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Fully Machined Bolt Action Rifle Build Log

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Fully Machined Bolt Action Rifle Build Log

Unread postAuthor: Xerxys » Wed Jul 21, 2010 5:20 am

I'm moving forward slowly but steadily with this, but I've never really documented a build of anything before, so bare with me and my crappy photography.

This is still in a very early stage, only the valve body and the connection between the tank and it are even started.
I'm in for the long haul with this one.

Also, if anyone in the Uk wants some machining/to get rid of any old tooling done, I can offer my amateur services, just pm me.
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Attachments
IMG_0029.jpg
Always good to keep a tidy bench.
IMG_0030.jpg
Yay for Milling machines! Also, you can see the ends of some less interesting cannons
IMG_0032.jpg
A Rotary Table, for making round things.
IMG_0038.jpg
Tis connects the pressure vessel to the main body.
IMG_0040.jpg
These bolts hold it in place.
IMG_0042.jpg
The massive hole bored in the block of Ali runs the whole way through.
IMG_0033.jpg
Pressure vessel attached
Last edited by Xerxys on Wed Jul 21, 2010 8:17 am, edited 1 time in total.

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Unread postAuthor: urgle the danish cow » Wed Jul 21, 2010 7:19 am

hey nice job, where is the bolt in this bolt action rifle? nice job with the milling. not many people on spudfiles ever uses machine work on there guns
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Unread postAuthor: chinnerz » Wed Jul 21, 2010 7:24 am

Looking good so far.

you should add "Build Log" to the title, so every one knows what to expect.
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Unread postAuthor: deathbyDWV » Wed Jul 21, 2010 10:39 am

Looks good. Also same as above. What part is this exactly?
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Unread postAuthor: PVC Arsenal 17 » Wed Jul 21, 2010 12:17 pm

Wow I didn't know anything about rotary tables until I saw this post. That looks like an extremely useful accessory to a milling machine. Excellent work, and good for you having a setup like that. You make most of use jealous. :lol:
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Mafs and Problems

Unread postAuthor: Xerxys » Fri Jul 23, 2010 7:33 am

OK, so I've done some math.

I was planning a hammer valve, but unfortunately I just figured out that if the valve stem had a radius of 3mm, (Diam=6mm) then a pressure of 400psi (0.28123 kg/mm2) would exert 7.95kg.

To clarify; 0.2812 (3^2 pi) = ~8kg

8kg is too much force for as small a hammer as I had planned, I think, and a bigger one isn't an option.

The goal is to have a small repeating valve (one pull of the trigger does not discharge the whole tank, cock, fire again etc.)

To that aim I did some modeling of another possible valve design, but I am not sure how well I can make internal O-ring grooves. If anyone has had any experience making them, I'd really like to know how it went.

Has anyone made a valve like this before? Any comments and ideas are welcome, this is certainly not final.
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Attachments
DiagramValve.PNG
The new valve
DiagramValve2.PNG
Air at 400psi comes int through the small holes at the front. It fills the inside of the valve stem/bolt, the bit in the middle.
Valve Fired.PNG
The stem/bolt of the valve, filled with air is now pushed forward, closing the hole allowing air in, and opening the the hole to the valve.
Last edited by Xerxys on Fri Jul 23, 2010 9:01 am, edited 1 time in total.

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Unread postAuthor: chinnerz » Fri Jul 23, 2010 8:46 am

Make O-rings?? now theres an idea!
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Unread postAuthor: Xerxys » Fri Jul 23, 2010 9:01 am

O-ring grooves then, if you wanna get picky.
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Unread postAuthor: Gun Freak » Fri Jul 23, 2010 9:56 am

It's quite easy to make o-rings, there are tutorials on the web.
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Unread postAuthor: Xerxys » Fri Jul 23, 2010 11:05 am

I've had a quick look, but couldn't find much comprehensible advice.

Here's the part I think will cause me difficulty in terms of getting it to seal
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Pressure Shielfor wb.PNG
Will this sort of thing seal reliably?
Pressure Shielfor wb.PNG (21.47 KiB) Viewed 2139 times

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Unread postAuthor: velocity3x » Fri Jul 23, 2010 11:25 am

Xerxys wrote:I've had a quick look, but couldn't find much comprehensible advice.


Machinery's Handbook is where you'll find what you're looking for.
http://www.amazon.com/Machinerys-Handbo ... 0831127007
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Unread postAuthor: Xerxys » Fri Jul 23, 2010 2:32 pm

That's your side of the pond, but still, 83$ for a book? That's quite a bit.
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Unread postAuthor: Crna Legija » Sat Jul 24, 2010 12:09 am

cough cough click here cough cough :lol:
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Unread postAuthor: Gippeto » Sat Jul 24, 2010 1:03 am

No hobby/machine shop is complete without at least one copy of Machinery's Handbook.

Pure gold. :)

If you don't want to bore the o-ring grooves, you could machine sleeves that sandwhich the o-rings. I've seen more than one spool valve cunstructed in such a manner.

http://www.bruininstruments.ab.ca/PrintablePDF/G1F.pdf

See pg 18 Pilot assembly.
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Unread postAuthor: lozz08 » Sat Jul 24, 2010 4:03 am

with your ability to machine parts, you could go with a pneumatic ram powering a piston like in a spring airgun. if it is going to be bolt action, it may as well be spring powered
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