Internal thread for sure. Also I seem to recall that stress relieving is not the same as annealing. I think it amounts to heating up maybe 200 degrees and cooling to freezing or so but I could be wrong. Anealing means heating the breach up red hot and letting it cool slowly over several hours.
A threaded breach avoids all those problems.
The big question comes back to what bore diameter you intend to use and what you intend to shoot. Large cannons (as opposed to mortars) are pretty bulky things to transport and to store. The largest practical size is roughly 2 1/2" bore or the size of a soup tin. Be sure to measure the diameter of your favourite tin first before making the gun :>) 1/2 soup tin full of concrete makes a pretty good combination but with an overall length of 7 or 8 feet and 5 foot wheels, it takes up a lot of space. Something around 1 1/4" bore on a naval carriage would take a plastic film cannister filled with concrete would be a lot more practical. Film cannisters can be bought at the local plastic shop.
What some may not have realized is that the barrels of many cannons are made from seamless tubing with a wall thickness of roughly 1/2" then the diameter is built up using rope and the surface finished off with fiberglass body filler. Painted mat black and it is pretty hard to tell it is not solid iron.
cheers mooncoon
A threaded breach avoids all those problems.
The big question comes back to what bore diameter you intend to use and what you intend to shoot. Large cannons (as opposed to mortars) are pretty bulky things to transport and to store. The largest practical size is roughly 2 1/2" bore or the size of a soup tin. Be sure to measure the diameter of your favourite tin first before making the gun :>) 1/2 soup tin full of concrete makes a pretty good combination but with an overall length of 7 or 8 feet and 5 foot wheels, it takes up a lot of space. Something around 1 1/4" bore on a naval carriage would take a plastic film cannister filled with concrete would be a lot more practical. Film cannisters can be bought at the local plastic shop.
What some may not have realized is that the barrels of many cannons are made from seamless tubing with a wall thickness of roughly 1/2" then the diameter is built up using rope and the surface finished off with fiberglass body filler. Painted mat black and it is pretty hard to tell it is not solid iron.
cheers mooncoon
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