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 69 users online :: 4 registered, 0 hidden and 65 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

piston gun help!!!

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

piston gun help!!!

Unread postAuthor: jsefcik » Sat Sep 10, 2011 12:07 am

Im planning on build a mini piston gun, just to screw around with but came to one problem

I want to take a 3/4 inch by 1/2 copper reducer copper fitting and sand the lip that makes the pipe only go in so far, if i sand the lip off where the 1/2 inch copper pipe goes in,

When i go to solder it will solder just fall through?


11 views, no responses ???
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jrrdw » Sat Sep 10, 2011 8:05 am

"When i go to solder it will solder just fall through?"

Depends on how much solder you use and how well you control the heat. One good thing about working with copper, you can redo it if you mess up as long as it aint to bad of a mistake. Practice, practice and practice some more, it's really not that hard to do.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: Fnord » Sat Sep 10, 2011 9:04 am

It'll work fine, just check the fit often as you file the lip out. Avoid removing too much material.
Many here including myself have done what you're asking so it's not too difficult.
  • 0

User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: Technician1002 » Sat Sep 10, 2011 10:10 am

Solder will wick into the joint when the pipe is clean, the temperature is correct, and there is a little flux. You can even solder uphill on a pipe in the wall. Apply a little solder to the joint and watch it wick up into the joint. Keep adding solder until no more wickes into the joint and the solder starts to form a puddle. Done.

It will quite literally suck up into the joint by capillary action.

If the joint is overheated, the pipe oxidized, or no flux, the solder will ball up and fall off. Do not solder over a nice carpet or anything else you don't want molten metal dripped on.
Image
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: jsefcik » Sat Sep 10, 2011 11:20 am

Thanks guys!!!!,

All the copper parts i get for free, Where i go to school
there is a box with scrap pieces that I can use. just got to clean them up a lil bit


you guys have any ideas what works good for a piston going 3/4 inch copper pipe, and sealing up against 1/2 inch copper tubing

was think of a bolt and washer or a piece of 1/2 copper tubing with washers to stablize it on both ends and rubber washer on the front and o ring on the back, with a bolt going though the center to hold in all in place
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: mark.f » Sat Sep 10, 2011 11:42 am

jsefcik wrote:you guys have any ideas what works good for a piston going 3/4 inch copper pipe, and sealing up against 1/2 inch copper tubing


I used different sized washers to form an o-ring groove. They don't exactly have to have the same inner diameter as your bolt/threaded rod, you can build up the diameter of that with teflon or electrical tape and trim to length with a razor blade.

Image
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3465
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: jsefcik » Sat Sep 10, 2011 12:46 pm

mark.f wrote:
jsefcik wrote:you guys have any ideas what works good for a piston going 3/4 inch copper pipe, and sealing up against 1/2 inch copper tubing


I used different sized washers to form an o-ring groove. They don't exactly have to have the same inner diameter as your bolt/threaded rod, you can build up the diameter of that with teflon or electrical tape and trim to length with a razor blade.

Image



I found a socket works really well, i might just stick with 1/2 copper all the way through,

but just gotta find the right piston to use

what size pipe is that piston made for?

do you have plans???
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: mattyzip77 » Sat Sep 10, 2011 2:02 pm

Plans for what??? obviously its a bolt washer piston with a o ring, rubber sealing face, and different size nuts and bolts. :dontknow: :dontknow:
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: jsefcik » Sat Sep 10, 2011 6:15 pm

so was gun freaks but he gave plans
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: MrCrowley » Sat Sep 10, 2011 6:50 pm

Gun Freak was being extremely nice. Our slogan may as well be "Spudfiles: Don't expect plans".

I'm sure you have the capacity to go to a hardware store and pick stuff off shelves and try fit them inside a piece of pipe that will be your piston housing.

Actually, why don't you just scale Gun Freak's plans down to the right size? How hard can it be? :?
  • 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: mattyzip77 » Sat Sep 10, 2011 8:14 pm

MrCrowley wrote:Gun Freak was being extremely nice. Our slogan may as well be "Spudfiles: Don't expect plans".

I'm sure you have the capacity to go to a hardware store and pick stuff off shelves and try fit them inside a piece of pipe that will be your piston housing.

Actually, why don't you just scale Gun Freak's plans down to the right size? How hard can it be? :?

Because he cannot do anything for himself and expects everyone to do everything for him, that is why!!
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: jsefcik » Sat Sep 10, 2011 9:14 pm

MrCrowley wrote:Gun Freak was being extremely nice. Our slogan may as well be "Spudfiles: Don't expect plans".

I'm sure you have the capacity to go to a hardware store and pick stuff off shelves and try fit them inside a piece of pipe that will be your piston housing.

Actually, why don't you just scale Gun Freak's plans down to the right size? How hard can it be? :?




im gonna use a 1/2 copper pipe about 2 inches with bolt through the center and metal washer and rubber washer in front for a sealing face then a o ring in the back


matty i can do things on my own, i just like asking quesitons


if i cant get the pipe piston to work, im going towards a bolt and washer
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: mattyzip77 » Sun Sep 11, 2011 11:43 am

yes true, you were able to glue the bushing to your barrel and screw it on the piston housing!!! good job dude!!! :idea: :idea:
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: jsefcik » Sun Sep 11, 2011 8:20 pm

mattyzip77 wrote:yes true, you were able to glue the bushing to your barrel and screw it on the piston housing!!! good job dude!!! :idea: :idea:



thanks dude!!!!
  • 0


jsefcik
Brigadier General
Brigadier General
 
Posts: 1132
Joined: Tue Jun 07, 2011 10:11 am
Reputation: 0

Unread postAuthor: jhalek90 » Mon Sep 12, 2011 12:35 am

Image

Rubber cork. Best piston in the world, IMO.

they cost about 50 cents.... and they come in copper pipe sizes!
Most hardware stores carry them... most big box stores don't.

Also, if you use of of these, you dont even need a bumper.... as the piston is solid rubber...

No bumper, no sealing face to worry about.... i made a 1/2'' porting piston valve with one of these.... it has been shot at 500psi many times. (100+)

EDIT: The taper even works as a check valve, (kinda) if you use the right size.... just put the wide end facing your sealing face.

Im sure you dont need plans for a 1 piece piston. (sarcasm)
  • 0

jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'