Vented end caps?

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DC2

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My first thought is that it could make the Chuck take off like a rocket.

My problem I guess is that I don't understand the dynamics of the exploding battery issue. I assume it has to do with something going wrong with the battery which causes it to emit flammable gases, and then turning on the switch which causes the gas to ignite.

Can anyone clarify?

Thanks!
DC2
 

Houdini

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When a battery short circuits or is drained below the tolerable limit it gets VERY HOT and can explode. When something explodes it gives off energy and that energy needs somewhere to escape. If it can't it will blow up like a pipe bomb or the gas will escape through the weakest point. Holes in the end cap will give that energy and gas somewhere to escape. The gas does not need to ignite to be dangerous and it may ignite if a fire is involved inside. The switch does not have to be pushed for this to happen. It may act somewhat like a rocket but it's better that it happen this way instead of the gas blowing the atty off and shooting out the top into your face.
 
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The Wiz

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When a battery short circuits or is drained below the tolerable limit it gets VERY HOT and can explode. When something explodes it gives off energy and that energy needs somewhere to escape. If it can't it will blow up like a pipe bomb or the gas will escape through the weakest point. Holes in the end cap will give that energy and gas somewhere to escape. The gas does not need to ignite to be dangerous and it may ignite if a fire is involved inside. The switch does not have to be pushed for this to happen. It may act somewhat like a rocket but it's better that it happen this way instead of the gas blowing the atty off and shooting out the top into your face.
Good explanation Houdini!! These new vented endcaps should prevent future incidents from happening!!

:)The Wiz!($10 shy from a new Chuck!)
 

jeffakamax

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With the size of the hole in the end cap, I highly doubt there will be any rocket action. The venting is violent, but very short-lived. There is not enough volume of gas produced to provide thrust. With a smaller hole, perhaps but still unlikely. I am anxious to get BigD's back for analysis. I should be able to get a good idea of internal pressures by examining the internals and any structural fatigue. If my estimations are even close, the vent I am putting in them now is more then adequate. If not, I will address it and compensate accordingly.

With the hole in the end cap it is guranteed that any venting will be away from your face and fingers.

If you knew the rediculous things I have done to batteries trying to get this to happen. I should post a pic of "Franken-Battery", my very un-willing test battery. You folks wouldn't walk near it... yet it remains intact and still functional.

FWIW... Inside the CHUCKS you can see the battery isolator. The disk with the screw that the battery makes contact with. This is a relatively snug fit that will minimize any particulate matter from exiting out the atty end. To hold this in place I had the option of using in internal sleeve (much the way some flashlights are built). I opted to sweat solder in a ring inside the chucks as the retainer. This is a much more structurally sound way as hypothetically should the head cap be comprimised, the internal keeper is not going to move.
How much of this is really needed? Probably alot less than what I have provided. But these are the things that keep me awake at night.
To me, a bomb-proof diamond plate mailbox sounds completely reasonable. Everyone makes fun of me for my rediculous overkill attitude.... until it's put to the test.
That bad ice storm we has a few months back leveled a bunch of trees out at my sisters. Einstein's house had an 8" limb across it in the morning... and they were all fine, no damage to the duck house. It't things like that when I stand back and say "see" that's why!
 
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Houdini

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FWIW... I opted to sweat solder in a ring inside the chucks as the retainer. This is a much more structurally sound way as hypothetically should the head cap be comprimised, the internal keeper is not going to move...
Internal safety measures the end user never sees. NICE! You should make a cut-away version so everyone can see exactly what's going on inside one of these beauties.
 

beecee

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Dec 7, 2009
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Valley of the Sunstroke
I was thinking of having someone do the hole for me or do it myself.

I have all my Dads tools and guess I can do it myself (miss you dad!) but not sure which bit to use.

Or I could send it back but I just got it :( but I value my face and don't want anything bad to happen although it seems to be very rare and not happening with the batteries I use. hmm...
I trust my chuck and I'm not so worried but do understand the necessity of the vent hole.
 

Debbie

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Dec 13, 2009
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Sounds like BigD was actually lucky that it was a chuck he was vaping from, and not some other mod. It could have been worse.

Debbie

With the size of the hole in the end cap, I highly doubt there will be any rocket action. The venting is violent, but very short-lived. There is not enough volume of gas produced to provide thrust. With a smaller hole, perhaps but still unlikely. I am anxious to get BigD's back for analysis. I should be able to get a good idea of internal pressures by examining the internals and any structural fatigue. If my estimations are even close, the vent I am putting in them now is more then adequate. If not, I will address it and compensate accordingly.

With the hole in the end cap it is guranteed that any venting will be away from your face and fingers.

If you knew the rediculous things I have done to batteries trying to get this to happen. I should post a pic of "Franken-Battery", my very un-willing test battery. You folks wouldn't walk near it... yet it remains intact and still functional.

FWIW... Inside the CHUCKS you can see the battery isolator. The disk with the screw that the battery makes contact with. This is a relatively snug fit that will minimize any particulate matter from exiting out the atty end. To hold this in place I had the option of using in internal sleeve (much the way some flashlights are built). I opted to sweat solder in a ring inside the chucks as the retainer. This is a much more structurally sound way as hypothetically should the head cap be comprimised, the internal keeper is not going to move.
How much of this is really needed? Probably alot less than what I have provided. But these are the things that keep me awake at night.
To me, a bomb-proof diamond plate mailbox sounds completely reasonable. Everyone makes fun of me for my rediculous overkill attitude.... until it's put to the test.
That bad ice storm we has a few months back leveled a bunch of trees out at my sisters. Einstein's house had an 8" limb across it in the morning... and they were all fine, no damage to the duck house. It't things like that when I stand back and say "see" that's why!
 

Poeia

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Just to clarify, is a vented end cap recommended (or even advised) if I only use protected batteries marked as such from a reputable supplier ? In other words, if I'm not using unprotected batts, theres no risk of explosion/fire/mutilation right?
Minimal risk. Much less risk. Drug store AAA batteries can explode -- they just don't do it very often.

There's no reason not to get a vented end cap. If you create enough pressure in a completely sealed chamber, the whole thing will explode. Mods, including Chucks, aren't completely sealed. There's some space at the button (where your hand is) and at the atomizer connection (where your face is.) So the good news is, in the unlikely event of your battery going haywire, those spots would fail before your Chuck turns into a pipe bomb. The bad news is those spots are where your hand and face are.

A vent hole provides an easy escape for those gasses so there won't be much pressure to shoot your atomizer at you. Jeff's willing to add it for the price of postage. Get it.
 
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