Questions on a new mech mod. Vent holes etc.

[DeloresRose]

Great process Documenting and calculating without the aid of simple calculators is an excellent way to familiarize yourself

The math is the hard part. I have tried it the old school way with paper and pen, but I always double check it with steam engine lol. I used to sell carpet and could calculate a pattern match on stairs with an odd width carpet - in my head.

 

[Dr. Seuss]

I’ve since tinkered around with a box mech, 21700 using a 30T that Mooch cleared as having 35A continuous. Hitting the calculator a .2 ohm with the full 4.2 being used to figure it comes in at 21 amps. So, with the overhead of amp allowance and with counting the battery as 4.2 I feel like I’ve allowed enough cushion room to be alright. So far the lowest build I’ve used was a .25 so that is a little additional cushion as well. I still can’t relax around it though, not like with a regulated. I’m ocd with my battery wraps and always snug my atomizers screws for the coil leads before use for peace of mind. So in all reality I’m covering all my bases, it’s all psychological why I’m uneasy now.

You ever play with firecrackers? Have you ever lit one, ran off to a good distance, see the wick burn to the body of the firecracker and........nothing. You wait....you see a little smoke... it’s still lit.........nothing. So you wait.... and wait..

That feeling right there in that moment is what I have stuck in my head. It’s just the fear that if something did happen it would be so rapid and so close to my face and neck that there would be no warning.

Other than that, with everyone’s help here and Mooch vids I actually understand it at this point (I feel). I’m still leaving that tube on the shelf though, I don’t like the no vent holes. I’m thinking about drilling some in around the top of the tube just underneath the inner threads. I could get 3 around it and have it still look good. I can’t honestly say whether it would make any difference, I feel like it would help but of all the threads the 510 are the smallest/weakest so that’s what’s going to pop I think. It would be amazing if a battery rupturing could actually make that tube tear but with some holes that would relieve a bit of pressure but it would all be so fast in a worst case scenario I’d worry about the 510 still.

What would be interesting is if somehow you could clamp a tube, clamp an atty and measure how much it took to pull them apart. Do that to all the common tube materials and get a general sense. Then figure out how much pressure it takes to split the tubes. Basically get a better idea of what force all the weak points fail at. I get with all the different mod specs the numbers would be all over the place but if one ‘standard’ design was used to test it would give a ballpark range to compare other styles too and get a general sense of what kind of pressures we’re talking about here. Just wishful thinking but it would be cool none the less.

 

[Punk In Drublic]

@Dr. Seuss

I would suggest against modifying any device. Not only are you compromising integrity, you are also adding a level of risk. What if a metal burr from your modification was not found – easy tear of the battery wrap and dead short.

Also to note – a regulated device is no safer at containing a thermal runaway. It too relies on your battery wraps being in pristine condition. It too can over draw the batteries. And it too can cause a battery short. It may add an atomizer short protection, but what if something failed else where in the circuitry?

 

[Dr. Seuss]

I don’t think 3, 1/8” holes would be of any concern for the tube, it’s not bearing weight or interfering with conductivity etc. I’d brainstormed beveling the edges of the holes for appearance and to cancel out any chance of scraping the battery wraps and I’d definitely make sure there wasn’t any shards sticking around in there. I’ve run my plans past a few people who are more well versed in modding/drilling metal etc and everything seemed within reason.

In regards to regulated vs unregulated I understand the rules apply to both but from a Vegas odds standpoint there’s a bit of a difference. For the same reasons you see threads and articles, youtube videos etc where people talk differently about them. I always make sure to build within the rules on my regs for the fact that I don’t really sit comfortably with relying on lowest bidder Chinese circuitry. I think that my issue is all psychological more than really anything I’m doing. If I had any doubt I wouldn’t put it to my face and pull the trigger so it’s just that it’s new. I relax more with regulated and there’s a lack of it with the mechs. That will most likely change as time goes on.

That’s something I’ve wondered about though and don’t see much written about it. Especially now and in the future when the regulated mods come to an end and people are going to need to make what they have count, how exactly do mods die? Is it better to use them for a period of time and retire them or just use them until they fail? I don’t know enough about them to know how they’re constructed. So when they fail is it always at the same point of the mod, or is it random chance where and what part fails? You know what I mean? If the wrong point failed that could be bad because you would have no idea that it failed.