Well, not a 1919 but so many M2 50 cal BMG's I don't remember. I could probably still set the head spacing and timing on one in dark or blindfolded. That is due to getting to have it and multiple other guns disassembled in a big box and having to do that. Fun times back then.
This is the kind of stuff I used to draw on sticky notes while waiting for machines to finish at work. Making basic bolts by hand is easy but any real mechanism with nothing but a crappy drill press and a grinder good luck. Nothing is more disheartening than having the knowhow and skills to make something and no resources to do it.
It's not hard. I used to have vague instructional videos on my channel on building a modified version of the Swedish K. All the tooling you need, besides the welder, is a grinder, hand drill and bits, and a thin hobby file for the extractor claw. Solid bolts for 9mm though. Making that delay mech in the bolt by hand could possibly be a test of patience
Mark there is absolutely a market for delayed blowback in 10mm, I hope you are contemplating a production run and make it work, so I have a reason to own a Serbu! glad to see you got the video up finally. Congrats on figuring it and the patience needed to get the video edited!
As an old school machinist I never had the opportunity to learn/work with cnc or this cad. Thing ,lol but I can see all the machining steps and metal pressing steps needed to make this. Old school works just no computer other than the one God gave you.
I'm no machinist but get what your saying. Two things spring to mind, STEN made by a man in a garage sent to the Brit War Department. The Owen made by a teenager in a 1940s home garage and left to rust at the side of his house in a 🥔 sack 😂
The extrema pistol grip angle is for familiarity to a regular rifle stock that was in common use at the time. Always enjoy your show and tell and humor. Thanks.
The "momentum amplifier" term is probably equivalent to the original term of an "accelerator". In the FAMAS the part responsible for delaying the action is called an "accelerator lever"
Basically you chance force for distance. The case is pushed backward, you don't want it to move to fast, so you use a mechanism, that trades force for distance.
This lever will be very heavily stressed .. this is why the German ditched levers and went with rollers instead, because they can withstand much more force.
By point of reference on blowback bolt mass, Winchester used about 2 1/2 pounds on their straigh blowback model 1910. Ballistically, that's like a 10mm extra extra long so a bit hotter than modern 10mm but with the same bullet weight and basically the same case diameter. Even with that huge bolt mass, they have a stupidly high bolt velocity and eject brass into low earth orbit. Need crazy stiff magazine springs for the feed to keep up with the bolt or they jam horribly.
If you try to find information on such systems you don't want so search "delayed blowback" but "retarded blowback" instead, because a shift in meaning happed over time. For example you will find those systems in Chinn's "The Machine Gun Vol. IV Design Analysis of Automatic Firing Mechanism" on page 54, while delayed blowback can be found at page 42.
0:55 the Type 1 FG42‘s grip is angled so far because it puts your hand at the same angle as the grip on a Kar98K. That was actually a good idea since they would have been so used to that angle and it would‘ve been better for the soldiers issued the rifle.
That's such an odd concept because the gunner would be a specialist role like the submachine gunner would. You'd think they'd try to match it to say an MP40 grip instead
@ I believe the FG42 was originally meant to replace the Kar98K for Fallschirmjägers and eventually the entire Wehrmacht (Hitler loved the concept of the rifle) so I guess it kinda makes sense but what you said is probably why they switched the grip style for the second type.
I did a dynamic analysis to a rolled delay system a couple years ago using simulink. The way I understand this system is an inertia amplifier since the bolt carrier is forced to accelerate quicker (and has more mass). I think my theory is basically the same as yours since the force is the momentum differential. Great video Mark
+1 Wehrmacht muscle memory from Gew 98 and Karabiner 98k. The German personnel parachute systems tucked, the suspension lines joined into a single riser that attached to the harness near the center of the back, minimal contol or steering. no Fallschirmjaeger would be firing an FG42 during descent.
That handle design is deliberate, it means it can be fired from two positions, either shouldered like a normal rifle, OR also hanging lower on a shoulder strap, "fired from the hip" where the forearm is over the stock.
Changing doctrine and posture is REALLY HARD. Standing square to the target and presenting my plate coverage and tucking the elbow, holding the rifle up high almost off my collarbone takes thought. My muscle memory is still bladed stance elbow out 45 degrees. Changing my grip to a more vertical one has helped though.
Scuffed CoD WaW meta lookin ahh gun. I honestly love it, it looks like a ppsh and a greasegun squeezed out a welded baby. The angle on that grip makes me feel woozy. Also, 10mm lever delay? that thing is a train made of _recoil._ lolol.
WG was where I first got bitten by the bug. Those guys were instrumental in helping me build some .... things. Making this into a gas operated rifle would be a very interesting thing to do. Although, that lever delayed is a pretty cool idea.
The system can be also explained by the so called French formula. Its "bolt head mass" + ("bolt carrier mass" squared "mechanical translation" ) = virtual mass For the Famas it's 140g + ( 240g squared 3 ) equals 2300g Meaning that that the Famas's real total bolt mass is only 380g, but due to its mechanical translation of 1:3 (for every millimeter of bolt head travel there are 3 millimeters of bolt carrier travel) the virtual mass of the Famas's bolt equal 2,3 kilograms.
Mark most people don't fully understand the "art" of gun building, nicely stated. As a fellow gun nut and gun builder I totally get it. Also you touching on the subject of having a certain level of arrogance to do so is spot on!
Bloke on the Range has a video about roller delay ("Roller Locking vs Delay: BotR Addendum") where he describes roller delay as a "down gearing system", re: "momentum amplifier".
I think you should just finish this guys design with the accelerator lever. Put it in cad and make it a smooth arc if you decide thats what it needs. Ive used the cad programs for drafting and designing that had the added wieght charts for spans and stress ect ect. Would give you all relevant fastener sizes and so on. Used one similar for engine design. Im sure there is one just for specific forces dealt with in firearms design.
They'll just regulate ALL firearm parts. Your whole crowd loves to push the envelope and poke the bear. The bear does have claws. Especially in this day and age.
for measuring the ratios, if you don't want a jigged setup - flat plate against the bolt face that extends past it (can likely do with while it's on its side with a gauge block). Micrometer as the moving device (against plate and lugs), for every X distance you close the mic, measure the gap that opens.
Or a non- linear curve. That would be the electronics engineering term. Discontinuance is something I’ve never heard of. Math is base for science and electronics. I enjoy working with smart talented folks that have different approaches to solve the same problem. Troubleshooting with the skills and materials you have. We benefit from this stuff, there are vehicles that run off of electric, gasoline and diesel fuel all sharing the road at the same time and have unique benefits. Thankyou for sharing these items. Another problem is a future one is that of manufacturing production. That also has weight to design and features.
It’s cool. Idle hands are the devil’s workshop. The guys tinkering,thinking & working with what he’s got. & enjoys it. Theres nothing wrong with that. Like it.
Somewhere I read that the Browning Auto-5, long recoil action, had a "recoil accelerator" a word combo I had never heard before. :) It was a spur cammed with the bolt so when the bolt was going back releasing the barrel to go forward, the spur would kick the bolt back further to guarantee the action spring behind the bolt had enough compression to push it forward.
Me: "Hey those are solid, functional stick welds." Mark: "...TIG..." Me: "Awww fu...wait a minute, I need to go practice my TIG welds before somebody asks me to post a video of something I welded..."
Involute profile I think is what you'd want for the lever profile, just like a gear. That way the point of contact is always at the same radius from the pivot, and the pressure angle remains unchanged.
Can I send my wacky designs to Mark? 😂 I use CAD, probably not like a professional, but that’s the same story as my MiG welding! Thanks for uploading, I always enjoy these types of videos! You’re awesome Mark!
Mathematica is really cool program, i used it to plot forces on hydraulic cylinders on tractor frontloader. As you said you need to know math, trigonometry exactly to do it. Enjoyed video as usual, thanks for posting.
That is actually really cool for what it is. That grip actually looks CA legal the way it sits so far back lol doesn’t look like you can get the webbing of your hand under the receiver. Pretty interesting overall. Nice video.
Lever delayed done correctly would be interesting. Finding the shortcomings of the design then correcting that and make it work would be cool. Gas operated would be interesting too.
There are four main factors for the formula: 1. how long is the power leaver 2. how long is the working leaver 3. how steep is the surface the power leaver is pressed against 4. how steep is the surface the working leaver is pressed against Those 4 questions has so be answered for every millimeter of movement. You will find out, the the "valley", were the lever in rested in the weapons housing, is most important because is controls the leavers movement. As soon as the leaver leaves this valley and its contact angle reaches a flat 90° the leaver no longer rotates and the acceleration of the bolt carrier stops.
Wow great design for a homemade smg, looks cool, need some finishings and you have another fun model of resistance smg... Now i am wonder if i will making version inspired of that .. this design definitely looks cool y like it ! Thanks you Mark ... and the builder !
A wise man once said that if you build a better mousetrap, the world will surely beat a path to your door. That two piece bolt is quite a piece of engineering, I hope he has patented it. More good stuff sir 🇺🇸💪👍
First step would be to create a chart with measurements taken the following way. Fix the gun by its frame and stick a rod into the barrel a way were very fine adjustments could be made. I suggest something featuring a worm gear, like a second wise. Push the rod only 1 millimeter (or thousands of an inch) into the barrel. Then measure the distance the bolt carrier moved and the distance of the gap created between the bolt head and the carrier. Continue until this gap no longer increases in length. Then you can use the French formula, some one already posted, to know what exact "virtual" mass the bolt have at a specific moment. Those systems are nothing like simple blowback but with a rapidly changing in (virtual) mass. Spoiler This thing will most likely need a fluted chamber.
France, it's really not that bad compared with rifle ammo like .308 (30 to 80-90€ for 20) but still, I get the JHP from PPU/Partizan at 34€/50 and the FMJ from Sellier& Bellot at 38€/50. Honestly it's only 68 cts/bullet but still if you shoot regularly it can become expensive compared to 9x19 from like GECO whose JHP sells at 10€/20
As a non-math person I am totally lost but still find it fascinating. I use the Kentucky Ballistics Windage method. I also keep a thumb free just in case.
Lever delayed is such qn underused and cool system i would love to see you give that a go. It seems to me it has the potential to be as good as roller delayed blowvack but without a lot of the tolerance requirements
Yup,I'm watching it again, this time on YT.. I think the lever delayed action is cool ,but which would give you the best cyclic rate ? Lever delay ?Gas delay ,or blowback? Or does it really matter as long as it's accurate? It is a work of art. Keep it up . God Bless you and your loved ones
Cyclic rate is determined by a combination of many factors, and "best" is subjective based on how it is going to be used. If you want examples of very high rate of fire systems you could look at the AN-94 or G-11 rifles, or perhaps the M134a "minigun". Really the short answer to your second question is "No", and the long answer is "It depends..." followed by several pages of technical discussion.
I get the idea that lever delayed is grossly underutilized and underappreciated. It's finicky, but in its core incredibly simple and could lend itself to quite economical production. Roller delayed rifles are notorious for their soft recoiling compared to gas operated rifles. There aren't many samples for the lever delayed rifles besides the FAMAS, which happens to be incredibly stout I hear, but may have traded reliability for recoil. And I think you can fit a lever delayed action in a handgun. In a parallel universe the alien pistol would be lever delayed
Try the Luago approach; gas delayed blowback. On a larger platform like a pcc having some sort of active cooling is a little more reasonable. That way you can mitigate the overheating.
When you try to make a MAT 49 from memory and you're a few drinks in. Pretty neat though. Also, I believe the reason they had the weird grip angle on the first FG42 was because they wanted to maintain familiarity with the k98k, so the grip angle... kinda replicated the feel of holding a regular stock, I guess. Idk, I'm not German
I saw on the tv here in italy that during a raid of the police into some mafia hide they found a home made functioning full auto submachinegun very similar to this one. It was quite an interesting piece, technically speaking
Grand Power, has a similar strange design. Its horizontal over the bolt carrier as a part of the charging handle. One part attached with the bolt accelerates with the moment of inertia, (firing) then the second part which was effectively stationary in terms of relative speed gets snagged and dragged along as well, slowing down the initial mass that was thrust rearward. Pretty spiffy 👍
Seems like the highest peak in stress on that accelerator lever should be at fully closed just after firing, and then have fallen off a fair bit by the time it hits that bump, so a smooth roll-off in leverage would be nice but shouldn't be the failure point. Then again, I haven't run the finite element analysis on it so maybe I'm just dumb and wrong.
"if you have ever taken a 1919 apart."
No Mark, most of us have not had the pleasure.
lol yup
Well, not a 1919 but so many M2 50 cal BMG's I don't remember. I could probably still set the head spacing and timing on one in dark or blindfolded. That is due to getting to have it and multiple other guns disassembled in a big box and having to do that. Fun times back then.
I actually do have a 1919, and he’s right the bolt is almost exactly the same
@DB-yj3qc you forgot " not to get completely off topic BUT ... "
Some German soldiers had the pleasure during WWII. I dare say.
It's so wild that one person made that. It's giving me Luty flashbacks.
If Luty lived in rabid Kodiak bear country 😅 but brilliant design .
This is the kind of stuff I used to draw on sticky notes while waiting for machines to finish at work. Making basic bolts by hand is easy but any real mechanism with nothing but a crappy drill press and a grinder good luck. Nothing is more disheartening than having the knowhow and skills to make something and no resources to do it.
It's not hard. I used to have vague instructional videos on my channel on building a modified version of the Swedish K. All the tooling you need, besides the welder, is a grinder, hand drill and bits, and a thin hobby file for the extractor claw. Solid bolts for 9mm though. Making that delay mech in the bolt by hand could possibly be a test of patience
Luty vibes all over... Good man PHL
Dude frfr, the American luty
I vote for lever-delayed.
If you’re picking up the project for the novelty of the concept, follow through with bringing that concept to life.
I'm watching before you tube pulls it. They're ridiculous, thank you Mark 👍
Mark there is absolutely a market for delayed blowback in 10mm, I hope you are contemplating a production run and make it work, so I have a reason to own a Serbu! glad to see you got the video up finally. Congrats on figuring it and the patience needed to get the video edited!
I vote for tuning the lever-delay until it works.
As an old school machinist I never had the opportunity to learn/work with cnc
or this cad. Thing ,lol but I can see all the machining steps and metal pressing steps needed to make this. Old school works just no computer other than the one God gave you.
I'm no machinist but get what your saying. Two things spring to mind, STEN made by a man in a garage sent to the Brit War Department. The Owen made by a teenager in a 1940s home garage and left to rust at the side of his house in a 🥔 sack 😂
The extrema pistol grip angle is for familiarity to a regular rifle stock that was in common use at the time. Always enjoy your show and tell and humor. Thanks.
the modern version of that is the cali compliant grips that aren't allowed to have the thumb wrap around the grip.
The "momentum amplifier" term is probably equivalent to the original term of an "accelerator". In the FAMAS the part responsible for delaying the action is called an "accelerator lever"
Basically you chance force for distance. The case is pushed backward, you don't want it to move to fast, so you use a mechanism, that trades force for distance.
In French c'est le LAI : le" Levier Amplificateur d'Inertie = Inertia Amplificator lever 🤗🍾🍷🍷🥮🥮🥖🥖🥖🗼
Does this one use lever to actuate the other mass (rear part) of the bolt. Thus can be called a lever delayed gun
@@Louis7.62X39 yes, and to amplify inertia is the equivalent of acceleration in English and French
Downloaded immediately just in case youtube deletes video.
no ship
That pistol grip got that gangsta lean
A what now?
Circa 1943.
@@Pommezul It's got like a 10 degree angle I'm not sure why it is that way. But whatever amuses him more I guess.😅
Fg-42 lookin grip
I was just thinking of another G-word
"These aren't the worst welds I've ever seen..."
I wanted to hear the rest of that sentence.
This lever will be very heavily stressed .. this is why the German ditched levers and went with rollers instead, because they can withstand much more force.
By point of reference on blowback bolt mass, Winchester used about 2 1/2 pounds on their straigh blowback model 1910. Ballistically, that's like a 10mm extra extra long so a bit hotter than modern 10mm but with the same bullet weight and basically the same case diameter. Even with that huge bolt mass, they have a stupidly high bolt velocity and eject brass into low earth orbit. Need crazy stiff magazine springs for the feed to keep up with the bolt or they jam horribly.
Lever-delayed, man.
That FG42 grip angle absolutely makes it 🤌🏻
If you try to find information on such systems you don't want so search "delayed blowback" but "retarded blowback" instead, because a shift in meaning happed over time. For example you will find those systems in Chinn's "The Machine Gun Vol. IV Design Analysis of Automatic Firing Mechanism" on page 54, while delayed blowback can be found at page 42.
It's not retarded, it's trying its best. :(
That’s the nickname I gave to my wife
@@strikeforce5331 😂
0:55 the Type 1 FG42‘s grip is angled so far because it puts your hand at the same angle as the grip on a Kar98K. That was actually a good idea since they would have been so used to that angle and it would‘ve been better for the soldiers issued the rifle.
That's such an odd concept because the gunner would be a specialist role like the submachine gunner would. You'd think they'd try to match it to say an MP40 grip instead
@ I believe the FG42 was originally meant to replace the Kar98K for Fallschirmjägers and eventually the entire Wehrmacht (Hitler loved the concept of the rifle) so I guess it kinda makes sense but what you said is probably why they switched the grip style for the second type.
Also, and probably mostly to prevent it from getting tangled in a chute
@ It isn‘t that because otherwise they wouldn‘t have changed the grip to be more vertical for the second pattern.
I did a dynamic analysis to a rolled delay system a couple years ago using simulink. The way I understand this system is an inertia amplifier since the bolt carrier is forced to accelerate quicker (and has more mass). I think my theory is basically the same as yours since the force is the momentum differential. Great video Mark
1:02 The extreme angle on the FG-42 Typ B's grip was to reduce retraining of guys trained on the Kar98k.
+1 Wehrmacht muscle memory from Gew 98 and Karabiner 98k. The German personnel parachute systems tucked, the suspension lines joined into a single riser that attached to the harness near the center of the back, minimal contol or steering. no Fallschirmjaeger would be firing an FG42 during descent.
That handle design is deliberate, it means it can be fired from two positions, either shouldered like a normal rifle, OR also hanging lower on a shoulder strap, "fired from the hip" where the forearm is over the stock.
@@wizrom3046this is what I had heard, walking fire from the hip.
Changing doctrine and posture is REALLY HARD. Standing square to the target and presenting my plate coverage and tucking the elbow, holding the rifle up high almost off my collarbone takes thought. My muscle memory is still bladed stance elbow out 45 degrees. Changing my grip to a more vertical one has helped though.
@@adlerarmory8382
Especially since they used drop canisters for weapons and gear.
Scuffed CoD WaW meta lookin ahh gun. I honestly love it, it looks like a ppsh and a greasegun squeezed out a welded baby. The angle on that grip makes me feel woozy. Also, 10mm lever delay? that thing is a train made of _recoil._ lolol.
WG was where I first got bitten by the bug. Those guys were instrumental in helping me build some .... things. Making this into a gas operated rifle would be a very interesting thing to do. Although, that lever delayed is a pretty cool idea.
As mechanical advantage goes to infinity, deformation becomes significant leading to an over center mechanism. Hello Vise Grip action.
The system can be also explained by the so called French formula. Its "bolt head mass" + ("bolt carrier mass" squared "mechanical translation" ) = virtual mass
For the Famas it's 140g + ( 240g squared 3 ) equals 2300g
Meaning that that the Famas's real total bolt mass is only 380g, but due to its mechanical translation of 1:3 (for every millimeter of bolt head travel there are 3 millimeters of bolt carrier travel) the virtual mass of the Famas's bolt equal 2,3 kilograms.
Mark most people don't fully understand the "art" of gun building, nicely stated. As a fellow gun nut and gun builder I totally get it. Also you touching on the subject of having a certain level of arrogance to do so is spot on!
Bloke on the Range has a video about roller delay ("Roller Locking vs Delay: BotR Addendum") where he describes roller delay as a "down gearing system", re: "momentum amplifier".
First derivative of acceleration is generally called "jerk." It is especially important in camming actions as you say.
Straight up jorkin it? The peanits?
I love the full on homebuilt just like that one. Complete it and show it firing.
Apparently Barry reinvented the German Korobov TKB-454 rifle from 1947 or the Famas from 1978 :)))
I vote for the lever delay. Very unique and interesting.
When you have luv and enjoyment of something just about anything is possible!
Cool chunk of metal!
@10:10 Mark explaining that infinities are a sign your equations are _wrong._ 😂
there is some novelty and ingenuity in this 'lever delayed" blowback idea. very cool design.
Watching now cause UA-cam is ridiculous.
Thanks Mark!🎉😊❤
My vote is for lever delay
I think you should just finish this guys design with the accelerator lever. Put it in cad and make it a smooth arc if you decide thats what it needs.
Ive used the cad programs for drafting and designing that had the added wieght charts for spans and stress ect ect. Would give you all relevant fastener sizes and so on.
Used one similar for engine design.
Im sure there is one just for specific forces dealt with in firearms design.
Can't stop the signal!
They'll just regulate ALL firearm parts. Your whole crowd loves to push the envelope and poke the bear. The bear does have claws. Especially in this day and age.
for measuring the ratios, if you don't want a jigged setup - flat plate against the bolt face that extends past it (can likely do with while it's on its side with a gauge block). Micrometer as the moving device (against plate and lugs), for every X distance you close the mic, measure the gap that opens.
Or a non- linear curve. That would be the electronics engineering term. Discontinuance is something I’ve never heard of. Math is base for science and electronics. I enjoy working with smart talented folks that have different approaches to solve the same problem. Troubleshooting with the skills and materials you have. We benefit from this stuff, there are vehicles that run off of electric, gasoline and diesel fuel all sharing the road at the same time and have unique benefits. Thankyou for sharing these items. Another problem is a future one is that of manufacturing production. That also has weight to design and features.
Hi Mark, I always enjoy the relaxed nature of your show.
Much better than the last one for sure thank you for sharing this enjoyable and informative video with us six stars brother
I think what you wanted to say is that the second derivative of the curve goes to zero on the flat spot
It’s cool. Idle hands are the devil’s workshop. The guys tinkering,thinking & working with what he’s got. & enjoys it. Theres nothing wrong with that. Like it.
Somewhere I read that the Browning Auto-5, long recoil action, had a "recoil accelerator" a word combo I had never heard before. :) It was a spur cammed with the bolt so when the bolt was going back releasing the barrel to go forward, the spur would kick the bolt back further to guarantee the action spring behind the bolt had enough compression to push it forward.
With pcc's becoming popular surely there's a market for delayed blowback guns that don't cost HK money
Lever delayed would be so cool
I would like to see a better lever delayed system but you are the one doing the deeds so have fun and geter done.
Me: "Hey those are solid, functional stick welds."
Mark: "...TIG..."
Me: "Awww fu...wait a minute, I need to go practice my TIG welds before somebody asks me to post a video of something I welded..."
Don't need to be a chef to critique a burnt steak.
Why do my stick welds look better than my TIG welds😂
IMO my stick welds look beautiful though
Lever delayed blowback was a favourite of Paul Kiraly who designed guns for 🇭🇺
Involute profile I think is what you'd want for the lever profile, just like a gear. That way the point of contact is always at the same radius from the pivot, and the pressure angle remains unchanged.
Can I send my wacky designs to Mark? 😂 I use CAD, probably not like a professional, but that’s the same story as my MiG welding!
Thanks for uploading, I always enjoy these types of videos! You’re awesome Mark!
There is no art to that thing. It is only pure function.
Mathematica is really cool program, i used it to plot forces on hydraulic cylinders on tractor frontloader. As you said you need to know math, trigonometry exactly to do it. Enjoyed video as usual, thanks for posting.
That is actually really cool for what it is. That grip actually looks CA legal the way it sits so far back lol doesn’t look like you can get the webbing of your hand under the receiver. Pretty interesting overall. Nice video.
Lever delayed done correctly would be interesting.
Finding the shortcomings of the design then correcting that and make it work would be cool.
Gas operated would be interesting too.
Definitely need to do lever delayed
There are four main factors for the formula:
1. how long is the power leaver
2. how long is the working leaver
3. how steep is the surface the power leaver is pressed against
4. how steep is the surface the working leaver is pressed against
Those 4 questions has so be answered for every millimeter of movement. You will find out, the the "valley", were the lever in rested in the weapons housing, is most important because is controls the leavers movement. As soon as the leaver leaves this valley and its contact angle reaches a flat 90° the leaver no longer rotates and the acceleration of the bolt carrier stops.
Wow great design for a homemade smg, looks cool, need some finishings and you have another fun model of resistance smg...
Now i am wonder if i will making version inspired of that .. this design definitely looks cool y like it ! Thanks you Mark ... and the builder !
those are the kind of welds that if you saw them on a bbq pit, the meat would be delicious
😂 accurate. Got my feet wet in welding building my first pit
A wise man once said that if you build a better mousetrap, the world will surely beat a path to your door. That two piece bolt is quite a piece of engineering, I hope he has patented it. More good stuff sir 🇺🇸💪👍
First step would be to create a chart with measurements taken the following way. Fix the gun by its frame and stick a rod into the barrel a way were very fine adjustments could be made. I suggest something featuring a worm gear, like a second wise. Push the rod only 1 millimeter (or thousands of an inch) into the barrel. Then measure the distance the bolt carrier moved and the distance of the gap created between the bolt head and the carrier. Continue until this gap no longer increases in length. Then you can use the French formula, some one already posted, to know what exact "virtual" mass the bolt have at a specific moment. Those systems are nothing like simple blowback but with a rapidly changing in (virtual) mass.
Spoiler
This thing will most likely need a fluted chamber.
Thank you for your time.
I vote you go with your chat gpt idea to figure out the lever delay.
Gas blowbacks are a dime a dozen.
That's freaking cool ...love this kind of content Mark thanks
Grip angle is for shooting off the hip.
Pretty cool.
Some fancy words to describe a corner
I love this, been wanting to design a 10mm delayed blowback for years!
Wait, you're saying that someone else has surpassed my ineptitude for welding?
Quick go blind in one eye you can win this! :)
Please keep that genius delayed blow back design. If he changed the grip angle that reminds me of the german PSSH.
People aren't born to do something, they learn what they love in life.
I guess I'll be the guy.
First model FG-42's have a grip to replicate the grip angle of a K98
10 mm is by far my favourite caliber, not only because I'm European therefore metric lol. Only problem is the price
Where you from ? check in Germany, Czech Republic or Austria. Price are bonkers, really really low
10mm is so awesome!
France, it's really not that bad compared with rifle ammo like .308 (30 to 80-90€ for 20) but still, I get the JHP from PPU/Partizan at 34€/50 and the FMJ from Sellier& Bellot at 38€/50. Honestly it's only 68 cts/bullet but still if you shoot regularly it can become expensive compared to 9x19 from like GECO whose JHP sells at 10€/20
The only problem is the EU......
Bad news: it's 0.400 inches which is 10.2mm.
As a non-math person I am totally lost but still find it fascinating.
I use the Kentucky Ballistics Windage method. I also keep a thumb free just in case.
If anyone doesn’t get to finish it, I watched it on rumble.
Sadly no access to rumble from France 😞
Rumble beats the UA-cam bumble
I'm a big fan of delayed blowback, but whatever you end up doing, I'll watch!
Lever delayed is such qn underused and cool system i would love to see you give that a go. It seems to me it has the potential to be as good as roller delayed blowvack but without a lot of the tolerance requirements
That things hot hell yea. Aesthetics on this are just peak for me at least.
So, they guy who built it must have had a dream where an FG-42 and a Luty smg loved each other very much....pmsl!!
Lé Resistance needs this Barry guy.
The ghost of Pal Kiràly commands you to keep tinkering with lever delayed mechanism untill it verks
That thing is metal as hell!!
Never use the chat bots for maths, they can't count for shit.
Yup,I'm watching it again, this time on YT..
I think the lever delayed action is cool ,but which would give you the best cyclic rate ? Lever delay ?Gas delay ,or blowback? Or does it really matter as long as it's accurate?
It is a work of art.
Keep it up .
God Bless you and your loved ones
Cyclic rate is determined by a combination of many factors, and "best" is subjective based on how it is going to be used. If you want examples of very high rate of fire systems you could look at the AN-94 or G-11 rifles, or perhaps the M134a "minigun". Really the short answer to your second question is "No", and the long answer is "It depends..." followed by several pages of technical discussion.
I get the idea that lever delayed is grossly underutilized and underappreciated. It's finicky, but in its core incredibly simple and could lend itself to quite economical production.
Roller delayed rifles are notorious for their soft recoiling compared to gas operated rifles.
There aren't many samples for the lever delayed rifles besides the FAMAS, which happens to be incredibly stout I hear, but may have traded reliability for recoil.
And I think you can fit a lever delayed action in a handgun. In a parallel universe the alien pistol would be lever delayed
Try the Luago approach; gas delayed blowback. On a larger platform like a pcc having some sort of active cooling is a little more reasonable. That way you can mitigate the overheating.
Sound like a modern version of the Kiraly 39M
That looks like totally awesome that's what it looks like
bring back super shorty mark
When you try to make a MAT 49 from memory and you're a few drinks in. Pretty neat though. Also, I believe the reason they had the weird grip angle on the first FG42 was because they wanted to maintain familiarity with the k98k, so the grip angle... kinda replicated the feel of holding a regular stock, I guess. Idk, I'm not German
The reason the world look like that is because that's an oxyacetylene torch weld also known as Bravsing
Lever delayed! It would be harder to make work but mechanically elegant and interesting.
Would be very interested in seeing the bolt more closely
Im no engineer , but in construction they are the guys who mess stuff up .but gas assisted seems much easier
They are never happy with the KISS method. Just like social scientists and deconstructionists.
I saw on the tv here in italy that during a raid of the police into some mafia hide they found a home made functioning full auto submachinegun very similar to this one. It was quite an interesting piece, technically speaking
Gas operated pistol sounds incredibly interesting. That lever mechanism looks a little similar to the silencerco maxim 9 mechanism.
Grand Power, has a similar strange design. Its horizontal over the bolt carrier as a part of the charging handle. One part attached with the bolt accelerates with the moment of inertia, (firing) then the second part which was effectively stationary in terms of relative speed gets snagged and dragged along as well, slowing down the initial mass that was thrust rearward. Pretty spiffy 👍
Mark, love you but I don't think the Guild needs advertisement.
Seems like the highest peak in stress on that accelerator lever should be at fully closed just after firing, and then have fallen off a fair bit by the time it hits that bump, so a smooth roll-off in leverage would be nice but shouldn't be the failure point. Then again, I haven't run the finite element analysis on it so maybe I'm just dumb and wrong.
When you said "momentum multiplier" I thought to myself "Like an accelerator?"
Would be funny it you used a U Channel safety pence post for the barrel shroud and rudimentary sights but left the green coating on it.