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.236 cal pistol

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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.236 cal pistol

Unread postAuthor: Demon » Tue Feb 09, 2010 6:59 pm

My birthday is in a few months and i want to have done a nice airgun to show off and have fun with my friends ... so i decided to build a 6mm pistol !
I post it to get the viewpoint of the community and what could i improve/change .

The gun take 5 stroke to pump (6 for high power) one stroke is 40 psi gain and it operates on 200 psi (14 bar, hence the name). Here is its power:

480 fps with .28g
540 fps with .28g and barrel upgrade

With 6 pumps i can achieve :

480 fps with .43 and barrel upgrade :twisted:

My friend may want to buy me one also ... but a less powerfull one of course ...

So, what do you think?
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Unread postAuthor: Gippeto » Tue Feb 09, 2010 8:03 pm

I will say it's an awfully ambitious project for someone just starting out machining. But it looks like an idea, so have at it.

Now the challenge will be to stay focused on this one idea until it's completed.

Good luck with staying focused and bringing your project to completion. :)
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Unread postAuthor: velocity3x » Tue Feb 09, 2010 10:48 pm

Nice looking design. A lot of precision required. Do you own a machine shop or have access to one?
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Unread postAuthor: POLAND_SPUD » Tue Feb 09, 2010 10:58 pm

hmm I am not trying to discourage you but I guess you could buy a better one cheaper... lol I guess that was discouraging


hmmm what I am trying to say is - why don't you build something that can't be bought ?

@velocity
I think he just bought a mini lathe
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Unread postAuthor: Marffy » Wed Feb 10, 2010 12:11 am

thats a cool pistol design. if it were me i'd make it a rifle. but thats just me. the high FPS made me think SNIPER! i think it would be hard setting up perfect iron-sights for a gun. but a scope would be easy. Theres always the posibility of buying a pump pistol and putting a longer and different caliber barrel on it. to me this design looks like a crosman multi-pump pistol. i/ve wanted one of those because of the rifled barrel. does rifiling an airsoft barrel make it more accurate? i would think so. unless u have those crappy bbs that have an airbubble in them (.12g)
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Unread postAuthor: Patto » Wed Feb 10, 2010 1:41 am

good luck with it man, We all hope you succeed.

But like everyone else has said it's a lot of work and sometimes (depending on where you live) it's just easier to buy one :D

Good luck tho... :salute:
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Unread postAuthor: CpTn_lAw » Wed Feb 10, 2010 3:01 am

I did the same thing to my crosman 1377c. though with a 60 cm barrel, and at 20 strokes (i know i know the box only says 10 maximum), a 25g bb goes through a lot of paper!
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Unread postAuthor: inonickname » Wed Feb 10, 2010 3:24 am

Marffy wrote:thats a cool pistol design. if it were me i'd make it a rifle. but thats just me. the high FPS made me think SNIPER! i think it would be hard setting up perfect iron-sights for a gun. but a scope would be easy. Theres always the posibility of buying a pump pistol and putting a longer and different caliber barrel on it. to me this design looks like a crosman multi-pump pistol. i/ve wanted one of those because of the rifled barrel. does rifiling an airsoft barrel make it more accurate? i would think so. unless u have those crappy bbs that have an airbubble in them (.12g)


Rifling airsoft barrels isn't the most effective way of making them more accurate. For numerous reasons. A more effective method is to use a 'hop-up' (a detent) to create backspin on the projectile.

It's might ambitious. If you think you have the skills to make it, and the perseverance to match then go for it.

If i was going to suggest a change, I'd go for the hammer. I'd prefer a hammer (cylindrical) with a straight travel path. It can still be cocked by the cycling of the bolt.

And by the way, to the ones who go for "you could buy one for less"- that's hardly the point. When your into machining things into particular it doesn't matter if you could save time and buy it for less- you machine it for experience and sometimes the novelty. I'd prefer to use an item I made than one I bought.
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Unread postAuthor: Demon » Wed Feb 10, 2010 7:29 am

If i was going to suggest a change, I'd go for the hammer. I'd prefer a hammer (cylindrical) with a straight travel path. It can still be cocked by the cycling of the bolt.


I found that a rotating hammer was simpler as the hammer head valve wont have to be machined off-center, wich is not easy to do with a self centering chuck. And without that sort of hammer, the look changes, and not for the better (its not as nice as you cant recharge it with your thumb like a revolver)


That is some great encouragement ! Thank you a lot !

And for those who wonder why dont i buy one, its to showoff and as i am minor, i cant really buy one.

I give myself 3-4 months to complete it (before friend party)
And i will make a build log here .

EDIT:

@inonickthename

You are right, even tough i will attempt to make a rotating one as it looks better, it may not be powerfull enough to fully open the valve as the valve is close to the rotating point ...

I think i will make the valve a little higher compared to the middle of the valve for more displacement of the hammer ... :scratch: i will post schematic soon
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Unread postAuthor: Demon » Wed Feb 10, 2010 12:21 pm

This is the hammer valve, but note that it is not to scale.

The valve is a little higher then the middle
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Unread postAuthor: eriko1337 » Wed Feb 10, 2010 4:05 pm

i like the design it looks cool. by the way even if its cheaper to buy its much much more fun to build so go for it :)
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Unread postAuthor: Demon » Wed Feb 10, 2010 4:17 pm

Finally, i will go for inline hammer, but now less talk more work i am going to make cad all this afternoon .
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