Read up on fatigue life of Steel versus aluminum. even at 300 bar cycle aluminum enough times it will fail. Whereas a design of Steel with smaller safety margin is considered safe because steel below a certain threshold is considered to have an infinite fatigue life. The reason for industry standard larger safety margins with aluminum is because you are trying to compensate for aluminums poor fatigue life. So in real world use the cycle limit will never be hit."Most aluminum alloys loose strength with heat."
You should correct that sentence to All metal alloys loose strenght with heat. Very basic thing of material design, you should know that.
A question about that cylinder MJP cut in half. If you use that kind of cylinder as intended, only filling to 300bar, when will it break? Safety factor on safety factor is a great thing, but what happens in the real world?
I am not sure if that can be predicted numerically. I think there must be fatigue tests involved.If you use that kind of cylinder as intended, only filling to 300bar, when will it break?
Wow, it seems the maximum stress is reduced by close to 50% if the drill with a classical angle is used. Have we just found a potential root cause of the explosion?In deed it does, at worst you could be talking roughly a minute given how fast your machine is and how fast turret from tool to tool. But tens of seconds any case.
And then we get to the original design with 118deg drill bottom.
It looks better if the material is correct.
But if not then it's again anyone's guess.
Simulation on the dimensions I have, not necessarily concerning all products as there seems to be more than one variants.
Marko
Wow, it seems the maximum stress is reduced by close to 50% if the drill with a classical angle is used. Have we just found a potential root cause of the explosion?
If so then this is insane how a small change in the geometry can lead to disastrous consequences. It could be committed by an unaware worker. But anyway, it should've been detected during QA.The maximum stress location changes into the threads with a 118 degree drill angle if I understand correctly, the threads are not under pressure and would evacuate air if the seal failed (I hope).
If so then this is insane how a small change in the geometry can lead to disastrous consequences. It could be committed by an unaware worker. But anyway, it should've been detected during QA.
So anyone willing to open theirs to take pictures from the cylinders if there is a sharp corner or not would be great.
Although I do not own a edgun. Im reading (skimming) through pages... Your comment definitely caught my attention... I've been a machinist for over 30 years and have made a lot of things over the years... Yes small changes do and will make a huge difference in a given part... These Minor changes definitely affect things.. I've seen machinist that have the ignorant mind setIf so then this is insane how a small change in the geometry can lead to disastrous consequences. It could be committed by an unaware worker. But anyway, it should've been detected during QA.