Pistons

Just starting to spud and wonder how long your barrel should be? Want to know how to build a better cannon? This is just the place! If you think your question is one of a newcomer, please post it in here. If your question is posted elsewhere, and it's a newcomer's type question, it will be moved in here.

Postby MX_ » Tue Nov 07, 2006 2:57 pm

I am planning on making a piston valve, but I don't really understand how they work fully.

I have a 1 1/4 tee. And for a piston, I was going to use a piece of 1 1/4" pipe, with a plug in the end. I don't really see how to make that fit inside my tee, I tried sanding it down with a sanding drum but the drum just squeals and gets stuck in the tee.

Barrel----Pilot
..........|
....Chamber

What should I use for a piston in the 1 1/4" tee instead if my idea wont work? If my tee size is complete junk, then what size should I use to make this easy on me?

I was planning on making a gun to shoot D Cell batteries.
MX_
 
Posts: 45
Joined: Thu May 18, 2006 5:51 pm
 

Postby shadowscion » Tue Nov 07, 2006 4:35 pm

There is a link at the top of the pneumatics section telling how pistons work visually. Try something other than trying to fit a 1 1/4" inside of another 1 1/4". For the piston Just go to the hardware store, find the size tee you are using, and go around fitting stuff inside of it and find what fits best.
shadowscion
 
Posts: 467
Joined: Tue Mar 01, 2005 9:24 pm
Location: USA
 

Postby MX_ » Tue Nov 07, 2006 6:12 pm

I understand how they work, it's more how I put one together.

I'm sure people have had good experiences with different piston materials/tees to fit them in and I was just curious as to what would work well in a 1 1/4" tee.

I know someone has used a D Cell battery for a piston, but I assume that isn't so smart because if the battery breaks, then all the corrosive materials inside get out.

EDIT:
<img src="http://xs108.xs.to/xs108/06453/Gun.png">

Which way would work better for an equalization hole?

Also, what would I use to close off the pilot side of the tee? Just a 1 1/4" cap?
MX_
 
Posts: 45
Joined: Thu May 18, 2006 5:51 pm
 

Postby TurboSuper » Tue Nov 07, 2006 6:57 pm

Not to mention a battery is rather heavy for the application.
TurboSuper
 
Posts: 1405
Joined: Thu Apr 21, 2005 3:29 pm
Location: Canada
 

Sponsored

Sponsor
 
 

Postby shadowscion » Tue Nov 07, 2006 7:04 pm

Where is the barrel?
shadowscion
 
Posts: 467
Joined: Tue Mar 01, 2005 9:24 pm
Location: USA
 

Postby MX_ » Tue Nov 07, 2006 7:07 pm

<img src="http://xs108.xs.to/xs108/06453/Gun1.png">
MX_
 
Posts: 45
Joined: Thu May 18, 2006 5:51 pm
 

Postby shadowscion » Tue Nov 07, 2006 7:10 pm

I don't think that will work. If I remember what I read,your barrel has to be smaller then the face of your piston. The barrel end of your tee has to have a bushing in it, and the barrel is pushed through it toward the rear of the tee.
shadowscion
 
Posts: 467
Joined: Tue Mar 01, 2005 9:24 pm
Location: USA
 

Postby MX_ » Tue Nov 07, 2006 7:12 pm

Ok, thanks.

If I change the tee to a 2" tee, is there anything that would be a good fit. I hear that 1 1/4" fittings fit good in a 2" tee. Any word on that?
MX_
 
Posts: 45
Joined: Thu May 18, 2006 5:51 pm
 

Postby shadowscion » Tue Nov 07, 2006 7:13 pm

Yes thats what I am working on at the moment, 1 1/4" fittings fit in 2" tees, but I was told that they should be wrapped in something or have an o ring on them for better fit.
shadowscion
 
Posts: 467
Joined: Tue Mar 01, 2005 9:24 pm
Location: USA
 

Postby MX_ » Tue Nov 07, 2006 7:23 pm

Duct tape?

I just had an idea. Could I take a section of 1 1/4" pipe, and wrap it in enough duct tape to fit snugly in the 2" tee?
MX_
 
Posts: 45
Joined: Thu May 18, 2006 5:51 pm
 
 
Next

Return to Frequently Asked Questions aka The Newbie Corner

cron