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Blacksmithing is no longer a secret art and the techniques used are well-known. The square to octagon to etc. is a great way to turn a piece of bar stock into a round profile, but isn't the way a forge-welded barrel is made.Forge-welding a barrel:The purpose of the mandrel is to serve as a backer to the hammer blows and keeps the tube from collapsing. If a piece of flat stock is hammered into a swage block to make it U-shaped, the edges overlapped and forge-welded with the mandrel inserted, the end product is roughly cylindrical. After straightening as much as possible, the bore is then reamed so it is the same diameter from end-to-end. The octagonal shape must be intentionally created afterwards, serving to center the bore on the barrel profile which makes mounting sights and sighting-in easier (an off-center bore can cause problems). The barrel is likely straightened a few more times during the process.http://flintriflesmith.com/ToolsandTechniques/barrel_making.htmhttps://www.bing.com/videos/search?q=colonial+willamburg+rifle+making+youtube&&view=detail&mid=597530B0366DA2D5C602597530B0366DA2D5C602&&FORM=VDRVRVhttps://www.bing.com/videos/search?q=colonial+willamburg+rifle+making+youtube&&view=detail&mid=EA5EE46FC3C928830645EA5EE46FC3C928830645&&FORM=VDRVRVhttps://www.forgemag.com/articles/84439-gunmaking-forging-the-barrelhttp://toadhallrifleshop.com/barrel-forging/
Blacksmithing is no longer a secret art and the techniques used are well-known. The square to octagon to etc. is a great way to turn a piece of bar stock into a round profile, but isn't the way a forge-welded barrel is made.
Forge-welding a barrel:
The purpose of the mandrel is to serve as a backer to the hammer blows and keeps the tube from collapsing. If a piece of flat stock is hammered into a swage block to make it U-shaped, the edges overlapped and forge-welded with the mandrel inserted, the end product is roughly cylindrical. After straightening as much as possible, the bore is then reamed so it is the same diameter from end-to-end. The octagonal shape must be intentionally created afterwards, serving to center the bore on the barrel profile which makes mounting sights and sighting-in easier (an off-center bore can cause problems). The barrel is likely straightened a few more times during the process.
http://flintriflesmith.com/ToolsandTechniques/barrel_making.htm
https://www.bing.com/videos/search?q=colonial+willamburg+rifle+making+youtube&&view=detail&mid=597530B0366DA2D5C602597530B0366DA2D5C602&&FORM=VDRVRV
https://www.bing.com/videos/search?q=colonial+willamburg+rifle+making+youtube&&view=detail&mid=EA5EE46FC3C928830645EA5EE46FC3C928830645&&FORM=VDRVRV
https://www.forgemag.com/articles/84439-gunmaking-forging-the-barrel
http://toadhallrifleshop.com/barrel-forging/
