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So now. The trunnions are now in place. The receiver to barrel is a shrink fit, so i heated the receiver to 400 degrees F and checked the id until it read .005 over the barrel’s od. Picked it up by the trunnions and it slid onto the barrel and seated perfectly. The barrel was stepped and the receiver turned to match, so when fitted, locked into place.

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2 minutes ago, arkie said:

Frosty, that's an example of an interference fit we were "talking" about

Why are you naming me to point out the obvious? I know what an interference fit is, have since I was maybe 9 yo. Perhaps pointing the obvious out to folk who were uncertain would be more profitable, than to someone who's been explaining interference fit joinery since the internet went public?

Frosty The Lucky.

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Dear A:  Thanks for the info.  I suppose in the Puget Sound area you can find things like pieces of naval guns.  Much harder to do here where we are 1000 miles from blue water.  I've always wanted to build a rifled falconette from a 37mm or 40mm barrel.

I suppose that you know that in the late 19th century one of the ways to control recoil before hydraulics was to have friction pads on the sliding portion of the carriage which were tightened before firing and loosened to return the gun to battery.

It might be interesting to test your toy for penetration against wood or metal.

Do you have any information on the photo of the gun with the guy in the kepi?  I can't decide if it is a signalling gun, a boat howitzer, a landing gun or something else.  The carriage looks too heavy for a signalling gun.  Also, I can't tell if it is a breech loader or a muzzle loader.  It kind of looks like he is opening the breech.

"By hammer and hand all arts do stand."

 

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2 hours ago, George N. M. said:

Do you have any information on the photo of the gun with the guy in the kepi?  I

That cannon is in fact a US army breech loading mortar from 1900. 
  As for barrel availability, in the 1970s through to 1990s demiled artillery was an easy find at scrapyards near military bases and army surplus stores. Mostly obsolete AA barrels in 40mm, but other stuff too. All mostly ww2 and Korean war scrap. I had a eight foot long section of 3 inch ordnance rifle barrel that i was making into a full scale civil war Whitworth gun. I traded an old Springfield 03-A3 for it. These days, i see 20mm vulcan barrels and not much else. Its mostly because missiles and rockets have replaced most artillery.

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6 hours ago, Frosty said:

Yeah, sorry. I've had a cookie since replying and it wasn't an issue at all. Darn blood sugar and time limit on edits. <sigh> I humbly withdraw my response.

Frosty The Lucky.

Hey, no harm done.  I went back and re-read my original comment and it did sound like I was telling YOU how it worked...not at all my intent.  I often have problems expressing my real intent...senior moment is my bailout.  As for me, I'm about to dig into some banana cream pudding with sliced bananas........

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Thomas:  That looks like the breech and a barrel section of either a 16 or 14 inch naval rifle (based on the water bottle for scale).  I suspect that it was used for high velocity testing of some sort at either White Sands or NMSM.  Is there still rifling in the barrel section?  IIRC some of the guns were bored out to smooth bore for some tests.

"By hammer and hand all arts do stand."

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