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Modded Elbow?

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.
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Modded Elbow?

Unread postAuthor: THUNDERLORD » Wed Apr 16, 2008 2:05 am

Does anyone know how to modify an elbow or T fitting like in clide's GB semi ?

I read all 7 pages of his post looking for more information on it.
But there's no details on how to shorten up the connections like that.

I would like to know how to "mod an elbow" or T fitting for a 3" or 4" to 3"
pipe to shorten it for an over under design.

Thanks in advance for any advice on that. I will check back later.
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Unread postAuthor: psycix » Wed Apr 16, 2008 4:19 am

Why would you shorten up the connections?
I think it would give a big chance of leaks.
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Unread postAuthor: jrrdw » Wed Apr 16, 2008 7:36 am

Are you talking about the distance between 2 fittings?
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Unread postAuthor: grumpy » Wed Apr 16, 2008 8:37 am

looked to me like he sleaved a larger 90 so that a smaller 90 would fit in tight and glued it in.
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Unread postAuthor: biggsauce » Wed Apr 16, 2008 9:08 am

Would street elbows help you out? If so, you caould use an already made part and save you some trouble. Look at this one http://www.spudfiles.com/forums/viewtopic,p,174884.html#174884

I used them and id you are trying for the over-under look, this will put your barrel and chamber right close to each other which is what I assume you're looking for?
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Unread postAuthor: THUNDERLORD » Wed Apr 16, 2008 10:22 am

Thanks for the replies, :wink:
@jrrdw Yes, I want to shorten up the distance for over/ under between fittings.

@grumpy, I'll have to check which ones fit in which other T's and elbows
Just haven't found any yet.
and I've gotten pretty comfortable just standing around/looking in home depot

@ biggsauce, thanks, your reply looks the most promising, So that's it!! (not like clide's design but what I'm looking for)
that sure is a clean look the way you used "street elbows"on the intimidator cannon.
Even my 1" pipes are kind of far apart and I want to design a 3" or 4"
over under but I hadn't seen any in the local home depot here.
Thanks fellas, I got to run to an appt. so I'll get back later 8)
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Unread postAuthor: Fnord » Wed Apr 16, 2008 11:51 am

You could always cut up a pipe nipple and pull one of these:
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Unread postAuthor: clide » Wed Apr 16, 2008 3:32 pm

I believe I just used a 2" elbow with one end cut down, a cut down 2"x1.5" bushing, and a 1.5" street elbow, but that series of fittings was because I needed special ends on the other sides of the elbows.

For a more normal gun you could probably just use one normal elbow and one street elbow and cut them down if you need it closer. However I wouldn't suggest cutting it down if the elbow is going to be part of the chamber. Even for that piece that was part of the barrel I was very careful to make the parts fit together VERY tightly so I would get a good bond on the limited length of my socket.
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Unread postAuthor: THUNDERLORD » Thu Apr 17, 2008 11:35 am

clide wrote:I believe I just used a 2" elbow with one end cut down, a cut down 2"x1.5" bushing, and a 1.5" street elbow, but that series of fittings was because I needed special ends on the other sides of the elbows.

For a more normal gun you could probably just use one normal elbow and one street elbow and cut them down if you need it closer. However I wouldn't suggest cutting it down if the elbow is going to be part of the chamber. Even for that piece that was part of the barrel I was very careful to make the parts fit together VERY tightly so I would get a good bond on the limited length of my socket.


Wow!!! Thanks for replying clide, :)
BTW I think your GB semi really deserved the award.
I probably should have asked this one as a reply to your post but I didn't know if you'd respond.

Also I was thinking this topic would make a great how-to since it really gives a more compact design and also has benefits as far as the pressure rounding corners probably.
Maybe yourself or someone could do one on that?

@Fnord, thanks for the pic, I've been thinking about getting another oxy- acetylene torch for welding.
The ones for HVAC seem to be priced the best (around 100$).

BTW I don't usualy check out the hybrids but your Thunderstruck is my favorite on there!!!
Also I have some design info I'll be trying to get together, that could be useful involving a component I call a "thunderswitch".
It would be simple to combine with JSR's blow forward bolt I dicussed with JSR.
:wink: http://www.spudfiles.com/forums/6mm-semi-added-trigger-and-mag-t10075.html He was nice enough to give me a diagram here:http://www.spudfiles.com/forums/solenoid-valve-question-t13966.html (on that diagram at the bottom, the control that alternates filling and firing valve would be a "thunderswitch")
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