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Old 06-14-2012, 20:48   #1
RWBlue
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cylinder flutes

Why are (most) cylinders fluted?
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Old 06-14-2012, 23:37   #2
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To save weight.
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Old 06-15-2012, 14:28   #3
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With black powder the cylinder flutes help prevent the action from getting fouled up and jamming.
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Old 06-15-2012, 14:46   #4
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To reduce wight and prevent action foul.

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Old 06-16-2012, 16:02   #5
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Improved cooling during rapid fire!
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Old 06-17-2012, 21:24   #6
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Reduces air resistance.
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Old 06-17-2012, 21:40   #7
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Why are (most) cylinders fluted?
They tried "tromboned". It didn't work well

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Old 06-21-2012, 02:53   #8
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To save weight.
Pretty much the main reason these days
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Old 06-21-2012, 05:08   #9
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Quote:
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Why are (most) cylinders fluted?
Cylinder flutes,......intended to aid in turning the cylinder when loading.
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Old 04-24-2013, 01:18   #10
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Don't they also reduce mass alleviating wear on the notches and cylinder stop?
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Old 04-24-2013, 10:30   #11
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So when you over load the gun, the cylinder can self destruct in pre planned places.
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Old 04-24-2013, 10:32   #12
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I think they're fugly.
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Old 04-25-2013, 05:13   #13
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Quote:
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They tried "tromboned". It didn't work well

LOL!
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Old 04-25-2013, 14:39   #14
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Sometimes you can actually increase the strength of a metal part by removing excess material in places where it does not need to be. Removing the extra metal causes the stresses to flow through it differently, which in a well designed part, will eliminate stress concentrations in small areas, which in turn would cause the part to break.

Undercuts which are sometimes seen at the ends of rod bearing journals on a crankshaft are a good example. They make it look like the crankshaft would be weaker with less metal there, but they actually strengthen it by increasing the surface area in what would have been a sharp inside corner, where stress would have concentrated, allowing a crack to start, which then easily propagates like a crack through glass from there. On many aircraft cranks, they actually drill out the bearing journals hollow, not as much to make it lighter as for the fact that a forged steel crankshaft actually gets stronger when you do this, even though a cast iron automotive crank might get weaker.

I'm not sure if the same applies to gun cylinders or not because I've never seen it studied, but it's possible. It really all depends on the geometry of the specific metal part in question, and the exact way in which it flexes under it's normal stresses.
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Old 04-25-2013, 14:52   #15
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Quote:
Originally Posted by Brian Lee View Post
Sometimes you can actually increase the strength of a metal part by removing excess material in places where it does not need to be. Removing the extra metal causes the stresses to flow through it differently, which in a well designed part, will eliminate stress concentrations in small areas, which in turn would cause the part to break.

Undercuts which are sometimes seen at the ends of rod bearing journals on a crankshaft are a good example. They make it look like the crankshaft would be weaker with less metal there, but they actually strengthen it by increasing the surface area in what would have been a sharp inside corner, where stress would have concentrated, allowing a crack to start, which then easily propagates like a crack through glass from there. On many aircraft cranks, they actually drill out the bearing journals hollow, not as much to make it lighter as for the fact that a forged steel crankshaft actually gets stronger when you do this, even though a cast iron automotive crank might get weaker.

I'm not sure if the same applies to gun cylinders or not because I've never seen it studied, but it's possible. It really all depends on the geometry of the specific metal part in question, and the exact way in which it flexes under it's normal stresses.
We do that in knife making. Not leaving sharp corners at the blade/tang junction before tempering which would create "stress risers", sharpening the corners after.

A lighter cylinder also lowers the stress on the bolt/cylinder stop
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Old 04-25-2013, 15:17   #16
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Nobody would buy them if they were french horned.
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