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| Xerxys |
 Posted: 07/21/2010 4:20 AM Post subject: Fully Machined Bolt Action Rifle Build Log |
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Private First Class
Joined: 18 May 2008
Posts: 39
103.33 Spud Bux
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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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| Always good to keep a tidy bench. |
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| Yay for Milling machines! Also, you can see the ends of some less interesting cannons |
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| A Rotary Table, for making round things. |
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| Tis connects the pressure vessel to the main body. |
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| These bolts hold it in place. |
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| The massive hole bored in the block of Ali runs the whole way through. |
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Last edited by Xerxys on 07/21/2010 7:17 AM; edited 1 time in total |
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| urgle the danish cow |
| Posted: 07/21/2010 6:19 AM Post subject: |
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Master Sergeant
Joined: 26 Jul 2009
Posts: 161
328.00 Spud Bux
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| 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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| chinnerz |
| Posted: 07/21/2010 6:24 AM Post subject: |
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Lieutenant Colonel
Joined: 28 Dec 2009
Posts: 469
748.06 Spud Bux
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Looking good so far.
you should add "Build Log" to the title, so every one knows what to expect.
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| deathbyDWV |
| Posted: 07/21/2010 9:39 AM Post subject: |
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Colonel
Joined: 16 May 2009
Posts: 577
813.12 Spud Bux
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| Looks good. Also same as above. What part is this exactly?
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| PVC Arsenal 17 |
| Posted: 07/21/2010 11:17 AM Post subject: |
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WITTY PHRASE
Joined: 27 Mar 2006
Posts: 1658
2023.77 Spud Bux
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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. 
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| Xerxys |
| Posted: 07/23/2010 6:33 AM Post subject: Mafs and Problems |
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Private First Class
Joined: 18 May 2008
Posts: 39
103.33 Spud Bux
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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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| 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. |
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| 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. |
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Last edited by Xerxys on 07/23/2010 8:01 AM; edited 1 time in total |
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| chinnerz |
| Posted: 07/23/2010 7:46 AM Post subject: |
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Lieutenant Colonel
Joined: 28 Dec 2009
Posts: 469
748.06 Spud Bux
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| Make O-rings?? now theres an idea!
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| Xerxys |
| Posted: 07/23/2010 8:01 AM Post subject: |
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Private First Class
Joined: 18 May 2008
Posts: 39
103.33 Spud Bux
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| O-ring grooves then, if you wanna get picky.
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| Gun Freak |
| Posted: 07/23/2010 8:56 AM Post subject: |
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The Anti Hybrid
Joined: 25 Jan 2010
Posts: 4210
333.21 Spud Bux
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| It's quite easy to make o-rings, there are tutorials on the web.
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| Xerxys |
| Posted: 07/23/2010 10:05 AM Post subject: |
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Private First Class
Joined: 18 May 2008
Posts: 39
103.33 Spud Bux
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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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| Will this sort of thing seal reliably? |
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| velocity3x |
| Posted: 07/23/2010 10:25 AM Post subject: |
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Colonel
Joined: 05 Jun 2009
Posts: 623
862.00 Spud Bux
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| Xerxys |
| Posted: 07/23/2010 13:32 PM Post subject: |
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Private First Class
Joined: 18 May 2008
Posts: 39
103.33 Spud Bux
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| That's your side of the pond, but still, 83$ for a book? That's quite a bit.
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| Crna Legija |
| Posted: 07/23/2010 23:09 PM Post subject: |
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shots shots shots
Joined: 20 Jul 2008
Posts: 1915
1664.80 Spud Bux
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| Gippeto |
| Posted: 07/24/2010 0:03 AM Post subject: |
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Donating Member
Joined: 19 Jan 2008
Posts: 1883
4673.49 Spud Bux
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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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| lozz08 |
| Posted: 07/24/2010 3:03 AM Post subject: |
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2nd Lieutenant
Joined: 01 Jul 2009
Posts: 238
696.68 Spud Bux
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| 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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