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Mausingfield Toroidal Locking Lugs
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- Опубліковано 9 лис 2014
- Ted Karagias, President of American Rifle Company informs viewers about the locking lugs of the Mausingfield bolt action.
The Mausingfield bolt has two diametrically opposed locking lugs that do not need to be lapped, ever. This feature is so important that it warrants an explanation.
Inherent to virtually all other bolt guns is an interaction between the firing pin and the sear that forces the bolt out of alignment with the receiver causing the locking-lugs to disengage the receiver when the bolt is closed. Because the bearing surfaces of both the lugs and the receiver are flat, any misalignment between the bolt and receiver must necessarily separate these surfaces. The lugs ultimately come to bear against the receiver when the rifle is fired, but not without excessive movement of the bolt within the receiver. This movement is detrimental to accuracy and in order to prevent it, gunsmiths lap the locking lugs against the receiver to ensure that the two are contacting one another when the bolt is closed. Shortcomings in design make this laborious task necessary.
In stark contrast to its competitors, the bearing surfaces within the Mausingfield are designed to properly engage one another when the bolt is closed, regardless of the alignment between the bolt and the receiver. The bearing surfaces of the locking lugs are shaped as portions of a torus and bear against surfaces within the receiver that are shaped as portions of a sphere. Regardless of the alignment between the bolt and the receiver, the respective bearing surfaces maintain contact, in this case along arcs that bisect the bearing surfaces of the lugs. Under load, both bearing surfaces are uniformly and elastically flattened against one another, enabling proper load sharing between the lugs, thus increasing the load bearing capacity of the breech.
The contact between the Mausingfield locking lugs and receiver is, by design, insensitive to the alignment between the bolt and the receiver, thereby making lapping unnecessary.
My left ear was lapped smooth by the time this video was over
This is simply the best bolt action on the market. Incorporates all the desireable featurea of the Savage, Mauser and Remington with none of the drawbacks.
yup crappy remington 700 recoil lug and all
The reward pressure of the seer onto the striker is relieved before pressure is built in the chamber.
A lot of criticism here in the comments from individuals upset they’re not capable of understanding. I bet there’s a ton of concepts they’re not able to comprehend.
Good vid . Hard to explain on screen without white board . I thought the best locking system kept the bolt face 90 degrees to the barrel centre line . if the bolt is allowed to move this angle changes . Not a great problem on military rifles , yet on civi's that want to reload , if the bolt face was not at 90deg the fired brass head would indeed be off centre.
Hi Ted, thanks for explaining this piece of the action. Makes sense from one engineer to another, what you've said.
I'm wondering about another critical feature of your receiver design, do you have a means to control the axis of the barrels you use to keep them tightly coaxial and collinear when they are threaded and tightened together, not relying on thread engagement alone to achieve that connection? Thread design by nature is excellent to achieve clamping force, but rather poor to achieve concentricity between mating parts.
Thanks for the answer in advance!
Ted how do you ensure that the bolt face is square to the case head (Chamber) for accuracy or does it even matter? Is the bolt face square under the tension of being cocked or does it square up when the trigger is pulled and the bolt is free to move and square itself with the assistance of case expansion. I would think that the upward movement at the rear of the bolt while cocked can also be minimized by increasing the outside diameter at the tail-end of the bolt before the bolt handle. This would tighten the fit to the inside walls of the receiver and get you very close to being square.
I don't and it doesn't matter. This is proved by many super accurate rifles (1/4 MOA or better) built on Mausingfield actions.
While those rounded lugs my stay in contact at all times, what about the bolt face remaining square to the case head? To me it would seem that properly lapped conventional lugs would be better at keeping the bolt face concentric or am I missing something here?
If the back end of the bolt wasnt pushed up (fixed with cocking mechanism as he describes) then the bolt toroid(s) could theoretically self center given enough clearance at back. That would also be a tough thing w all the leverage of the bolt weight. Pretty sure this is why he made the new heads floating. 3:23 more properly demonstrated should be him moving the receiver around and keeping the bolt straight.
Also, that flushness would come with a slight shift off centerline, but I think the cartridge head would have enough play on face to deal w that, if it could slide.
👍👍👍👍👍
Very good idea with the self centering lugs and coned receiver. Will you be making a 3 lug system?
And WHY would they do that and completely eliminate the controlled feeding? Go buy an XBolt.
que los pasen en español
Wouldn’t the reduced contact area of the bolt risk setback?
Nope. Parts elastically deform and then rebound. Deflections are small and toroidal surface appears almost flat to the eye. This is analogous to how cylindrical roller bearings are designed to reduce or eliminate stress at both ends of the cylindrical rollers by disengaging the inner and outer races at the ends. Admittedly more important in cylindrical roller bearings than in bolt actions but anything worth doing may as well be done right, especially if it's easy to do.
@@AmericanRifleCompany I’m not an engineer, but it seems that this design has less contact/bearing surface to distribute the bolt thrust over than traditional two or three lug bolt designs. I think the result would be that it would reach the limit of elastic deformation sooner than conventional designs. It seems that could lead to bolt setback.
Whether this could occur within typical operating pressures limited by brass and primers I do not know. As I said, I’m not an engineer and could easily be speculating on a circumstance which is unlikely to occur.
P.S. Roller bearing, whether cylindrical or tapered, increase the bearing surface compared to typical ball bearing.
We can think or believe whatever we want, but there's no substitute for actually testing. Real test results often differ with expected results. That's why we test.
Ted
@@AmericanRifleCompany At what pressure level do the parts deform in a non-elastic level?
@@richardbriscoe8563 I am an engineer and I understand what you are thinking about. If the radius of the feature on the bolt and the action are identical than there would be a full contact surface the same as a normal lug. Of course they will never be exactly the same but that is where what American Rifle Company said about small deflections under pressure comes into play. If they are close to the same radius but have single line tangent contact when there is pressure if both surfaces should conform to a full contact and then spring back into original shape.
As another thinking point in a typical bolt with flat faced lugs there will also never be a full flat on flat surface contact. "flat" surfaces are not really flat. So the same compression effect takes place when firing. The only time you may have bolt setback from non-elastic deformation would be when the radius of the bolt and action are far enough apart that original tangent contact point is compressed beyond elastic. Hope that makes sense.
Not got a clue what you said but wish i could build guns for a living lol (Uk laws suck)
Organize a revolution. Such is the natural order of things.
American Rifle Company Revolutions will never work lol.
Dolphins blow torroidal bubbles, much can be learned from nature within superior design :)
USA was begun by folks that decided they'd rather die than go on living as subjects to a monarchical system. What's it worth to you?
Fast forward a few hundred years, now the USA is dealing once again with a bunch of monarchical tyrannical thugs who decided the best way to overthrow America's government was to infiltrate through their electoral process, as kinetic force from the outside would not be successful due to our Constitutional system. We Patriotic people are fixing to throw these insurrectionist thugs out of our system, set them to proper prosecution and sentencing and take this place back.
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Not explained properly
Great concept. Not a great explanation.
That... was a crock of crap That's not how stuff works on very close examination. Toroidal lugs buy you nothing at all.
I see your IQ test came back negative.
But a mechanical engineering education and a good decade experience buy you quite a lot, especially understanding of mechanical matters.
I bet that is a nice action, and I know that you are wanting to make a profit, but $1600??? Come on man, I will get me a $100 or less Mauser 98 action and true it up and go from there.