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Pneumatic wood-stock Rifle Build Log

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Pneumatic wood-stock Rifle Build Log

Unread postAuthor: VH_man » Wed Nov 25, 2009 6:15 pm

Well, I have embarked on another journey to yet another cannon, and because I now have a camera almost all to myself, I thought I would put this up here, seeing as I am spending lots of time waiting for my epoxy to dry.

Basically, I have found that my .177 Stick Gun has become one of my favorite Launchers. It is easy to fill, Easy to load, Easy to fire, and after firing through almost 5000 rounds has not even had a misfire.

I am basically constructing a new version of this cannon, but in a far more controlled matter. It is currently day 5 of my construction and you can see how far I have gotten. and now, "Where I am Now", A pictography:

Image
The Parts Layout (bad Picture... sorry)

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Barrel Support. This was constructed by moulding an epoxy "ring" and then chopping it down into two rounded sections, of which I then superglued back onto the barrelstock.

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Piston. Instead of a Direct Moulding, I like to decrease the friction inside the piston area by making my piston out of brass tubing filled with epoxy. The piston will be polished before final insertion as to decrease friction even more.

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Sealing Face. I have placed it inside the brass tubing to help protect against peeling due to the high velocity air blowing by it in the cannon. This piece of rubber is temporary, I am precision punching out a better piece that will fit perfectly in the tube.

From here, I have alot of work to do. I literally just poured the barrel end of the finalized cannon, and I am waiting for that to dry before I start my next set of experiments. My general Idea for this cannon is to end up looking as close to a muzzleloader as possible. I have a very nice piece of walnut that I am currently roughing out into a nice thumbhole stock, and I need some way of piloting and filling the cannon without removing it from the stock. I want the firing to be trigger-like, and the fill to preferably be at the very back of the cannon, in the form of a Schrader.

So basically, What would you all recommend for piloting this thing rifle-trigger style? And any suggestions on mounting the "cannon" to the stock firmly?
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Last edited by VH_man on Wed Nov 25, 2009 9:17 pm, edited 2 times in total.
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Unread postAuthor: dewey-1 » Wed Nov 25, 2009 6:26 pm

You may want to crop the picture to eliminate the name an age!

Looks good so far!
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Unread postAuthor: VH_man » Wed Nov 25, 2009 9:19 pm

dewey-1 wrote:You may want to crop the picture to eliminate the name an age!

Looks good so far!


Thanks for that... Haha. Didn't notice I was on top of my swim stats... :oops:
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Unread postAuthor: jamie e » Thu Nov 26, 2009 12:05 am

A strong way to mount the "cannon" to the stock is by soldering a some nuts to the underside of the cannon then drilling holes through the stock so you can put bolts through the underside of the stock and screw them into the cannon. This is very similar to the way my airsoft rifle is held together.

Clean and removable system.
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Re: Pneumatic wood-stock Rifle Build Log

Unread postAuthor: jackssmirkingrevenge » Thu Nov 26, 2009 12:51 am

VH_man wrote:I am spending lots of time waiting for my epoxy to dry.


Bienvenido a mi mundo ;)

So basically, What would you all recommend for piloting this thing rifle-trigger style? And any suggestions on mounting the "cannon" to the stock firmly?


I think jook13 had the right idea, in terms of piloting and mounting.

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Unread postAuthor: roboman » Thu Nov 26, 2009 1:05 am

@JSR:
¿Desde cuando habla Ud. español?
¿Está Ud. viviendo en españa?


@VH:
Actually, hose clamps can make an excellent temporary connection, at least, while you're testing the gun.
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ilovetoblowthingsup wrote: The yellow/orange back fits super snugly, very nice in fact, but the head does not fit.
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 26, 2009 1:14 am

roboman wrote:¿Desde cuando habla Ud. español?


Trabajo con una empresa española hace varios años, y como ellos no hablan ingles, tenia que aprender la idioma ;)
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Unread postAuthor: Mr.Sandman » Thu Nov 26, 2009 2:35 pm

jackssmirkingrevenge wrote:
roboman wrote:¿Desde cuando habla Ud. español?


Trabajo con una empresa española hace varios años, y como ellos no hablan ingles, tenia que aprender la idioma ;)


Creo que nadie presta atención a mi firma. Lo que sea, no necesito a todos ustedes. :lol: Btw vosotros is for coños! ha ha
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Yeah, it's that important.
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Unread postAuthor: Brian the brain » Thu Nov 26, 2009 3:22 pm

¿por qué estamos discutiendo este sentido no en español?

:?
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: rp181 » Thu Nov 26, 2009 4:34 pm

muy bien! espanol! mi es muy mal en la espanol.... ingles FTW!
BTB: por que no?
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Unread postAuthor: Mr.Sandman » Thu Nov 26, 2009 4:54 pm

rp181 wrote:muy bien! espanol! mi es muy mal en la espanol.... ingles FTW!
BTB: por que no?

Lol that sentence was horrible. It says my is bad in the spanish. You could have at least used a translator lol. anyways, any updates on the gun vh man?
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Yeah, it's that important.
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Unread postAuthor: VH_man » Thu Nov 26, 2009 5:50 pm

Well, I'm at my uncles house celebrating turkey day, so as of now I have no further developments. but I do have another question:

I attached the sealing face to my piston last night, and it doesn't seal 100% when I blow in the back of the cannon (a little bit of air leaks out of the barrel). Will this go away at higher pressures or should I re-mould my piston?

epoxy cured perfectly on the top piece. I discovered that clear spray-on plasti-dip will function perfectly as a method for stopping the discoloring of copper and add a very nice aspect of "rough" to the barrel part, which will end up having a nice effect.

As for attaching the "cannon" to the stock, I think I am going to hammer out some sort of brass "clamp" that I can bolt down in 4 places inconspicuously.
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Unread postAuthor: VH_man » Thu Nov 26, 2009 5:53 pm

Oops.... Please Delete....
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Last edited by VH_man on Thu Nov 26, 2009 6:21 pm, edited 1 time in total.
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Unread postAuthor: SpudBlaster15 » Thu Nov 26, 2009 6:08 pm

VH_man wrote:I attached the sealing face to my piston last night, and it doesn't seal 100% when I blow in the back of the cannon (a little bit of air leaks out of the barrel). Will this go away at higher pressures or should I re-mould my piston?


It should. IIRC lung pressure reaches a maximum of 3 - 5PSI, and in that range the net force on the piston is very low. Back in the day I experimented with several copper pipe launcher/cast piston designs, and none of them would completely seal with lung pressure. However, once the launcher was at operating pressure, the rubber sealing face would be pressed tightly against the barrel port, and the leaks would disappear.
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Unread postAuthor: rp181 » Thu Nov 26, 2009 7:32 pm

darn my high school spanish 2 class.... they dont teach us anything...
I made a EFFORT! :cry:

as for the gun, looks like a clean build...
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