spclark
Gold $$ Contributor
Don’t matter, watch that video you’ll see the drive band that engages rifling.
Naval gun rifling cutter photo's
- Thread starter Gun Smith
- Start date
jackieschmidt
Gold $$ Contributor
I have read where the big naval guns use a progressive, or gain twist.
As shells got heavier, due to the shear inertia to start the shell twisting, the twist had to gradual.
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Steel. But the rifling never engraves the steel. There are “rotating bands” usually of gilding metal swaged on to the base of the projectile. These don’t rotate, but they cause the projectile to rotate while in the bore. Here is a photo of the ready rack in a battleship turret. The brown band at the base is the rotating band,
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hogpatrol
Gold $$ Contributor
Begs the question, bronze or nylon?
OT/ Back in the bad old days, I ran an old WW2 surplus gun lathe. Used it to turn the bearing journals on steel mill rolls. The bed was 20' long, no rapid traverse, engaged the half nut to move it to the end or you'd be cranking that big wheel for a looong time. Man, I'm glad I don't have to do that anymore.
OT/ Back in the bad old days, I ran an old WW2 surplus gun lathe. Used it to turn the bearing journals on steel mill rolls. The bed was 20' long, no rapid traverse, engaged the half nut to move it to the end or you'd be cranking that big wheel for a looong time. Man, I'm glad I don't have to do that anymore.
USMCDOC
Silver $$ Contributor
jackieschmidt
Gold $$ Contributor
These Rifle Barrels were also designed to be “relined“ after so many rounds, which I believe were about 350 to 400.
dave@aDave
Gold $$ Contributor
These were actually quite interesting rifles. Projectile range was determined by barrel elevation and how many 110 lb silk bags were used. Maximum of 6 bags. One shot would pretty much use up my yearly allowance of powder
https://en.wikipedia.org/wiki/16"/50_caliber_Mark_7_gun
https://en.wikipedia.org/wiki/16"/50_caliber_Mark_7_gun
One of the more interesting threads and some good links. WH
snert
Silver $$ Contributor
Yes. If two sailors could pick it up, it passed. If it took three, they might need to tweak the load with an extra 110 pounds or so....
They actually fired a lot more than that. Reclining was a major process, as these were “built-up” guns with many tubes shrunk together to make the reinforcements necessary. The system that made up the tube assembly were liner, tube, jacket, three hoops, two locking rings, tube and liner locking ring, yoke ring and screw box liner. Some of these had interferences that would permanently deform the material to strengthen it call “autofrettage”. It was probably cheaper to just replace the whole tube.
I think only a relatively narrow brass drive band incorporated into the body takes much engraving.
joshb
Gold $$ Contributor
Large Magnum at least.
It's incredible to think of the precision of the machining of some of our largest machines.
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