coil wraping??

[suspectK]

No I haven't messed with my airhole.

I tried a nano today. The wick is so small that I wrapped it in a pretzel shape to have a bed-like area underneath it. It's working great. I used my needle leads from multimeter to wrap with. They were suppose to send me 2mm. It seems to be 1mm compared to my 3mm, but I'm cool with trying new coil sizes. 3.4ohms.

I almost built it perfect, but the first coil starting from the common post is spread apart. I have tried to get it together, but I don't want to jeopardize what is a really good build to try to fix that. So far the little wick making a bedding underneath is helping me not have to drip much with the thin wick.

After it dries up, I'm going to take the pretzel out.

 

[Vwls]

wire has a set resistance per foot and can be found on the manufactures site. divide by 12 to get resistance per inch. decide your target resistance, take a length of the wire the appropriate size with some extra length so you can work with it. mark with a sharpie the exact length needed and wrap your coil so that the marks would line up with the connector posts once installed. you will end up with the right resistance no mater how well you wound your coil. note it will have the same resistance even if uncoiled (straight)

I have not found this to be true. Wrap a loose or standard coil, install it on your atomizer, and measure the resistance. Now fire, heating the coil till it glows red, let go of the firing button, and squeeze the coil gently with tweezers to tighten it (making all the loops touch snugly). Now measure the resistance again. See? It changes.

I have read repeatedly that it is the length of wire that determines resistance and that nothing you do to the wire will change the resistance of that length. But much experimentation has shown that this is not true. (I'm using a Provari with a brand new battery to measure resistance, in case anyone is questioning these results.)

So basically, with wire installed and at its final length (ends clipped, etc), micro coils (all coils touching) do produce a different resistance than standard coils (space between coils).

 

[The Vagabond]

I have not found this to be true. Wrap a loose or standard coil, install it on your atomizer, and measure the resistance. Now fire, heating the coil till it glows red, let go of the firing button, and squeeze the coil gently with tweezers to tighten it (making all the loops touch snugly). Now measure the resistance again. See? It changes.

I have read repeatedly that it is the length of wire that determines resistance and that nothing you do to the wire will change the resistance of that length. But much experimentation has shown that this is not true. (I'm using a Provari with a brand new battery to measure resistance, in case anyone is questioning these results.)

So basically, with wire installed and at its final length (ends clipped, etc), micro coils (all coils touching) do produce a different resistance than standard coils (space between coils).

what you are seeing is correct, a micro coil will "short" in places where there is no oxidation but still heat the bypassed coil due to its proximity. the resistance of the micro coil may change over time as oxidation builds or may remain stable if it fuses together where it is shorted. its sort of a tube of resistance metal with attachment legs. this is build / builder specific as someone gets more and more proficient at building their micro coil, their micro coils will become more consistent. Also resistance of these wires are generally stated at room temperature and change with temperature

A quick test / proof of this is to build a micro coil with two wires, where both wires are flat against your wrapping form and alternating. with wire A separated by wire B. Clip wire B's legs short and only attach wire A's legs to power.
What do you expect: (
(A) 2 times the resistance of the single wires length
(B) 1 times the resistance of the single wires length
(C) A resistance somewhere in-between 1 x to 2x the resistance of the single wires length
(D) Half the resistance of the single wires length

Happy experimenting - anyone care to guess?

Bonus Questions
Will all the wires glow?
1) yes
2) no
will this vape well?
3)yes
4)no

 

[Ryedan]

Quick question concerning this thread. Since electricity always follows the path of least resistance and no two coils are the same (down to .001 ohm), how much can the coils vary and still function?

I don't use dual coils yet but I think it is relative. Think of two water pipes, one having twice the cross sectional area (less resistance) of the other. Give both the same pressure (voltage) and you will have about twice the water (current, or amps) pass through the bigger one. You will not have all the water take the path of least resistance, in this case the bigger one.

Someone please let me know if I got this wrong

 

[shad0w13]

so from what im seeing not every one uses a dual coil im using a resident clone it looks to be set up to use dual coils so me being an idiot thought it had to be.

so my question now is does cotton taste better with a single coil or dual coil micro coil or standard coil? or atleast what do you prefer im getting a weird taste out of my cotton looked and saw no hotspots it just taste a bit weird

 

[searcher]

The water analogy was good and also illustrates what I was asking. I`m sure that a couple tenths an ohm will not be noticable. Can`t wait for my dual coil rba to arrive.

 

[suspectK]

It's actually 4 times the surface area in parallel and really the same surface area in series.

I'll skip the formula bs. 1.5ohm dual in series is two 3ohm resistors, two resistors, each twice the value of the equivalent resistance. A 1.5 series will be two 0.75 ohm resistors. I see them pointless, but I'm sure some have found them to work well with certain flavors.

I'm a fan of dual coil cartomizers, but I haven't used them in tanks consistently in 6months. I'm looking into a RBA designed for dual coils with a tank and dripping. So far I've only found one of either.

Any recommendations? I don't get a chance to use my AGI as much as I'd like, and I'm about to jump on the kayfun train. So I don't want to spend much if I'm getting that+the pv designed for it..

 

[Vwls]

so my question now is does cotton taste better with a single coil or dual coil micro coil or standard coil? or atleast what do you prefer im getting a weird taste out of my cotton looked and saw no hotspots it just taste a bit weird

No doubt for me that a micro coil produces better flavor and vapor than a standard coil.

I have a Trident on a mechanical. I've tried dual micro coils with cotton at a variety of resistances, but haven't been able to get it to vape as well as a single micro coil. The vape is improved a bit I've found by wrapping the micro coil on a slightly larger drill bit (3/32 instead of 5/56). This enables me to feed a larger piece of cotton through without choking off the ends of the coil, and increases vapor a bit without diminishing flavor. But as mentioned earlier in this thread, a lot of factors contribute to the overall results, including height of coil from the deck, position of coil between the posts and the edge, size and level of air hole, tightness of coil, density of cotton, etc. It may be that I am simply able to get a better vape from a single coil because it's easier to control all those factors on one side of the atty as opposed to two.

 

[shad0w13]

No doubt for me that a micro coil produces better flavor and vapor than a standard coil.

I have a Trident on a mechanical. I've tried dual micro coils with cotton at a variety of resistances, but haven't been able to get it to vape as well as a single micro coil. The vape is improved a bit I've found by wrapping the micro coil on a slightly larger drill bit (3/32 instead of 5/56). This enables me to feed a larger piece of cotton through without choking off the ends of the coil, and increases vapor a bit without diminishing flavor. But as mentioned earlier in this thread, a lot of factors contribute to the overall results, including height of coil from the deck, position of coil between the posts and the edge, size and level of air hole, tightness of coil, density of cotton, etc. It may be that I am simply able to get a better vape from a single coil because it's easier to control all those factors on one side of the atty as opposed to two.

thanks a may have to give that a go then and see how it goes

 

[Blury 1R]

I concur my AZ friend I also found that formula great. one Micro coil, fat wick(cotton), big power and ample air to match = flavor cloud... like blow your taste budz out!
I'm at the point my currant PV cant keep up or cutoff kicks in mechs have this game wrapped. my currant coil I have been playing with to deal with my PV is a large dia coil 30g wrapped 3/4 and it is one of the hardest one to through but it ramps faster. I got the idea from coils I was taking of my RDA. found the biuld up was only on the center coils of a 30g 7/8 wrap and dead center. so i loped the end coils and went with a bigger diameter.
keep wrappen shadow.
O have you guys had any luck with nano's I mean not just work but a revaluation like a micro?

 

[Blury 1R]

have you tried twisted kanthal? i love it. you get more surface area in contact with the wick and a lower resistance. i make 1.3 ohm .32 gauge twisted kanthal coils that perform better than .8 ohm .28 gauge solid coils. after you twist the kanthal you gotta torch it with a butane lighter to take the spring tension out of it, when you torch it you want it to glow and run the torch down the length of the wire 2 times any more than that and your are going to increase the resistance of the twisted kanthal.[/QUOTE]

twisted 32 or smaller .... I have not seen it do you have a pic? care to elaborate the build a little more?

 

[Vwls]

I definitely want to try twisted Kanthal - this seems to be cropping up a lot lately in my "research."

 

[suspectK]

I need to measure my lead that I use to wrap my coils it looks to be near 1/32", but the wick has to be small that I use a wick+bed. I just wrap my wick underneath it to keep from having to redrip. I'm sticking with this build style for now on though..

 

[suspectK]

I definitely want to try twisted Kanthal - this seems to be cropping up a lot lately in my "research."

How easy is it to use twisted a-1 in a micro coil? I see that being too much of a pain. You'd probably need a really consistent twist to not have more hot spots than you probably would already get.

 

[The Vagabond]

How easy is it to use twisted a-1 in a micro coil? I see that being too much of a pain. You'd probably need a really consistent twist to not have more hot spots than you probably would already get.

in twisted coils you want to heat / temper most of the springiness out of the wire, this will oxidize the wire and make it easier to wrap. the oxidation will prevent hotspots ad effectively make that single coil a defacto duel coil. it will measure half the ohms of the wire used

 

[Lessifer]

I've only made one true dual coil so far, and I wasn't all that impressed, but I think that was due to my build. I've only recently started using mechs and am wary of going too low in resistance. I like a single micro at ~.9ohm, the dual I made came out to .9ohm also, so two 1.8 ohm coils, and I think the mech just wasn't putting out enough power for it, which I think is why you usually see duals at .5 or lower. As for twisted wire in a micro it can be done, there's quite a few examples in the big Micro thread, but you can also do a "parallel" wrap, where you wrap the two wires side by side simultaneously, you get the same effect as twisting from what I understand.

 

[Lessifer]

No I haven't messed with my airhole.

I tried a nano today. The wick is so small that I wrapped it in a pretzel shape to have a bed-like area underneath it. It's working great. I used my needle leads from multimeter to wrap with. They were suppose to send me 2mm. It seems to be 1mm compared to my 3mm, but I'm cool with trying new coil sizes. 3.4ohms.

I almost built it perfect, but the first coil starting from the common post is spread apart. I have tried to get it together, but I don't want to jeopardize what is a really good build to try to fix that. So far the little wick making a bedding underneath is helping me not have to drip much with the thin wick.

After it dries up, I'm going to take the pretzel out.

Looks like a good coil you should really try cotton though, it plumps up to fill the coil completely, and holds a lot of juice within the coil that can be vaporized, and once you get used to it you can taste when it's starting to get dry long before it gets singed.