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Possible to avoid a floating barrel with bolt action?

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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Possible to avoid a floating barrel with bolt action?

Unread postAuthor: Truck » Wed Jan 04, 2012 6:24 am

Hey guys, I am fairly new to spud gunning, however I have done my research, and I have been having trouble finding a solution to my problem.
This is to have a bolt action breech that does not leak, and the barrel is not 'floating'.

So far I have not found anything on this specific problem, and any help would be greatly appreciated. :D
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Unread postAuthor: POLAND_SPUD » Wed Jan 04, 2012 7:02 am

well you should have read this thread >> http://www.spudfiles.com/forums/uhmmm-2 ... ter,0.html

that works the way you want it
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Unread postAuthor: evanmcorleytv » Wed Jan 04, 2012 11:13 am

"O" rings are you're best friend in this situation..
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Unread postAuthor: Truck » Wed Jan 04, 2012 7:52 pm

POLAND_SPUD wrote:well you should have read this thread >> http://www.spudfiles.com/forums/uhmmm-2 ... ter,0.html

that works the way you want it


Thank you! I have come up with a design that I think will work, I will post pictures up soon :)
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 05, 2012 1:22 am

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Unread postAuthor: Truck » Thu Jan 05, 2012 3:12 am

Thanks JSR, but i was looking at a design more like the one posed below, and critiques would be greatly appreciated, where I can improve the design etc! :)

I am having trouble uploading to here is the image.

What I was going for here is to have three pieces of copper or brass tubing the middle being the barrel with a diameter of 13mm, the second being the bolt tube with a handle attached to it, and the third being the bolt guide and casing, this has epoxied discs at either ends and this will hopefully minimize leakage. :roll:
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 05, 2012 3:21 am

Looks good, the "sleeve" bolt has been used before successfully. Heck, there even is aprimitive instructable ;)
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Unread postAuthor: Truck » Thu Jan 05, 2012 3:31 am

jackssmirkingrevenge wrote:Looks good, the "sleeve" bolt has been used before successfully. Heck, there even is aprimitive instructable ;)


Thank you :)

Haha, that instuctable is so dodgey! But thanks, I seem to get the idea now :idea:
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 05, 2012 3:40 am

Here's a better rendering from 3D-master-but-soon-to-have-keen-competition dewey ;)

Image

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Also, instead of a sliding sleeve, you might want to consider a rotating one as suggested here.

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Unread postAuthor: Truck » Thu Jan 05, 2012 4:03 am

Wow, simplicity is beautiful isn't it?

That rendering is quite handsome, would you not agree ;) I like the idea of having just a rotating breech load, but I have some queries:

1. Would I need to make use of O rings? and if so would the rotation become difficult and less ergonomic?

2. Would it leak/cause significant power dampening on the rifle?

Sorry for all the questions, I just want this to be theoretically beautiful before I put it into practice. :roll:
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 05, 2012 4:11 am

Truck wrote:1. Would I need to make use of O rings? and if so would the rotation become difficult and less ergonomic?


Assuming the sleeve is a good tight fit, I would say o-rings are not necessary - you might lose a couple of fps but nothing you would notice without a chrony.
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Unread postAuthor: Truck » Thu Jan 05, 2012 4:15 am

Assuming the sleeve is a good tight fit, I would say o-rings are not necessary - you might lose a couple of fps but nothing you would notice without a chrony.


Lovley, I want to say thanks again JSR, you have been a massive help!! :)
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Unread postAuthor: Daltonultra » Sat Jan 07, 2012 1:03 am

If you are making a copper cannon, there are even ready-made sleeves available in the form of repair couplings. Any plumbing supply store should have them for all sizes of copper pipe, and some of the big-box hardware stores have them for 1/2" and 3/4".
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Unread postAuthor: Truck » Sat Jan 07, 2012 8:09 am

Daltonultra wrote:If you are making a copper cannon, there are even ready-made sleeves available in the form of repair couplings. Any plumbing supply store should have them for all sizes of copper pipe, and some of the big-box hardware stores have them for 1/2" and 3/4".


Oh thanks, is this applicable in Australia? Or would you not know? I had a look in my local hardware store and they have a lot of copper piping, and fittings. I ended up buying the 12.7mm copper pipe, so would the next size up be 19.05mm with around a 13mm interior diameter?

...and perhaps a loading system like this :)

The Diagram is pretty self explanatory... :twisted:
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 07, 2012 9:32 am

Truck wrote:...and perhaps a loading system like this :)


Add a cam system and you can make it pump action ;)
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