Heavy Gun?

[papapaul]

I didn't want to hijack the thread about the heavy gun sleeve so I'll start a new one. This thing is going to be on wheels. Somebody gave me a demilled 50 BMG barrel several years ago and I've been trying to think of something to make with it. This is about half done. I still have to devise a striker/cocking pirce/lanyard arrangement to go onto the bolt. The bolt rotates in the carrier at the same pitch as the interuppted threads. the carried travels by toggle and this provides initial extraction and insertion. My goal is to have a 1/2 size representative of a type of antitank gun common at the start of WWII. Not a replica. So I can have as many levers and wheels as possible. The lever in the picture is just for now, as is the pipe extension out the back. I alwasys wanted a stationary gun could traverse and elevate by cranking. I may make a barrel adapter to allow me to also fire 7x57 or something. Photo thing is stuck I'll post them ASAP.

 

[papapaul]

Whenever I put pictures onto the computer from the camera I have to cold boot before I can post. I keep forgetting that. I don;t know why, its magic. Now with my new internet explorer update, I also have to remember to hold down the control key to get the "manage Attachments" to come up.

 

[papapaul]

nuther pic.

 

[papapaul]

and another.

 

[papapaul]

and and another.

 

[papapaul]

Do you know if you say the same thing in two posts running like "another picture' the server won't let you post it?

 

[K Battenbough]

Nice!!!!! do you have any close-up pics of the bolt and lockup area? you pics would also relate to this thread that has recently been discussed:-
http://benchrest.com/forums/showthread.php?t=59441

KB

 

[papapaul]

This is a little closer.

 

[papapaul]

I took some better pictures

 

[papapaul]

Again

 

[papapaul]

And one more

 

[K Battenbough]

Looking good, thanks papapaul.

 

[papapaul]

This baby isn't barking yet, but she snaps. I got the firing group mocked up. One thing about prototyping: sometimes you make things big enough to accomodate the next step even when you're not sure what that is going to be. When you have it working you look at it and see that you didn't even need that cut, or whatever. If it is a problem, you just make the part over without the cut.

 

[papapaul]

I designed and installed a safety. This will not allow the bolt to be cocked when out of battery, that is, when the interupted threads are not engaged. There is a half cock position, now, on the striker which must be engaged in order to open the bolt. Bolt shown in travelling position with safety on. Also, I arrived at the final design of the toggle handle and put on a cocking knob.

 

[papapaul]

Mocked up the pintle mount on what will be the base of the carriage, as in the last picture of an American Armament 37mm. Say, what BR class will this be in?

 

[Mike Bryant]

Paul, are you going to have it done in time to shoot at the unlimited match in Seymour? It's a good thing their benches are set in concrete as it might pull a benchtop over.

 

[papapaul]

I'm going to put a fake recoil tube on top of it which will be, if fact, a rail gun. By screwing off a rear cap and screwing on an action it will fire, say, 7x57mm mauser.

 

[papapaul]

Well, i made the fake recoil tube. It is 1-3/4" od. Looks better to scale in person than in the photos, But making the tube and encaps is pretty easy, now that I can see what i have to work with i can maybe go as big as 2-1/2". It looks like a recoil tube though, not like a 7x57 mauser madsen MG barrel which it is. I can just screw on an action and shoot it right now. So, it'll have a brass cap screwed on normally and will look like the recoil device, then there will be an action in the toolbox. No problem with clearance screwing the action on. The extra material on the 2x2 piece of cold rolled will become the sight mount. I'll take a bunch off the underside to get it to look issue. This accessory will be sort of like a rail gun. the barrel is in tension from the tube.

 

[papapaul]

I welded up the base this morning and mocked it up in order to design the trails.

 

[Rad Mrdal]

Looking good, thanks papapaul.

Pal, you brainless ape. Why???? It must have something to do with papas or grandpapas,,,, Butch alike. What's next? Rad