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M107 project

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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M107 project

Unread postAuthor: Demon » Mon Apr 18, 2011 8:12 am

After finishing my 2meters wingspan rc airplane and not being able to fly it because of the goddamn wind, i am now stuck for two weeks in my other house, where my workshop is installed with all its machine tools ...
(Easter school break)

I have to make a M107 replica that fires caliber .545 marbles. I tought long about it and then i just found the perfect design.

As you can see in the diagram, its an inline Quick Dump Valve with a cartridge-bolt-action directly rattached to it, making the whole perfectly streamline to be fitted inside the M107 body.
Wether to use CPVC or copper for the air chamber is not yet decided, since I have problems drilling clean holes in copper.

My apologies for the poor image quality and lightning, they were taken by my laptop's webcam.
For the machining part, it won't be a problem, since i've managed much harder (i am even surprised by the extreme simplicity of this design. The biggest part of the work will go into making a realistic body).

Some insight, maybe ?
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Where i *maybe* got my inspiration.
It"s from patator.frbb.net
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Unread postAuthor: POLAND_SPUD » Mon Apr 18, 2011 8:40 am

Hmm I don't get it... so the main valve is the bolt??

If so then you might as well modify it into a valveless gun
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Unread postAuthor: Demon » Mon Apr 18, 2011 8:42 am

It's a QDV, as i've said, and the port is right over ther trigger.
I know my drawings are awful, but is just an idea.
The trigger pulls the wire wich make the pin at the end of the gun go back, releasing the compressed air into the bolt action assembly and the barrel.
Exactly how a basic QDV works.
The cartridge is only to hold the ammo and wadding to reload faster.
Got it ? Or not ?
Technician1002 would know i guess
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Unread postAuthor: Technician1002 » Mon Apr 18, 2011 8:57 am

Have you tried to zoom in on the small drawing? It needs to be higher resolution and cropped to the subject. I can't see the detail to understand were the chamber is, the valve, and the loading port. All text is illegible. I tried to zoom in to see the detail and just got blurr.
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Unread postAuthor: Demon » Mon Apr 18, 2011 9:01 am

I know.
Just imagine one of your QDV, but add a bolt action where the barrel connects to the air chamber.

The only reason of such a design is to make an inline valve.

If i still am not clear, tell me and I will go pick up the hd camera.
Edit: nvm i am going right now.
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Unread postAuthor: Demon » Mon Apr 18, 2011 9:20 am

Here it is.
Any easier to read ?

Anyway, you will see the real deal soon so drawings do not matter.
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Unread postAuthor: Technician1002 » Mon Apr 18, 2011 10:02 am

Much better. I can tell that thing in back is the Quick Disconnect. It uses a Cartrige for the projectile loading and it is not the QDV core. This is an exterior drawing so the valve core and ports in the chamber is not shown. Makes much more sense now.

I was trying to figure out how the internal parts not shown work.. :D
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Unread postAuthor: Demon » Mon Apr 18, 2011 10:09 am

Do has anything looking like that been already been made here on spudfiles ? If you have basic machine tools, it is very easy to build, and is inline, making it posssible to get it integrated inside an realistic body with no problem.

I really like it :) As simple as it is nice looking. The ideal design for me.

And yeah sorry for the confusion :?
Any problem that might arise ?
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Unread postAuthor: POLAND_SPUD » Mon Apr 18, 2011 2:04 pm

So is that what you mean ??
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Unread postAuthor: Demon » Mon Apr 18, 2011 2:48 pm

Here are the ready-to-machine plans.
And no Polandspud, it's a much simpler mechanism then the one you draw. you see the bit peeking out at the left of the gun ?
You pull it, and the valve opens, letting air into the barrel, wich is at the right.

The white ring behind the rubber seal does'nt block air, it's there to center the rod.

But it does'nt matter anyway, i am already ready to buy the missing parts.
Real machined aluminium should be easier to understand.

Are you at work or something ? You log in and out really fast :o
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Unread postAuthor: POLAND_SPUD » Mon Apr 18, 2011 3:15 pm

it's a much simpler mechanism then the one you draw
Is it ?? you'd just have to drill one hole and turn the bolt on a lathe (to cut o-ring groves)

Then just add a spring loaded bolt and a simple mechanical trigger... and voila! you've got a gun
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Unread postAuthor: Demon » Mon Apr 18, 2011 3:19 pm

Is it ??


It doesn't really suits my needs, since it's co-axial instead of inline. The barrel is cal .545, so making the airtank around it will making it even bigger, wich is not an option, as i want to integrate it in a stock.

Thanks even tough
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Unread postAuthor: POLAND_SPUD » Mon Apr 18, 2011 3:28 pm

yeah, the design I posted is a coaxial


but what stops you from turning that into a T with air chamber perpendicular to the barrel ?
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Unread postAuthor: Demon » Mon Apr 18, 2011 3:31 pm

I must make it fit in an M107 body, with nothing peeking out. So an inline streamlined design is the best (as the one posted earlier).
Well when i say with nothing peeking out, the Quick Disconnect fitting will, but it's reasonable. It even adds a touch to the gun.

Turning it into a T will (since i cant machine them) make the diameter bigger, and if the air chamber is perpendicular it wont be nice looking at all. And its not inline either.
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Unread postAuthor: FighterAce » Mon Apr 18, 2011 4:03 pm

You have to make it look like a M82? Sounds like somebody is expecting to see a homemade rifle. Are we by any chance of the same fate and have to make a barrett rifle for school?
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