Great demos like this are seldom seen nowadays but it is a must for hobbyist to know this old method. You can build a decent airgun following the procedure - many thanks "face off". Back in the 80's, we did it in a much harder way, using pin locks slightly off-center as we lack the taps for the thread. We have to find exact fits for the solid round bars, pipes, etc. and use files/sandpaper to form the parts. We use hand drills and bits as well. For major joints, we use brass brazing and minor joining using lead for the rest. We sure lack equipment back in the day. Thanks to this video, ready-made hardware parts made life easier. But I warn the DIY people in making this exact plan when handling high air pressure, especially above 2000 psi. Be sure you know and understand the allowable maximum pressure (pressure rating) of your metal fittings, parts and joints. Some well known brands of pcp air rifles exploded below its warranty. Be sure you know what you are doing before you are confident to reach 3500 psi.
S=(π•D to power of 2)/4 ~ 3•9/4 = 6.75 cm2 3500 psi~200bar Bar= kg/cm2 200bar=200kg/cm2 200•6.75=1350 kg That's over a ton of force that is pushing those endcaps off. If it will fly off it will kill someone. I don't think that those screws can whistand 350kg of shear force. It's really dangerous.
and the end caps should be heated after they are inserted into the tank before welding to ensure very good tank strength.. but goo design and concept just please mention in your discription the highest psi that this would be safe to use at. LOVE IT!!
Warning for viewers: it’s a bomb 3 times over. 1) 1mm wall thickness is far to little. 2) the end caps receive a huge load which is bound to shear off the pins securing them. 3) the threading was done wrong. Look up the required drill diameters, use them, and also use a drill press or lathe for good alignment, better roundness and cilindricity.
It is absolutely not safe. I fear that "face off" has not posted on his channel for a year because he had a face-off accident. This design is risky even for 350 psi.
Nice concept and end result.... but if this pipe is OD=32mm T=1mm (0.039") Its bursting pressure is only 1872psi (working pressure 1248psi) So.. if you really but into thiskind pipe 3500psi, its miracle if its not blowing up very deathly! Im working in this field, so Im NOT telling you bllsht :D
My thoughts exactly, plus the ends are only held by tiny screws as opposed to being threaded. 3500psi is way too much. Best case scenario is, the ends would shoot out onto your face. Worst case scenario, the pipe blows up along the seams (if it is not seamless), straight onto your face, hands and body.
@@amirazahari9366 Look up hoop stress and Barlows formula. Most folks building pcp's use a MINIMUM safety factor of 3x the maximum working pressure. I use and encourage you to use yield strength for all calculations rather than tensile strength.
Yeah, I don't see this holding a lot of pressure, best use hydrolic tubing and threading the ends. Always overshoot the pressure rating by using tubing that is rated much much higher.
according to @MrAntza 1 year ago Nice concept and end result.... but if this pipe is OD=32mm T=1mm (0.039") Its bursting pressure is only 1872psi (working pressure 1248psi) So.. if you really but into thiskind pipe 3500psi, its miracle if its not blowing up very deathly!
I think the end caps will actually fail before the pipe does, from my own calculations the pipe will begin to fail around 1900psi but will actually rupture at closer to 3900psi, by that point the pipe has swelled up. Long before that happens the end caps will have shot out like bullets and turned this guys head into mush. I can't find where he specifies what type and size of bolts he used but they sure as hell don't look thick enough to withstand anything close to 3500psi, if i had to guess i'd say they will eventually fail from fatigue at some point in which case it could be 1000psi or 2500psi, its a gamble when it will actually fail but judging by the fact that he hasn't uploaded in a year I'm not exactly hopeful.
I am late to the game on this video and don't want to add to the pile-on about the safety issues. The demo and methods of what you can do without an expensive bunch of equipment is always to be commended, and I admire that. Making do with what you have is a lost art, so kudos to face off for his creativity. But with that said, and not knowing what specific stainless steel alloy and temper he is using, I am skeptical of the safety at 3,500 psi. All stainless steels are not equivalent and some of them are surprisingly weak compared to the more common carbon steels and to most alloy steels. If we assume that this is type 316 stainless, I calculate that the tube, and the end-bolting method are good for about 1,500 psi, with a safety margin of about 2.6 to 1 for the yield strength of the tube (for bursting), but only a safety factor of about 1.7 to 1 for the ends of the tube distorting in the areas of the 4 drilled holes. I have done a lot of air tube tests to failure on my channel and there are many different failure modes, not just the tube blowing up. If you are lucky, an o-ring will leak or pop first, and some airgun designs are actually made with excessive o-ring clearances such that an o-ring will leak before a catastrophic failure occurs, if the tube is inadvertently filled above its safe maximum. For this design to be safe at 3,500 psi, with a minimum safety factor of 2.3 to 1, I would suggest a 2mm wall thickness of the 316 stainless tube of 32mm O.D., and also using 6 screws instead of 4. That is based on calculations for 5 different failure modes, and backed up by destructive testing that I have performed to validate several of the generic failure modes. Please be safe, and if you are in doubt, don't do it until you are sure about the safety.
THIS…. o doubt anyone has attempted this bc we’d have a lot of dead hobbyists… this is incredibly dangerous… I’m not gonna go so far as say irresponsible bc there maybe a language and cultural difference that is preventing clear communication
Face off !! Definitely you gonna get your face off after this!3500 psi seriously or you added extra zero mistakenly😐🙏😅👍other videos in this channel extremely good😍👍
I like your enthusiasm and creativity with only hand tools but wouldn't encourage people to copy this and fill to 3500psi because the hospitals are busy dealing with the virus, I don't think they have the time to put you back together at the moment.
The basic "inspiration" and visualization of the parts is great. And for engineering, the "concept" or you might say the "idea" is half the battle...thinking of WHAT you need to build But the actual construction methods here leave some areas for improvement, it's little things that us folks who literally grew up using tools would see: notice that holes were drilled without a drill press...it is humanly impossible, if drilling into a tube or a rod-type piece or material, to get a perfectly plumb hole drilling by hand. You can get CLOSE, but not as plumb as a drill-press. Next: when tapping threads, backing the tap out, using a wrench causes the tap to 'wobble' on it's travel, and so ruins the perfectly circular hole into which the threads were cut...the hole becomes elongated, and the threads therefore become a little shorter (peak to trough) on one side than the other. ...if you're making a tank which is supposed to hold 3500lbs of air, could be a BIG problem. There were many little things like this, but not worth going into detail, since this gentleman won't change his style. But anyone thinking to copy this item, try to employ better machining and fabricating techniques, for safety.
1mm thickness can hold 3500psi? i really dun know about this, not mean challenge or anything, just want to know the answer or the formula how much thickness can hold how much pressure.
@@airgunningyup Wrong! Yield strength is 235 N /mm2 for SS316 seamless. Min wall thickness is 2mm 1,5 safety factor included. Pressure Test 300 bar possible Oper pressure 200 bar is okay. Less than 2 mm is bloody dangerous. If you want to hold a pipe Bombe close to your face...Go ahead!
I recommend just buying an aluminum paintball tank and using that. Pressure tested for much higher than what they are guaranteed for, and you can add a regulator much easier.
talking about exploding.I have purchased a brand new fire powder cylinder.1 kilo.I know they take a lot of preasure.but not taking any chances.firstly.will give it a resin coating inside.thenI will lay up about 5 layers of fiberglass over the tank.and finsh it with a coat of gel.and polish it up realy smooth.So with the tank and about 3/8 thick solid fiberglass.I think it should do.will test it out a few times in my mates tyre cage for lorrys.Heres hoping.this will be my.first project.thanks to guys on here.even trying out something different by replaceing the spring systm with an ellecric air valve that can be timed for how long or short an interval of air release.at the age of 68.hope I havent left it to late.lol.👍🤬
Compressed gas is no joke! Do the math before playing with it. The load on each endcap (30mm) @ 3500 psi (241 bar) are 1700 kg or 3747 pounds ! How long will those screws take thed load ??? ... just saying ... The thicknes of the tube I´m not smart enough to calculate
@@adriandumitrascu4292 Check your calculations. M4 thread does not have a 4mm load-bearing cross section due to the fact of being threaded. You calculate the cross section of the root diameter. And 400 N/mm2 sounds like the UTS not the YS. What a fastener will "hold" is not the UTS, that is already into plastic failure or "necking" (starting at they YS) which reduces the cross-section remaining. And are we talking tensile load or shear? Accounting for the stress concentrations of the threads? Shear strength can be approximated by 0.6 x tensile strength. So low grade steel M4's will likely fail at 120 kg each. Even the highest grade screws would fail before 3000 psi, so the safe working rating should be nowhere near 3000 psi.
@@Rakemaan 400N/mm is for class 4.6 and 4.8. and yes they fail at 1.3kN (aprox 130kgforce) of force according to EN1993-1-8 safety factor is 1.25 now just in case someone try this dangerous experiment it should take in account that you need a hydraulic pipe(not a junkyard or hardware store nonsenses) with a nominal pressure above what you are going to put in (for ex for this experiment you need a 35x4mm hydraulic pipe) and endcaps need to be secured at least with 4x M6 grade 8.8 screw at least 11mm away from edge. better pick a pipe according to catalog and calculate screws according to EN1993-1-8 code (better then nothing :D )
Are you serious 3500psi cilinder that,,,?try use manometer ,,i'm not believe it because you use only 1 oring seal for 1 tube,,that's not strong may be for 3500psi,, But, ,you very creative ,,because,,i think it long time ago,,but ,i not have lathe machine,,I don't thinking waterpipe shocket can be modified,,,thank you very much,,,!you already opened my idea..succes for you always.
Im not a machinist but I have never seen anyone use a thread tap in a drill. I assume it would be an easy way to just rip the potential threads to shreds and that is why a tool turned by hand is used? Am I correct on this? Or is using a power drill an acceptable way also?
I would hesitate to tap a deep hole but if your just tapping 1/4“ piles or plate or something a drill can leave a pretty perfect thread. But it is pretty easy to Bind and break your tap and foul the hole in the process.
Dudo que con esos 16 bombasos lo hayas llenado a 3500 psi además como vas a mover tal cantidad de presion 1.No tiene regulador 2.los sellos que utilizas se pegan a cierta precion 3.el martillo que utilizas no es tan potente
Caution!! Your 1 mm pipe wall thickness is not sufficient!! Assuming a yield strength of 235 N/mm for SS 316 and a safety factor of 1,5 for seamless pipe you need 2 mm wallthickness!! Your 1 mm thick airtank can blow Up in your face. The end cap could blow Out too.
32 mm OD x 2 mm wall thickness is only rated for 2300 psi. The thinnest wall thickness at the 32 mm OD would be safe to use is 4 mm which would have working pressure of approx 3900 psi www.swagelok.com/downloads/webcatalogs/EN/MS-01-107.PDF
WARNING...! This is UNSAFE for 1mm stainless steel with OD 32mm to handle 3500 psi. It's working pressure is only 2000 psi with safety factor 1.3. It's thickness supposed to be 2 mm at least. And it must be seamless pipe.
De que material você fez o cilindro? What material did you make the cylinder ?? ¿De qué material hiciste el cilindro? 你是用什么材料做汽缸的 シリンダーはどのような素材で作ったのですか？
@ Mustafa Alper. Exactly! The guy made an extremely dangerous pipe bombe and keeps it to his face while shooting. It could explode any moment since 1 mm wallthickness is insufficient and/or end cap can blow out.
me hace gracia los videos estos, un bidon pcp con cusntos bares de presion? que le has metido 3 bares? eso no lanza ni una bola de plastico, y se le metes 200 bares revienta!
Why the air is not coming out when you pump to fill the tank (pump intake fittings) if you use quick connector only,is there one way valve in that part?
Can here for the valve. Uhh. No no no don't think I'll be making this pipe bomb waiting to happen. Maybe that stainless can take more than I think. Maybe I'm wrong here but fire extinguishers are much thicker. And maybe the seal goes first.
You can't fill 35000 psi in a cylinder made with 1mm wall thickness & single oring seal plugs without threaded don't do stupid things i appreciate your efforts though
The single o-ring seal for each plug was actually fine but everything else was not fine. PCP tube plugs are often "pinned" by screws instead of threaded. Take the Benjamin Marauder for example, the valve body (rear tube plug) is pinned by 3 screws. However, the way it was done in this video would be a catastrophic failure at 3500psi and extremely dangerous.
@@helicrashpro you are doing this concisely and know very well the outcome but think about those beginners who doesn't have knowledge of high pressure if someone tried this inspired by your video and injured himself then gues what you would be fully responsible
Hi face off I like ur videos alot in the middle of a build of my own but was wondering if u have tried using an fire extinguisher for ur air valve I've seen a bunch of videos but there's a huge language barrier in all of them lol thanks
DO NOT PRESSURIZE THAT to 3500psi, you're making a pipe bomb!!! Way too little material for safety! You need to calculate the forces involved and select the material according to design standards! 3:1 safety to yield on pressure vessels.
foot airrifle.. In my Country called 'Gejluk'.. it produced by local home made. powerfull airguns.. it built including foot air pump.. sory my english weak
I don't know how to know the number of the drill when you drill the hole with the 7mm drill the one that follows I don't know the number that appears on the Mak screen. mm Thread between the K and mm I don't know the number
Wow, I'd never have the balls to build a 3k pressure vessel. It's silly seeing as I play with 40 or 50k pressure reloading and shooting but I guess I just feel more comfortable. Haha
