manufacture air cylinder
Hello,,
Can I use aluminum 6061-T6 in the manufacture of air cylinder 1.5 OD X 0.125 wall for 200 BAR ?
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I do read them and know what does Omerta means.Therefore never find you on them (note/books)but if i will someday,then you ll need luck 😆 .
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Good luck[/quote]
Lucks got nothing to do with it.
Go read your books.
I dont care what did you test …..you can test it even at 1.000.000.000.000.000.000.000 x 10³psi…it doesn’t make sense to me because i spend half of my life under Hangars and i know titanium and air better than you and don’t give a shit if you and other members don’t know me because neither do i.
Titanium looks strength under HP but its sly.Thats all i know and explain why,in my previous post.
Again,this is my Fuc***ng opinion and silence will be my answer for the rest of your post.I m done with this thread.
And don’t talk to me about engineering…Twin towers looks durable for decades as engineers and architect guaranty,but they fall (does’nt matter how)even if were hit in the middle…
Bang is Bang ..after this you don’t need to explain even if they still thrust you.
I m not a conspiracy theorist and speak “generally” to answer to the Thread…not you.You made a thick wall and you done wised.
Once again..”strength and longevity are parallel ways”…everything make its cycle but how big is that cycle few people are able to know,and this is what i know for me…
..I want to belong to the”few”…low profile and privileged
…and you have to beleive me. noone on my “cycle” call me a looser up to this time.
Good luck
I have pressure tested my cylinders to 700bar personally.
i have done this with the tube clamped in a vice end ways on so the plugs didn’t blow out.
then again (outside) to 700bar to see what the plugs would blow at.
The plug threads still didn’t blow.
I have video’s of this and will post them on this thread.
700 is as high as my gauge and hoses will go. But the pump can reach 100’000psi.
I will get a higher reading gauge and do all tests agian till failure on both tube and threads.
I dont sit and guess what will happen. I spend my time and my money on finding out for sure.
Any1 can sit behind a keyboard and decide what can and cant be done.
There are some outstanding engineers on this forum (you know who you are 😉 ) that know what i mean.
We do the hard work so you dont have to. :whoop:
anyhoo. Im off to finish the program for the in tube regualors.
Later, Sean.
Thats another reason why i don’t use titanium..
Anyway..4130 umber alles..
IMAO,maybe 7075 and titanium can handle very easy this kind of pressure but what about elongation?
4130 steel remains where it is even after 1000 years of daily air filling/release.
Take an aluminum or titanium wire and keep it in the middle with your hand and bend the other side with the other hand at close distance once right and once in left several times no more than 2-3mm for each side.
Suddenly it will break in the middle….Now do the same with a 4130 steel wire….it is a matter of crystalline fabric of metals or else its all about density.
Titanium
* Density:
.174 lbs/in³
(4.82 g/mm³)
* Elastic Modulus:
5,350,000 psi (36.9 GPa)
Steel
* Density:
.285 lbs/in³
(7.90 g/mm³)
* Elastic Modulus:
11,500,000 psi
(79.3 GPa)
Conclusion:For someone who loves modification and install/uninstall parts several times on his rifle while every time must release and fill the rifle with air,noone can guaranty about long term using without an accident…..On the other side if you keep a 4130 steel tube away from rust with a nice bluing,your Safety has never been a concern.
Have you ever seeing a titanium Diving bottle or a aluminum spring ?…Do you think that it will be expensive….so what…There are prices for everyone…For example some people paid for an Atlas bipod instead a Harris but noone saying that Harris is a crap….always the money talk…if you have it you can kick asses but in our case(cylinders) it is a matter of our life.
Some airgun manufacturers are not stupid..They want the maximum be possible of having a peace of mind even from people without bias and those who forget to make an Hydrostatic control every 5 years too….Thats why they choose the best..even if the best is heavy ,knowing that their customers decisions affected negatively cause of this factor.
Can you imagine what kind of Kicks accept a cylinder every time the valve close suddenly?????… Although some people think of a balanced pressure inside the tube..it is not like this for sure.Ti may have a high tensile strength so it can’t break(almost impossible)…but… it could be possible cracked after 10.000 ON/OFF!!!!…
…imagine a crack appearing while your cylinder have 200-250 bar on it… ➡ ➡ ➡ ➡ :6: ❓ ❓ ❓ ❓ ..and then a huge shine which blind you for a while—-‘SILENCE’——-…..Your view came back slowly and suddenly you hear a voice…WELCOME TO PARADISE!!!..Your visa please!!! …What????..You haven’t got one???.. Hey Jesus..that guy said that he don’t have papers,he just keep a broken Daystate–…Ohh..i see(Answer from the sky)..Send him on Giant Squirrel land ,i m sure they have a lot to talk eachother 😆 LOL.. just kidding.
If you like alu or Ti go as thick as you can to decrease expansion but that way you have no more benefits vs steel considering weight.
Try to cut in half and measure the thickness of an AF air reservoir 🙂 ..it builds like a tank(1.8lb) no matter if mines marked as AA6061 and be tested at 375 bar…8-)
The only negative factor about steel is the filling time.You have to fill really slowly because steel have better thermal conductivity and if you go very fast it warms too much under high pressure and gets cold slowly keeping hot the the air inside the cylinder for a long period .
So after a long time the seat of plastic valve melts slightly(soften) at passage of time and goes deeper (as far as accept that HP)affecting velocity because valve need more backward movement to bring the old result concerning when our rifle was new through the same hammer usually used .
Have you ever see a smashed head by PCP accident?…I don’t neither want to do.
Anyway,strength and longevity are parallel ways …
Don’t want to be a smart ass..this is just my opinion…You can avoid that but you can’t leave it aside because maybe i know what i m talking about.
As far as im ware you cant anodise black.
The left ones are powder coated. The rest are anodised with differant voltages
Hi,,
How to black anodize Titanium
I like the use of the umbrella, LOL. I hope that tube wasn’t pressurized to 500 bar while you were standing there.
You are right – groove at the end of thread was too deep and tube broke down there.
Yes, tube was deform after 500 bar test – You can see it in the table with measurements. After the beginning of deform tube broked at 530 bar.
Umbrella is wery necessary thing – when the tested tube broke down there was a lot of drops of wather around 🙂 And I was standing right at the tested tube – it’s not blast after break, it simply felt apart. The water test is secure.
Here are a couple I made.
This one is 2024 but I can’t remember dimensions as it was long time ago I did these.
AR6 with extended tube & shroud this one is 4130 if I remember correctly & actually not that heavy since its only 2mm wall.
This is titanium with 7075 “Hollow Fittings” for extra air & also it expands & help push on the threads.maybe,lol
Again, Ti with 7075 caps
Hi,,
Edgun Tube D 16T 36mm OD X 3mm wall 😉
Looks like it failed at the threads where the ID is thinner. Did the tube deform during the testing? It’s over 1/4″ thick so I would hope not.
I like the use of the umbrella, LOL. I hope that tube wasn’t pressurized to 500 bar while you were standing there.
I don’t know exact weight of the cylinder, but it very light – something about 0.7-0.8 kg. This tube is wery strong – such tube, but machined down to 36.13mm diameter, was broke down at 530+ bar hydrotest:
And table with measurements:
Length of air cylinder is about 500 mm. Outer diameter 37 mm, inner diameter 30 mm. Material is D16T (it’s russian hard aluminium alloy, something like 7075). This air cylinder was hydrotested at 450 bar.
What’s the weight of your tube? Any reason why you picked 7mm thickness as oppose to something in the 3-5mm range to keep the weight down?
Anyone know the specs of the Edgun tubes OD/ID/length/weight? Didn’t realize it was 2024-T3 until now.
Thank You for info! I didn’t know it.
And one more about aluminium tubes – if You can’t find a tube – You can made it by Yourself. Simply take a aluminium rod and drill a hole through it. It’s not a joke – I have see such cylinders twice. One time it was 35×3 mm cylinder for Stеyr LG100 and other time – 37×3.5×500 mm for HW-100.
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Any body fluent in jiberish ?