One of the better slow motion rifle barrel vibration.........

D

Don

Guest
videos that I have seen, especially clip #3 that best demonstrates a rifle barrel coming out of gravitational droop which causes the most muzzle displacement before projectile exit, which can clearly be seen in these videos from time frames 15 seconds to 18 seconds when loop repeated.

I am pretty sure that these real world live fire barrel motions do not coincide with the barrel motions depicted in Varmint Al's FEA models, but then again the type of rifle, support, no scope, and other factors are different than Al's model inputs.

Still, probably the best video of a free floated single shot rifle barrel that comes closest to the motions of a free floated BR rifle...........Don



http://www.youtube.com/user/29426129#p/u/10/FaW_Hs0B79c




xkwtwo.jpg
 
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Thanks Don

This is terrific! An actual slow motion video of what happens from the time the rifle fires till bullet exit.

Glad to find this video agrees with the one in my mind. :)

Gene Beggs
 
Here's a direct link incase the original takes you to a sign-up page.
http://www.youtube.com/watch?v=FaW_Hs0B79c&feature=related
If this doesn’t get you there, just search for "ex-f1 barrel vibration"

Good video, but I am curious what everyone believes they are seeing here.
To me it looks like they’re demonstrating how the off-center front sight (under initial recoil) has the greatest influence on initial barrel flex, as should be expected. They also fired the air-rifle upside down to show how the muzzle rises with the offset weight below the bore line.
After the spring piston hits the end of the compression chamber it’s a forward recoil vibration fest, but we’d never see that with a rimfire.

I’m guessing one (or two) offset weights could be even more effective than the tuners of today, much lighter at least. But the odds of finding the correct weight(s) and clock position(s) could be a nightmare! :eek:
And you'd better have a very good level on that rest lol! :D

Wish we could see some high-speed video of rimfires firing.
The firing pin bounce video was very interesting!
"hammer s400"
http://www.youtube.com/watch?v=0Hwhu8NJZ1w&feature=channel
 
JJ-IA said:
Here's a direct link incase the original takes you to a sign-up page.
http://www.youtube.com/watch?v=FaW_Hs0B79c&feature=related
If this doesn’t get you there, just search for "ex-f1 barrel vibration"

Good video, but I am curious what everyone believes they are seeing here.
To me it looks like they’re demonstrating how the off-center front sight (under initial recoil) has the greatest influence on initial barrel flex, as should be expected. They also fired the air-rifle upside down to show how the muzzle rises with the offset weight below the bore line.
After the spring piston hits the end of the compression chamber it’s a forward recoil vibration fest, but we’d never see that with a rimfire.

I’m guessing one (or two) offset weights could be even more effective than the tuners of today, much lighter at least. But the odds of finding the correct weight(s) and clock position(s) could be a nightmare! :eek:
And you'd better have a very good level on that rest lol! :D
Click to expand...

I am in total agreement about the use of "offset weights" as the most effective method of reducing barrel off axis movement, and I also agree correct weight amount and positioning are the most difficult aspects of getting the proper offset to a symetric stable firing sequence motion.

I believe the best method for carrying out this "offset mass weight" tune is thru the use of a large 2.0" diameter "recoil lug" between barrel and receiver that could accept a "rare earth" or other high force magnetic attachment with variable weight capabilities for quick ease of weight change and positionning. Once the optimal position/weight was established, a more permanent weight could be epoxied/bolted into position.

The key, is getting the "offset mass weight" attachment as close to the rear area of the chamber base/bolt face lug area, as this is the critical movement initiation point for all firearms..............Don
 
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heres one of a air powered pellet rifle. a friend of mine has several of these. this one has a wieght(tuner maybe) on the end of the barrel. notice the fex isn't as bad. these rifles shoot at centerfire speeds. they aren't my cup of tea but as long as people are shooting i guess it doesn't matter if it is a hopped up pellet rifle or anything else. http://www.youtube.com/watch?v=fZ8vKXx9MkI
 
Don said:
I am in total agreement about the use of "offset weights" as the most effective method of reducing barrel off axis movement, and I also agree correct weight amount and positioning are the most difficult aspects of getting the proper offset to a symetric stable firing sequence motion.

I believe the best method for carrying out this "offset mass weight" tune is thru the use of a large 2.0" diameter "recoil lug" between barrel and receiver that could accept a "rare earth" or other high force magnetic attachment with variable weight capabilities for quick ease of weight change and positionning. Once the optimal position/weight was established, a more permanent weight could be epoxied/bolted into position.

The key, is getting the "offset mass weight" attachment as close to the rear area of the chamber base/bolt face lug area, as this is the critical movement initiation point for all firearms..............Don
Click to expand...

Sounds like it would make for some interesting testing(!), and make the winter seem a little shorter at least. After I get my Suhl stocked I’ll rig up a simple offset mid-barrel tuner and see what happens.
Thanks again for sharing the video!
Jim
 
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