how to get the desired ohms when building a coil?

[mexin69]

i ordered a subtank mini and an eleaf 20w... i was gona use the 1,2 ohms coil that should have came with it but i got 2 0.5 ohm coils instead. so my friend is gonna lend me some wire to wrap a new coil.

the question is, how do i know how i get the desired ohms? dont know what wire it is but i want around 1-1,5 ohms... so is there anything to go after? or do you guys need to know what wire it is?

 

[Cullin Kin]

With a resistance at 1.0Ω-1.5Ω you will want 26-28 (easier to work with) gauge wire. I would recommend using Steam Engine to play around with the various settings to achieve your desired Ohmage. Coil wrapping | Steam Engine | free vaping calculators

Something to keep in mind, Steam Engine predicts the perfect coil. Humans cannot make the perfect coil and there will always be variance, but it's predictions are super close.

I must ask, what are you using this on? There's a lot of safety concerns with building your own coils and it will benefit you to read Baditude's blogs before anything. E-Cigarette Forum - Baditude - Blogs

Also, you should probably look at some videos online for how to properly rebuild a Subtank head.

 

[Baditude]

You need to know what kind (Kanthal?) and gauge wire it is.

Ohm or resistance is determined by the mass of the wire (gauge) and length of the wire. Also the inner diameter of the coil.

I like using the Toy Coil calculator because it provides a graphic of what the finished coil should look like.

Always measure the coil's resistance on your meter prior to actually firing it. Despite using calculators, final resistance readings may be off in reality.

 

[twgbonehead]

The easiest way:

Put one probe of your multimeter 1 inch from the end of the wire.

Slide the other probe down the wire until the meter reads the resistance you want.

Add an extra inch past the second probe, and cut the wire there.

Then wind your coil, leaving 1-inch legs on either end.

 

[mexin69]

With a resistance at 1.0Ω-1.5Ω you will want 26-28 (easier to work with) gauge wire. I would recommend using Steam Engine to play around with the various settings to achieve your desired Ohmage.

Something to keep in mind, Steam Engine predicts the perfect coil. Humans cannot make the perfect coil and there will always be variance, but it's predictions are super close.

I must ask, what are you using this on? There's a lot of safety concerns with building your own coils and it will benefit you to read Baditude's blogs before anything. ]E-Cigarette Forum - Baditude - Blogs

Also, you should probably look at some videos online for how to properly rebuild a Subtank head.

im gonna build it on the rba section that came with my subtank... have watched some videos and im gonna wrap it around a drill... gonna see tomorrow what wire it is

does the ohm depend on how many reps i do?

 

[Cullin Kin]

im gonna build it on the rba section that came with my subtank... have watched some videos and im gonna wrap it around a drill... gonna see tomorrow what wire it is

does the ohm depend on how many reps i do?

1) Figure out the diameter of the drill bit.

2) Yes, more wraps = more wire = more resistance.

You shouldn't do this unless you have a multi-meter or ohm reader to verify you build is safe.

 

[bwh79]

resistance is determined by the mass of the wire (gauge) and length of the wire.

I mean, technically you're not wrong, since the mass is a factor of the other two values, plus density, but isn't it more correct to say that resistance is determined by the length and cross-sectional area of the wire (directly proportional to the length, and inversely proportional to the cross-sectional area)? The actual mass of the wire is a factor of the volume (length times cross-sectional area) and density, combined.

If "cross-sectional area" is a term too confusing for newbies, you could just say "thickness," instead. When dealing with round wire, these are both directly related to the gauge, and any of those three are more correct than saying "mass," in my opinion.

 

[Cullin Kin]

You need to know what kind (Kanthal?) and gauge wire it is.

Ohm or resistance is determined by the mass of the wire (gauge) and length of the wire. Also the inner diameter of the coil.

I like using the Toy Coil calculator because it provides a graphic of what the finished coil should look like.

Always measure the coil's resistance on your meter prior to actually firing it. Despite using calculators, final resistance readings may be off in reality.

Baditude, I've been meaning to say, it's good to see you back buddy! Hope all is well for you.

I mean, technically you're not wrong, since the mass is a factor of the other two values, plus density, but isn't it more correct to say that resistance is determined by the length and cross-sectional area of the wire (directly proportional to the length, and inversely proportional to the cross-sectional area)? The actual mass of the wire is a factor of the volume (length times cross-sectional area) and density, combined.

If "cross-sectional area" is a term too confusing for newbies, you could just say "thickness," instead. When dealing with round wire, these are both directly related to the gauge, and any of those three are more correct than saying "mass," in my opinion.

How about the material properties of the wire? They certainly have a large influence on its resistance properties. Really though, why does it matter? The just of what Baditude was saying is true.

 

[bwh79]

Really though, why does it matter? The just of what Baditude was saying is true.

Why does it matter? Why does anything matter? How about "in the interest of being more correct than {well, I guess technically, it's not entirely "wrong"}"?

 

[Das Auto]

Use this
Coil wrapping | Steam Engine | free vaping calculators

It's not a Fail Safe, but it will steer you in a safe direction.

 

[jaytex1969]

twgbonehead: Put one probe of your multimeter 1 inch from the end of the wire.

Slide the other probe down the wire until the meter reads the resistance you want.

Add an extra inch past the second probe, and cut the wire there.

Then wind your coil, leaving 1-inch legs on either end.

That adds a dimension of understanding to the coil craft that, as a noob, I find very helpful. Thank you!


I learned something today, from a Bonehead, no doubt...


Jay

 

[twgbonehead]

OK, sorry if I'm being a total noodge, but.

There are all these fancy calculators, etc that can determine the relevant factors. As long as you've put in all the right numbers in the first place. And you're sure you've chosen all the right options. And that your wire is what you think it is, and so on.

But ultimately, whether you're using 30-ga Nichrome, 20-gauge Kanthal, Nickel, Titanium, Monocrystalline Kryptonite, Twisted, braided, MMW, etc. etc. etc, what the hell is wrong with using a meter to measure out the length you need for the ohms you want, and then winding a coil with that length of wire?

Figure out how much wire you need, start winding a coil on the diameter you choose, and stop when you run out of wire (leaving the amount you chose for the legs left over). Simple. Works for pretty much everything. Very little room for error. No computer necessary.

Sorry for the rant.

 

[twgbonehead]

That adds a dimension of understanding to the coil craft that, as a noob, I find very helpful. Thank you!


I learned something today, from a Bonehead, no doubt...


Jay

We both posted at the same time, so pay no attention to my subsequent rant, I'm glad at least somebody gets it!!!

 

[jaytex1969]

As you can tell by my avatar, I, too, am a bonehead.

We boneheads gotta stick together....


Jay

 

[twgbonehead]

As you can tell by my avatar, I, too, am a bonehead.

We boneheads gotta stick together....


Jay

Yeah, Keep Austin Weird!

(Actually, the only thing I find weird about Austin is that it's in TX. Apart from that, it's one hellova cool city!)

 

[mexin69]

thanks for all the answers guyd made a coil toay and it ended up at 2.8 ohm haha... well waiting for my kanger occ coils (1.2 ohm) now soo... maybe gonna give building a new try. gonna order some cotton and wire.

what wire and cotton do you reccomend?

 

[Rsunderl]

thanks for all the answers guyd made a coil toay and it ended up at 2.8 ohm haha... well waiting for my kanger occ coils (1.2 ohm) now soo... maybe gonna give building a new try. gonna order some cotton and wire.

what wire and cotton do you reccomend?

28 Guage A1 Kanthal is a good wire for learning coil building. Most here use Ko Gen Do cotton if they are using cotton, Another choice is to use Rayon.

 

[Baditude]

what wire and cotton do you reccomend?

28 gauge Kanthal is a good starting size...probably the most versatile for both high and lower ohms.

Organic cotton (untreated cotton without hydrogen pyroxide or bleach), Ko Gen Do (Japanese) cotton, cotton bacon, or rayon (cellucotton). Organic is the easiest and cheapest to find. I prefer either cotton bacon, Japanese cotton, or rayon ... in that order.