Cliff Grays Podcast with Aaron Davidson

I think he’s referring to the standard “V angle” used for ISO spec threading. Joint meaning where barrel and action meet I’m assuming?

I know what threads and angles are:LOL: i'm just trying to understand the context of 60 degree threads and barrels not staying locked up with magnums. Is there a more appropriate angle to keep them locked up? Is 60 degree standard and gw uses something different? Or are we saying they just dont stay locked up at all?
 
Larger diameter cases are the biggest culprit. All of you hotrod hand loaders are also susceptible. If 65,000 psi, and larger case diameter, it pushes on a bolt with more force as case head area increases (simplification).
 
The dude is obviously very intelligent, but it doesn't take an ungodly amount of brain cells, or a $10,000 rig, to kill a big game animal. Gone from hunting to shooting. Ol granddad with his 30-06 and 4x Redfield was a hunting machine.
This is my problem with GW. They make excellent products, no doubt, but their entire marketing pitch removes hunting from hunting.
 
I heard him boasting other companies follow his lead on everything they produce. Do they?

I also heard him boast that his customers fly in private aircraft to come and buy his products. That’s nice. Don’t care about any of that really.

He also mentioned his customers are winners and take the biggest and best game out there. By spending how much money to achieve such accomplishments? Of course, if you have so much money you can’t spend it all in one lifetime, you can buy your way into a nice experience and trophy. I’m not opposed to rich people buying what they want. However, his marketing message there didn’t strike home with me…at all. Because that’s not the hunting I do.

Again, didn’t care for his message and condescending tone. So, I turned it off.
Why would a business owner even say that? How off putting!! I’m far more impressed by the hunter who drives his beat up 20 yr old truck to a public land trailhead, straps on a backpack and goes and kills big stuff with his bow or his uncle’s hand me down Model 70!
 
Here we go again..... Rokslide about 20-25 years behind the curve. A lot of this barrel action joint discussion and experimentation came about when a guy named Harold Vaughn wrote his book Rifle Accuracy Facts way back in 1998. It's available on the web in PDF for free. Find it, read the part about the barrel/action joint for some enlightenment as to what Aaron is talking about.

I'll add that back then there were tons of discussions about the whole deal on Benchrest Central and probably Accurate Shooter. Probably find a lot of that in a simple search.
 
On a serious note, thanks to you and Aaron for educating us on where to read more about this.
I was just funnin ya a little bit ;)
I imagine that has a lot to do with why certain smiths want bigger actions/tennons on Lapua bolt faces.
It has mostly to do with hoop strength with a cartridge that large in diameter. The smaller tenon/breech diameters do not leave much leeway safety wise during a pressure excursion. That said I don’t doubt that it may aid in joint stabilization.
 
I want everyone to pay attention to this.

Of all the threads, and arguments, and bickering on this forum of why bolted joints loosen (rings, pic rails, etc.) the below statement is about the simplest way to explain it and doesn't just apply to barrel and action, it's any stiff joint that is held together with the residual tensile loading of the fastener.

That basic statement gets you most of the way to understanding stiff bolted joints.

Throw in some joint relaxation (watch your D/L ratio as well as joint stiffness) and statically modeling of tensile bolt loading vs applied torque and you can start to see why bolted joints fail and why many interventions are band aids.



They don't stay locked up. The axial preload you can max without yielding is less than the force generated by the cartridge expansion on firing that is opposite the thread preload.

I imagine that has a lot to do with why certain smiths want bigger actions/tennons on Lapua bolt faces.

Chapter 6 it is:
View attachment 944422
 
Question I have is, if the joint is designed to rely on a preload, but it yields at less than the force generated by the cartridge…is it possible to design so the preload is greater? If not, why? Seems like a(nother) reason to avoid those cartridges.
 
I heard him boasting other companies follow his lead on everything they produce. Do they?

I also heard him boast that his customers fly in private aircraft to come and buy his products. That’s nice. Don’t care about any of that really.

He also mentioned his customers are winners and take the biggest and best game out there. By spending how much money to achieve such accomplishments? Of course, if you have so much money you can’t spend it all in one lifetime, you can buy your way into a nice experience and trophy. I’m not opposed to rich people buying what they want. However, his marketing message there didn’t strike home with me…at all. Because that’s not the hunting I do.

Again, didn’t care for his message and condescending tone. So, I turned it off.

Yes Aaron, you put yourself out there on the internet you are going to show your true colors. Especially when you are trying to convince people to buy what you are pushing.People will either follow you like sheep or challenge and hate you. The above quoted comments from Mr. Davidson triggered my response of Aaron resembling a Carnival Barker. I have found arrogance not to be a form of confidence but rather a form of insecurity and B.S..
 
Yes Aaron, you put yourself out there on the internet you are going to show your true colors. Especially when you are trying to convince people to buy what you are pushing.People will either follow you like sheep or challenge and hate you. The above quoted comments from Mr. Davidson triggered my response of Aaron resembling a Carnival Barker. I have found arrogance not to be a form of confidence but rather a form of insecurity and B.S..
Man I dont know if Aaron owes your wife child support or whats going on but he is living rent free in your head. If he did not wrong you in some way you may want to talk to somebody. Its weird to feel that strong about someone you dont know.
 
Finished the rokslide podcast w @Aaron Davidson . Dont fear, there were fewer “panty-wad bombs” in there to trigger folks. 😀
I thought it was pretty good, and there was a little more detail on the scope evals and scope testing in general. As I understood it gunwerks does not test for impacts at all, only for recoil-induced stress of various sorts, although their scope fared very well in the eval here recently. Aaron‘s feeling was that much of the problem is recoil induced, and talked about the OEM‘s standard test being 1000 foot pounds, while some of the bigger cartridges in a lighter rifle produced half again or double as much. They discussed bonding some of the parts into the scope, and how that can both help and hurt performance, depending on some variables. One thing I found interesting was that in the Cliff Gray podcast he talked about “identical” scopes from the same OEM testing differently as a reason to suspect a problem with the evaluation itself, while in this case he talked about changing specifications with the OEM, which resulted in a different eval result. I’ve worked with OEM manufacturers before and in my experience you can absolutely specify different tolerances or procedures even for an off the shelf option, so well I haven’t worked with this particular manufacturer I think in general having scopes made to the same general pattern by the same factory that test differently is actually very realistic. Aaron also acknowledged that impacts can be really rough on a scope in the cliff gray podcast. I know that, Aaron knows that, so maybe theres some sort of collab potential here to develop something that can evaluate various scopes ability to handle impacts as well, the only trick being funding the equipment and figuring out who does something like that… I really hope Ryan takes him up on the offer to go thru the scope testing, and it would be really interesting to hear the micro-specifics from an engineer in this field on what could be done to the rokslide eval to “tighten up” the eval or perhaps to provide some calibration to it, while keeping it approachable to an independent or to crowdsourcing it, which is critical to its usefulness. Ultimately, Aaron‘s motivation for testing, or any scope companies motivation for testing, is not to produce a standardized evaluation across the industry so much as it is to test or develop their own product. Obviously many companies do testing on competitor products, but I’m not aware of anyone that publishes this or makes it available in a format for consumers.So this consumer testing is really focused on a totally different goal than a scope manufacturer’s testing is. That’s the source of the friction I think, is that everybody talks about testing, but various entities within the industry have very different goals from it. As a consumer, I want standardized published results across the entire industry from all of the models that I’m considering. That would be a ton of wasted time and energy for gun works, which product assortment doesn’t include many of the scope footprints that I find critical in my own hunting, and publishing results from competitors could easily result in either animosity, or maybe even legal friction that simply isn’t helpful for them. But with a transparent, “open source” test that any engineer could reproduce with simple equipment…????
Probably wishful thinking, and certainly rambling. 😂
I listened to both. I liked both as well as others he’s on. I actually try to listen to all of Aaron’s podcasts because no matter what he’s clearly intelligent. I would way rather listen to someone who has made a living selling $20k packages or whatever they are then random people online. And people fail to see to be successful in business you have to know your market and how to sell to that market. Literally dot.com secrets. Aaron picked his niche and markets to that. Exactly what a business man should do to be successful. Never going to make everyone happy and his customers seem to be happy who actually buy so that’s a plus.
 
Question I have is, if the joint is designed to rely on a preload, but it yields at less than the force generated by the cartridge…is it possible to design so the preload is greater? If not, why? Seems like a(nother) reason to avoid those cartridges.
Yes, but you need to look at this in a couple ways:

-If you can't get enough residual tensile force to resist loads in service it's not designed appropriately; more fasteners, larger fasteners (assuming the D/L is still ok), stronger materials (that allow higher tq/clamp load), and sometimes finer threads if you just want more joint tension.

-If it's a statistical problem (X% percentage of sold units do not have enough clamp load to stay together in expected service loads), then you might be able to solve it with improved assembly techniques, part to part variability, material/coating changes (i.e. galling), avoiding a full redesign.


How does all this apply to the barrel to action joint? It's the same, but you are stuck with one "fastener". So you can make the parts bigger, change materials out to new ones that have a higher tensile strength, better assembly techniques, etc. to get more preload in them when they are assembled.
 
Man, one would think Aaron is the second coming of Dale Earnhardt, the way people get up in arms. Love him or hate him, no middle ground….
I recently read Walter Isaacson's bio of Steve Jobs, and one of the takeaways for me was that great innovation and a certain level of abrasiveness often go hand in hand. I think maybe some folks should think about this and manage their expectations a bit. I don't know Aaron Davidson at all, and he may be the nicest guy you'll ever meet, but I think the principle often holds true to some extent.

My personal economics probably means I'll never own any GW products, and I certainly run in different circles than his clientele, but innovation trickles down, so I'm glad they are doing interesting things with rifles and optics.
 
if the joint is designed to rely on a preload, but it yields at less than the force generated by the cartridge…is it possible to design so the preload is greater?
In short yes there are methods to improve the joint stability and ways other than just more preload. Read the chapter shown by Wind Gypsy in the book I mentioned. He explains the issue in detail and goes into some fixes for the issue. Many people including myself tried different thread forms and tapered threads. This was heavily discussed years ago on a website I mentioned. Stiller Firearms even started making his actions with tapered threads to address the issue. Jerry eventually quit that because too many people were not able understand the concept and couldn’t seem to be able to figure out how to fit the threads (wasn’t hard so who knows what their issues were) so he eventually went back to standard threading. I’ll add that Jerry Stiller is a licensed PE and was a wealth of knowledge when he dove into a problem and chose to share his thoughts and findings.
 
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