echo3mike
Member
What is this guy doing, and why is he doing it?
S.
S.
Tanker guys...What's this guy doing?
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BluesBear
member
"Calibrating" I believe, would be something akin to bore sighting or laser sighting the big gun.
RustyHammer
Member
A Bris? (circumcision) 
SLCDave
Member
No, you have it all wrong. He's installing the silencer!!!
BluesBear
member
No SLCDave, THIS is a silencer!
grnzbra
Member
It's a blank firing device so they can fire blanks in training exercises.
grnzbra
Member
No, BluesBear, your picture is a balistic fingerprinting device so that places like PRNJ can tell who ownes the gun when it is used in a drive by shooting.
Partially correct,
It is a boresight. It is used to recalibrate the sighting sysytem to the bore. Big gun barrels after firing develop " Droop" for lack of a better word. These barrels are heavy and when the main tank rounds are fired the barrels heat up. When they heat up the wieght of the barrel makes it droop ever so slightly. I don't remember right now how many rounds can be fired between recalibrations but my ancient memory recalls about 40-50. If it is not done the gun will consistanly shoot low. Actually a smart gunner will count his rounds and be calulating ( kentucky windage ) for around every 5-10 rounds fired. I know this sounds trivial but remember very typical ranges are 1500-2000 meters, and the droop gets really critical at those ranges.
It is a boresight. It is used to recalibrate the sighting sysytem to the bore. Big gun barrels after firing develop " Droop" for lack of a better word. These barrels are heavy and when the main tank rounds are fired the barrels heat up. When they heat up the wieght of the barrel makes it droop ever so slightly. I don't remember right now how many rounds can be fired between recalibrations but my ancient memory recalls about 40-50. If it is not done the gun will consistanly shoot low. Actually a smart gunner will count his rounds and be calulating ( kentucky windage ) for around every 5-10 rounds fired. I know this sounds trivial but remember very typical ranges are 1500-2000 meters, and the droop gets really critical at those ranges.
Fly320s
Member
He's trying to remove the patch that got stuck in the barrel.
RED-DOG 40
Member
Used to do this. It's a bore-scope. Little television camera like the ones the docs check your heart with. That one looks a bit different than the ones we had. They show cracks and any other deformaties. BTW "cracks very bad". Tube go KABOOM...
Checking for barrel alignment with a laser boresight.
The British take all the effort out of this by installing a reference mirror at the side of the muzzle. Check out a picture of a Challenger 1 or 2 and you'll see this little doohickey at the side of the muzzle that reflects a laser beam for alignment checking without having to dismount and plug the barrel with a boresight.
I assume that any deviations are dialled into the ballistic computer for automatic compensation during the firing sequence.
Newton
The British take all the effort out of this by installing a reference mirror at the side of the muzzle. Check out a picture of a Challenger 1 or 2 and you'll see this little doohickey at the side of the muzzle that reflects a laser beam for alignment checking without having to dismount and plug the barrel with a boresight.
I assume that any deviations are dialled into the ballistic computer for automatic compensation during the firing sequence.
Newton
Steelharp
Member
BluesBear... dood, what the heck IS that, really???
Mikey D...
Mikey D...
Benjamin
Member
That picture, IIRC, was taken in Germany, and it really is a muffler for artillery.
The_Antibubba
Member
Installing a choke, so they can fire the -5 gauge buckshot. It's more antipersonnel and less destructive to property.
BluesBear
member
We have a winner
Benjamin is correct.
Benjamin is correct.
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