Math, science, and barrel fluting

[Dusty Stevens]

Calfee may have not been able to show you on the chalk board how he could stop a muzzle but he pretty much invented tuning a rimfire barrel and on paper (target) it was proven a lot.

 

[mensajd]

Calfee may have not been able to show you on the chalk board how he could stop a muzzle but he pretty much invented tuning a rimfire barrel and on paper (target) it was proven a lot.

I haven't read Calfee, so I won't opine on his work. Adding mass to the distal end of a cantilevered beam will affect the resonant frequency of the barrel system. Moving the mass longitudinally will too. I don't think anyone is arguing that tuners don't work.

 

[M-61]

Damoncali's post reminded me of something I heard many years ago.

"When you are ready to learn, almost magically, a teacher appears."

 

[Dusty Stevens]

I haven't read Calfee, so I won't opine on his work. Adding mass to the distal end of a cantilevered beam will affect the resonant frequency of the barrel system. Moving the mass longitudinally will too. I don't think anyone is arguing that tuners don't work.

When he explains what he meant by a stopped muzzle you would see what he meant. His example is usually a car antenna. Hold it in a vise at one end, get it resonating and youll see at a point in from the end where it doesnt move as much as it does on each side of that point. What wasnt known at that point was if you put your muzzle there the pattern will repeat again.

 

[mensajd]

When he explains what he meant by a stopped muzzle you would see what he meant. His example is usually a car antenna. Hold it in a vise at one end, get it resonating and youll see at a point in from the end where it doesnt move as much as it does on each side of that point. What wasnt known at that point was if you put your muzzle there the pattern will repeat again.

Again, without reading Calfee, and looking only at the vertical displacement, the barrel stops only at the top and bottom of its displacement. You can get useful results without being able to explain them.

 

[dcali]

Calfee as best I can tell made tuners and figured out how to get them to shoot and seems like a pretty well respected guy. But his ideas about how they work and what is going on are really off base - to the point where if a shooter uses them as a guide, he’ll get lost for sure. The barrel simply doesn’t stop in the way he explains it no matter what you do with a tuner.

 

[Mark W]

Old barrels are less stiff.

That’s what she said.....

 

[CharlieNC]

Interestingly doing ladder tests on several barrels showed the vertical and horizontal point of impact correlate highly, suggesting the barrel was vibrating at 45 degrees vs purely vertically. Much to learn.

 

[dcali]

Interestingly doing ladder tests on several barrels showed the vertical and horizontal point of impact correlate highly, suggesting the barrel was vibrating at 45 degrees vs purely vertically. Much to learn.

I have done a ton of ladder testing since getting my shot marker. It makes it so easy. Still digging in at levels I hadn't before. Interesting stuff.

 

[Hohn]

Torque and angular displacement was calculated in "rifle accuracy facts." Upshot: it's not a thing you need to worry about.

 

[gunsandgunsmithing]

I'm not sure how we got here but Calfee's wrightings are near if not 100% just plain wrong on tuners. I'm not saying he can't build a gun that shoots but I am matter of factly stating that when it comes to tuners, his whole..everything is based on physical impossibilities. In other words, hogwash!

I've made the statement before and I will again..you don't have to understand a tuner to use a tuner. But there again, he is wrong, in that he touts some mythical "parallel node" and "stopped muzzle" that protects you from ever needing to move a tuner. Again, this is opposed to science and physics.

An antenna is a very poor example of what a bbl is doing and further, you want bullet exit to happen at what is technically called an anti-node..just the opposite of a node.

Also, I believe it was Winchester that had tuning screws in the stock, long before him. He might have been the first to add a mass at the end of the muzzle. If so, he deserves credit for that but the man has set back how tuners are used and our understanding of them for decades. Just the opposite of his claimed "advancing" of rimfire. He has led people so far off track it'll likely take decades to fix what he's done.
He dismisses Vaughn, Varmint Al, myself, Beggs and anyone else that has actually has proven him wrong on every single occasion with real science, vibration analysis, FEA analysis and testing. Calfee blows every bit of that off and claims it as art, not science...or some silly notion like that.

That's all I have to say. Now, back to the thread.

 

[jelenko]

I just read a little of one of his blogs/posts.
I stopped when he wanted to claim that the barrel was still moving some number of minutes after the last shot. Sigh.