How much wire do you use in your coils? How many Loops

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ukeman

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it also depends on the diameter of the wick.
3/4 wrap on a typical say 2 to 2.5mm wick w/ 28g will get you that.
If you are making a micro coil with a 1.5mm or 1/16" ID, you will need almost twice as many wraps to equate the above length.
And there is tail length to consider, but best to keep tails on the short side.

Use multi meter or ohms reader to check your work; for safety sake
 

pastubbs

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Well the best thing to do is get an ohm meter or a mod that reads the ohm, but I understand that some people don't want to do that. Here's a little chart I used before getting a meter. Its actually fairly accurate to about +/- .1ohm. This methods is better because its based on the length of wire not the number of wraps. Asking someone how many wraps they use is useless unless they tell you the ID of the wraps.

28 awg (O/in) 0.44 ohms
30 awg (O/in) 0.7 ohms
31 awg (O/in) 0.9 ohms
32 awg (O/in) 1.2 ohms
33 awg (O/in) 1.4 ohms
34 awg (O/in) 1.8 ohms
35 awg (O/in) 2.3 ohms
36 awg (O/in) 2.9 ohms
 

pastubbs

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If your going for subΩ the easiest determining factor is the gauge of Kanthal you use. 28 Gauge on a dual coil yields me .5-.6Ω on a 3/4 wrap easily.

As a rule of thumb more wraps are used to create more resistance.
That's pretty much my go to wrap for a rebuildable dripper. I get about .75ohms on my 3/4 wrap though I like to get a little more silica in mine so I can go longer in-between drips.
 

NicoHolic

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With resistance wire, the higher the gauge number, the smaller the diameter and the higher the resistance, for a given material. For example, for equal gauge number and diameter, Nichrome 60 is lower resistance than Kanthal A1.

There's also what you're wrapping the coil on--its inner diameter For example... are you wanting to make a micro coil for a rebuildable drip atomizer by wrapping it around a 1/16" drill bit? Or are you wrapping it around rolled stainless mesh or a ceramic wick for a tank-type rebuildable atomizer? Or what?

The larger the gauge and the lower the resistance of the wire, the more wraps you have (compared to higher resistance wire). This increases the wire to wick to juice contact area, improving heat transfer and reducing the temperature at any one point; however, this increases the mass of the coil and slows its heat up time, so you're looking for a happy medium.
 
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