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Understanding Coils, Wire Gauge & Ohms
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SCutshall Offline
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Post: #1
Understanding Coils, Wire Gauge & Ohms
If I want to make a 1.8 ohm coil, for instance, how does wire gauge size play into this, how does number of wraps play into this, how does the size of the core or jig play into this?

Also, I am seeing premade coils with various names... what are these, their differences, their usages? Are those specific purpose built or just wrapping styles?

What are the available types of wire for building coils and what are their pros and cons?

Lastly, what comes first in the pecking order... knowing where you want your mod's wattage for vaping to be or knowing your preferred ohm for a coil? For instance, I have been told a 1.8 ohm coil vaped at 9-11 watts will be optimal for MTL for me (and it appears to be)... so what happens with that same coil at 40 watts and what happens with say a 0.5 coil at 9-11 watts?

As I await delivery of my first RTA I am wanting gain a better understanding of all this.

Many thanks in advance.
20-05-2017 06:14 AM
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Robjenko Offline
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Post: #2
RE: Understanding Coils, Wire Gauge & Ohms
Kanthal and Stainless are the main wires there are others but for simplicity lets stick to them Kanthal is for power (watt) vaping Stainless can be used for power and Temp Control. The list for types of coils is long but for a 1.8 ohm build a single strand is best. Check out Steam Engine Here

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20-05-2017 06:45 AM
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SCutshall (05-20-2017)
Don Offline
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Post: #3
RE: Understanding Coils, Wire Gauge & Ohms
Basically the thicker the wire (smaller gauge number) the lower the resistance. Given the material stays the same.

A given gauge of SS316 wire is roughly half the resistance of the same gauge Kanthal.

Where this can cause issues is when making a coil high enough resistance. If you have an inch long coil it is not going to wick well and will burn the wick almost immediately. I'd not go past ten turns of any wire, and prefer to stay under 7.

I almost always use a 3mm coil as long as it will fit in the atomiser (Smaller atomisers often have better flavour than larger). So with 30 gauge Kanthal that is five wraps to get a single 1.8 ohm coil which should work best at around 10W.

Using 30 gauge SS316L I'd need 11 wraps to make a 1.8 ohm coil. This would not be practical.

I prefer to use 26 gauge or thicker wire as the coils will survive rewicking better than thinner wire. However, with SS316L I'd need 25 wraps to get 1.8 ohms. Using a coil that huge (It isn't going to fit in most atomisers and is going to burn the wick in about three draws) is a bad idea.

Even with Kanthal you are going to need 13 wraps.

I tend to aim for resistance around an ohm as I don't like thin wire much.

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20-05-2017 09:21 AM
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LilFracker Offline
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Post: #4
RE: Understanding Coils, Wire Gauge & Ohms
(20-05-2017 06:14 AM)SCutshall Wrote:  If I want to make a 1.8 ohm coil, for instance, how does wire gauge size play into this, how does number of wraps play into this, how does the size of the core or jig play into this?

Also, I am seeing premade coils with various names... what are these, their differences, their usages? Are those specific purpose built or just wrapping styles?

What are the available types of wire for building coils and what are their pros and cons?

Lastly, what comes first in the pecking order... knowing where you want your mod's wattage for vaping to be or knowing your preferred ohm for a coil? For instance, I have been told a 1.8 ohm coil vaped at 9-11 watts will be optimal for MTL for me (and it appears to be)... so what happens with that same coil at 40 watts and what happens with say a 0.5 coil at 9-11 watts?

As I await delivery of my first RTA I am wanting gain a better understanding of all this.

Many thanks in advance.
1-the smaller the wire (higher ga #) the harder it is to push power through which creates heat. The bigger the wire (lower the ga #) the easier it is to push power through so not as much heat is generated. So a 30ga wire needs much less wattage than a 24ga wire to heat up. All wire has a given resistance for a set length so the bigger the coil diameter and the more wraps used means the longer the wire used so the higher the resistance.

2- Kanthal is probably the best to use right now as the other wires have very low resistance values that would make it impractical to build high resistance coils

3-I would say IMO wattage is your guide to what coil to build. It is limited to the the device being used as well as what you yourself prefer for vaping. That being said try to build a coil to meet both these. No use having a coil for 100w vaping if your device ill only do 30w.You will take for ever to heat up coil if at all Also you do not run a coil designed for 12w vaping on a device set to run 100w as you will heat the coil so fast it will burn out.

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20-05-2017 10:32 AM
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SCutshall (05-20-2017)
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RE: Understanding Coils, Wire Gauge & Ohms
Thank you all... I now understand this much, much better.

Another for you... so a homemade coil, 30g, say 1.6-1.8 ohms, fired at 12-10 watts paired with a 70/30 VG/PG liquid would last how long as an estimate/guesstimate?
20-05-2017 06:20 PM
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Pulsar Offline
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Post: #6
RE: Understanding Coils, Wire Gauge & Ohms
The cotton would last about a week or two, or until you notice taste starting to fall... the coil should last quite a while as long as you take care when changing wicks and quenching the coil between rewicks. 

By quenching, you pulse the coil til its red hot, and run it under cold water. It will remove any buildup from the juice

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20-05-2017 06:54 PM
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SCutshall Offline
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RE: Understanding Coils, Wire Gauge & Ohms
(20-05-2017 06:54 PM)Pulsar Wrote:  The cotton would last about a week or two, or until you notice taste starting to fall... the coil should last quite a while as long as you take care when changing wicks and quenching the coil between rewicks. 

By quenching, you pulse the coil til its red hot, and run it under cold water. It will remove any buildup from the juice

Okay, so to do this I am removing the coil (I would assume not because I would have already cut the excess wire when installing it new) or removing the tank from the mod and running it under the tap or using a wet cotton swab or what precisely?
20-05-2017 07:43 PM
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Fatboy Offline
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Post: #8
RE: Understanding Coils, Wire Gauge & Ohms
(20-05-2017 07:43 PM)SCutshall Wrote:  
(20-05-2017 06:54 PM)Pulsar Wrote:  

Okay, so to do this I am removing the coil (I would assume not because I would have already cut the excess wire when installing it new) or removing the tank from the mod and running it under the tap or using a wet cotton swab or what precisely?

Pretty much everything you will need to know to wrap and wick like a star! Smile



















20-05-2017 07:59 PM
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SCutshall Offline
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Post: #9
RE: Understanding Coils, Wire Gauge & Ohms
^my wife just saw your reply and I quote, "thank him from me please... you're annoying me today and with the abundance of videos to now watch, I'll talk to you next year."
There ya go, thank you.
20-05-2017 08:04 PM
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RE: Understanding Coils, Wire Gauge & Ohms
Hmmm you're welcome! Tongue
20-05-2017 08:21 PM
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