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| The Arsenal Where firearms enthusiasts gather to discuss their passion for things that go bang. Political debate is one floor down and not welcome here. |
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#1
06-29-2017, 11:01 AM
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Rifling
I was watching a documentary on guns used in the navy and I wondered what the twist rate was on a big gun. I looked it up in Wiki and it is pretty interesting. It mentioned that tanks use a smooth bore so probably big guns on battleships are also. If anyone knows different let me know.
https://en.wikipedia.org/wiki/Rifling#Twist_rate
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 “We are all capable of believing things which we know to be untrue, and then, when we are finally proved wrong, impudently twisting the facts so as to show that we were right. Intellectually, it is possible to carry on this process for an indefinite time: the only check on it is that sooner or later a false belief bumps up against solid reality, usually on a battlefield.”—George Orwell, 1946 "The race may not always be to the swift nor the victory to the strong, but that's how you bet." - or - that's how the smart money bets...attributed to Damon Runyon 
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#2
06-29-2017, 11:16 AM
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Battleship "guns" are rifled.
Look up the weight of one 16 inch "caliber" gun barrel. Tank cannon barrels are rifled, you can see it at the "flash" end in most pictures, as in "Look Here, Smile wait for Flash"... Oh! Wait! Some googling on wiki got this tidbit... " " " "In the 1960s smoothbore tank guns were developed by the Soviet Union and later by the experimental US–FRG MBT-70 project. Based on their experience with the gun/missile system of the BMP-1, the Soviets produced the T-64B main battle tank, with an auto-loaded 2A46 125 mm smoothbore high-velocity tank gun, capable of firing APFSDS ammunition as well as ATGMs. Similar guns continue to be used in the latest Russian T-90, Ukrainian T-84, and Serbian M-84AS MBTs. The German company Rheinmetall developed a more conventional 120 mm smoothbore tank gun which can fire LAHAT missiles, adopted for the Leopard 2, and later the U.S. M1 Abrams. The chief advantages of smoothbore designs are their greater suitability for fin stabilised ammunition and their greatly reduced barrel wear compared with rifled designs. Much of the difference in operation between smoothbore and rifled guns shows in the type of secondary ammunition that they fire, with a smoothbore gun being ideal for firing HEAT rounds (although specially designed HEAT rounds can be fired from rifled guns) and rifling being necessary to fire HESH rounds. Most modern main battle tanks now mount a smoothbore gun. A notable exception are the tanks of the British Army which used the 120mm Royal Ordnance L11A5 rifled gun until the 1990s; it was then replaced it with the 120mm L30 rifled gun which remains in service. The Indian Arjun tank uses an Indian-developed 120mm rifled gun. " " "... Silly me... 
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Last edited by Fe Butte; 06-29-2017 at 11:25 AM.
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#3
06-29-2017, 12:14 PM
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I may be mistaken but, if memory serves, I once read that the big battle ship guns had rifled sleeves inserted into the smooth bored barrel. They had an issue, after so many rounds were fired, of the rifled sleeve starting to slip out the end of the barrel.
Milling one of the big barrels. 
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 Master of Contemplation Last edited by Ol Mike; 06-29-2017 at 12:23 PM.
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#4
06-29-2017, 02:16 PM
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Gives a whole new scope to cutting chips eh'?
Wonder what the RPM was on that lathe?
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