Oppo machines - Rifling a barrel

"6cyl" (6cyl) 08/04/2013 at 21:40 • Filed to: oppo machines, mechanics, guns

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Ever looks down the bore of a barrel and wonder how they got the lines perfectly parallel and at just the right curvature? This machine is at least how they used to do it. Brilliant use of basic mechanics.

vdub_nut: scooter snob > 6cyl 08/04/2013 at 21:48

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But... The rifling sticks OUT from the smooth barrel, this shows it being cut INTO the smooth barrel. A machine like this would start with a smaller internal diameter for the barrel, and cut everything BUT the rifling.

.30 caliber rifles fire bullets which are actually .303-.311 inches (depending on rifle and cartridge), the rifling cuts into them, which is why they spin.

archovist > vdub_nut: scooter snob 08/04/2013 at 21:58

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Dude, I think you're a little confused. The youtube vid is right - rifling is cut *into* the barrel. Check it: http://en.wikipedia.org/wiki/Rifling .

vdub_nut: scooter snob > archovist 08/04/2013 at 22:10

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I stand humiliated and corrected (about the rifling process). Most rifling pictures show it as an equal surface area at groove depth and land depth, thus the confusion.

Joe_Limon > 6cyl 08/04/2013 at 22:32

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That is cool. I used to operate a gun drill. I busted hundreds of dollars worth of drill bits due to lack of experience. You have to operate them by sense of sound, and to get the full life out of the drill you must properly sharpen them a dozen or more times.

Frank Grimes > 6cyl 08/05/2013 at 13:00

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Isn't rifling a american invention? A documentary I watched about Murica last night claimed as much. If so, Murica!