00 for the pump and check valve. Another 10.00 for the manifold. Gage and valve belong to my work.

Performance: 4 strokes brings the gage over 200 psi. :D

Thanks for looking, let me know what you think.

Edit: Added piston pic
The copper tube is 3/4" type M
Dead space approx. 0.1cu.in.
Mechanical compression ratio 103:1 :D

Edit: Finished testing pump. Pressured to ~408psi. Held for 3 hours, then re-checked clearance at pump handle. No change. Uploading pic.
  • 0

Attachments
4 strokes 200+psi.jpg
Finished pump.jpg
Assembled showing air gap.jpg
Piston detail. The threaded rod has two flats filed into it to allow air to flow past the nut.
Check valve parts.jpg
Pump making 408psi.jpg
Last edited by Gippeto on Mon Feb 25, 2008 2:39 pm, edited 5 times in total.
"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: Maniac » Fri Feb 22, 2008 8:05 pm

oh goody may you explain the o ring setup in it. and what size copper that is.
  • 0

Coodude26 wrote:
People who laugh really hard at stuff that pisses you off/you getting hurt, who then say "I'm sorry, I can't stop" but you know they easily could.

Mr.C: That's not as easy as you think. It's like me kicking you in the balls and telling you to stop crying.
User avatar
Maniac
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 496
Joined: Tue Oct 23, 2007 5:55 pm
Location: Right behind you
Reputation: 0

Unread postAuthor: pizlo » Fri Feb 22, 2008 8:35 pm

Please explain, and how bis is the chamber you're brining to 200 PSI?
  • 0

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

Unread postAuthor: Gippeto » Fri Feb 22, 2008 9:40 pm

Added poll.

Maniac,

On the intake (up) stroke, the o-ring is pushed against the bottom washer. Air enters at the gap above the o-ring and follows two passages (filed into the threaded rod) past the nut.

On the compression (down) stroke, air pressure pushes the o-ring against the upper washer and the cylinder wall, forming a seal.

As the air is compressed, the check valve reaches a point (cracking pressure) where it opens and lets the air into the manifold (and a spudgun maybe?). When the manifold pressure and spring pressure equal the cylinder pressure, the check valve seals, allowing another intake stroke.

Pizlo,

I hope I explained what you wanted, you were not very specific. I installed the pump on a manifold with a tee, gage, and venting valve. This was in the pictures. It's probably about 2 cu.in.?
  • 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: VH_man » Fri Feb 22, 2008 10:00 pm

The o-ring thing looks complex but also easy to contsruct.

and is that epoxy i see? JSR is going to be proud.
  • 0

User avatar
VH_man
Major General
Major General
 
Posts: 1827
Joined: Sat Dec 09, 2006 6:00 pm
Location: New Hampshire
Reputation: 1

Unread postAuthor: Novacastrian » Fri Feb 22, 2008 11:32 pm

That is one sexy piston, great work mate.
  • 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: jackssmirkingrevenge » Sat Feb 23, 2008 12:57 am

VH_man wrote:and is that epoxy i see? JSR is going to be proud.


It was the first thing to catch my eye, looking VERY good :D

Those of you with copper launchers, please take note ;)
  • 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

Sponsored

Sponsor
 


Unread postAuthor: MrCrowley » Sat Feb 23, 2008 1:00 am

If approved by the mods, is there a need for a how to on this pump and check valve


You don't need to approve, just go ahead and do it :)

And no, I don't think you can change the picture order without removing them and then reuploading them.
  • 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 » Sat Feb 23, 2008 1:11 am

that very neat, good job on the pump :)
  • 0

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

Unread postAuthor: Brian the brain » Sat Feb 23, 2008 1:58 am

where did you get that checkvalve?
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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: Gippeto » Sat Feb 23, 2008 2:07 am

Thanks, it was a fun little project.

Nova, we need to find you a lady friend! :lol: But thanks all the same.


Pictorial on photobucket. Check valve and piston.

http://s245.photobucket.com/albums/gg76 ... k%20valve/


I'll sit down and flush out the instructions this weekend.

Comments with details anyone would like clarified might be of help.
  • 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: jackssmirkingrevenge » Sat Feb 23, 2008 2:11 am

Gippeto wrote:I'll sit down and flush out the instructions this weekend.


:shock:

Good lord, we have another one! scroll down :)

:D
  • 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: Mitchza89 » Sat Feb 23, 2008 4:26 am

She's a little beauty mate, really well done on this one. That reminds me, I better post my homemade pump I made a few weeks a go :D

Although you've gotten to 200psi, what's the psi max your after?

Well done again mate,

Mitch.
  • 0

Image
User avatar
Mitchza89
Brigadier General
Brigadier General
 
Posts: 1056
Joined: Tue Jan 09, 2007 12:05 am
Reputation: 0

Unread postAuthor: bluerussetboy » Sat Feb 23, 2008 12:47 pm

so your piston is basically a copy of the piston found in shock pumps, made of nuts and bolts, not a piece of aluminum nicely machined?

what do you think your check valve is rated for max? 200 psi? 300 psi? 400 psi?
if it can't go over 250 psi then i might as well just buy a brass 3/4" check valve from lowe's or home depot or any plumbing supply.

200 psi in 4 pumps in a closed tee doesn't really tell us much other than your pump can fill a small tee and hold 200 psi.
if i cap my fox hp pump it takes less than 5 strokes to max out at 300 psi.
i would prefer to know how many strokes it takes to fill a chamber that is 24" long of 3/4"(.785) copper or 11.616 cu. in. of volume to 200 psi. this would be more a "real world" measurement.
  • 0


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

Unread postAuthor: Gippeto » Sat Feb 23, 2008 2:29 pm

Er, um ok... I'll add more detail to the instructions.

This was not really so much a case of max psi. I have calculated that 300 psi will take a force of 154.5 pounds to achieve. If someone needs more pressure, they can either work harder :) or use a smaller diameter tube/piston.

The premise for this pump was to make something which a lot of people would have the tools to replicate. If I were to fire up the lathe, then sure I could make a pump with virtually 0 dead space, and a check valve good to whatever pressure I wanted. But there would be only a few here that could reproduce it.
I believe that the check valve will easily go past 250psi, but no, I have not calculated a max rating. Even if I were to crunch the numbers, different manufacturing techniques (silver soldering ,sweating, epoxying) would alter the properties of the material sufficiently to render the result useless.
The primary reason for building a check valve, was to reduce the amount of dead space in the pump. With your wog check valve from lowes, you have a lot of dead space (comparatively). This would require a larger swept volume to achieve a similar pressure increase.
And Finally, in an ideal world, your chamber would take 14 strokes to fill to 200psi. So in a real world, lets say less than 20.
It may not be the solution for everyone, but it should suffice for many.
  • 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

Next

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'