What should I make the piston out of?

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
Post Reply
User avatar
maverik94
Corporal
Corporal
Posts: 558
Joined: Wed Jan 21, 2009 4:48 pm

What would be the best material to make a piston out of for a spring-piston air rifle? Or can I buy something? Thanks in advance!
"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Current Project: None, I'm in Spudremission.
Top
User avatar
MountainousDew
Specialist 2
Specialist 2
Posts: 230
Joined: Tue Apr 14, 2009 6:06 pm

What size are we talking bout?
<a href="http://s709.photobucket.com/albums/ww95 ... =MDSig.jpg" target="_blank"><img src="http://i709.photobucket.com/albums/ww95 ... /MDSig.jpg" border="0" alt="Photobucket"></a>
Top
User avatar
maverik94
Corporal
Corporal
Posts: 558
Joined: Wed Jan 21, 2009 4:48 pm

3/4" or so (message toooooooooooooo short...there we go)
"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Current Project: None, I'm in Spudremission.
Top
User avatar
qwerty
Corporal 2
Corporal 2
Posts: 678
Joined: Sun Apr 12, 2009 2:16 am

alluminium light and very strong
I visit occasionally to make unrelated posts.
Top
User avatar
maverik94
Corporal
Corporal
Posts: 558
Joined: Wed Jan 21, 2009 4:48 pm

1) I dont have a lathe, 2) how would it seal?
"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Current Project: None, I'm in Spudremission.
Top
User avatar
grock
Specialist 2
Specialist 2
Posts: 231
Joined: Mon Dec 29, 2008 2:59 pm

cant fix the lathe part, but use O rings to seal it
Top
User avatar
maverik94
Corporal
Corporal
Posts: 558
Joined: Wed Jan 21, 2009 4:48 pm

I would need a lathe to cut the grooves for the o-rings
"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Current Project: None, I'm in Spudremission.
Top
User avatar
grock
Specialist 2
Specialist 2
Posts: 231
Joined: Mon Dec 29, 2008 2:59 pm

some people used a drill press, and chucked the part in the drill
Top
User avatar
MountainousDew
Specialist 2
Specialist 2
Posts: 230
Joined: Tue Apr 14, 2009 6:06 pm

Put the stock in the chuck and spin it against a exacto knife...
<a href="http://s709.photobucket.com/albums/ww95 ... =MDSig.jpg" target="_blank"><img src="http://i709.photobucket.com/albums/ww95 ... /MDSig.jpg" border="0" alt="Photobucket"></a>
Top
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 26219
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 581 times
Been thanked: 347 times

maverik94 wrote:3/4" or so
shotgun wad :)
Top
MRR
Specialist 3
Specialist 3
Posts: 361
Joined: Tue Feb 17, 2009 2:29 pm

Try hard rubber door stopper. These things you screw onto the floor.
Top
User avatar
Technician1002
Captain
Captain
Posts: 5189
Joined: Sat Apr 04, 2009 11:10 am

Parts with rings can be made on a drill press.

The two pictures are two different valves. One is a piston for a coaxial called the Mouse Musket and the other is a QDV style for the Marshmallow Cannon.

The rings are floating and do seal well.

The materials are HDPE and UMHWHDPE.
Attachments
Making round to size in drill press.
Making round to size in drill press.
O rings on 1 inch valve Note away from the chuck, tool chatter was a problem.
O rings on 1 inch valve Note away from the chuck, tool chatter was a problem.
piston rings.jpg (29.92 KiB) Viewed 3081 times
Last edited by Technician1002 on Wed Jun 24, 2009 2:12 pm, edited 2 times in total.
Top
User avatar
maverik94
Corporal
Corporal
Posts: 558
Joined: Wed Jan 21, 2009 4:48 pm

ok, I will try that, thanks!
"You can't be friends with anyone if you aren't friends with yourself."
"I'd rather be hated for who I am, than loved for who I'm not." -André Gide
Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
Defeat is always momentary.
–Carl Denham

Current Project: None, I'm in Spudremission.
Top
Post Reply

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post

Return to “Pneumatic Cannons”