Two brass swivel guns....

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davec2

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I started these guns many years ago while I was still in the Navy. They have been sitting under my workbench since 1978. I have been hard over on finishing up some cannon projects that have been hanging fire for too many years now. These guns are about 24 inches long and are currently cast solid. I bored the passage for the trunnions sideways through the castings. The machined trunnions will be furnace brazed in place and then the guns will be bored and lined with steel liners. The trunnions re 1 1/2 inches in diameter where they pass through the gun and the gun bore for the liner will be 1 1/4 inches. The liners are DOM 1.25 " OD seamless tubing with a 0.125" wall and welded breach plugs. The final bore will be 1 inch.





Not sure what I'm going to do with two more cannons.....but they need to be shootable before I worry about that. :eek:
 

davec2

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Had a chance to work on these two brass swivel guns again today. I got the trunnion brazed in one one. Just waiting for more braze alloy to come in before I do the second one. The next step will be to drill out the bores and install the steel liners.

Surface preparation of the cross bore for the trunnion to remove any oxides:



Trunnion prepared for the installation of rings of braze alloy by lathe cutting grooves:



Braze alloy wire installed in one set of grooves:



Once the trunnion cross bore and trunnion were fluxed, I hammered the trunnion into place and set the barrel up on my modified* BBQ grill:



Took about an hour and a half to bring the barrel temperature up to the 550 F required to get the Hi Force 44 braze alloy to run:



* I cranked up the gas supply pressure to get more heat out of the grill than is required for cooking.... ;)
 

Rich44

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Very nice. Those trunnions are not going anywhere. Especially since you are using a liner. The 1 1/4 steel liner will you heat the barrel to 350 degrees and drop the liner in with a .003 interference fit. If so watch that it does not bounce. These are going to look really great when done, I like the profile.
 

davec2

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Rich44,

Yes, the 1.25 inch bore for the liner is smaller than the trunnion major diameter of 1.625, so the bore will not even separate the trunnion into two halves. I'll put the liners in with epoxy. If they ever need to be replaced they are much easier to get back out.
 

davec2

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I had a little time to work on these bronze cannon and cleaned up the trunnion braze joint on the first barrel.......



That process came out well enough that I set up the second barrel for brazing and got that done yesterday........



The long drills I need to bore these are on order and should be here shortly.
 
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