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Thread: How to build a desired ohm coil

  1. #1
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    How to build a desired ohm coil

    Hi guys,

    I have been trying to build a new coil for iGO-F targeting 1.5-2 ohm. I've got 28 awg kanthal with 2mm silica. Wrap it for 6 rounds 1 side (5 rounds if looking from the other side) and test ohm shows 1.2 ohm. Tried couple of times in same process but still can't get to 1.5 ohm. Is there a way that we can predict ohm from the build?

    Let me reword this: How can I build coil to the desirable resistance? Does it mean wrap more rounds will likely to get more ohm on the coil?

    Cheers
    Last edited by porkchop; 01-10-13 at 02:27 AM.
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  2. #2
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    Quote Originally Posted by porkchop View Post
    Hi guys,

    I have been trying to build a new coil for iGO-F targeting 1.5-2 ohm. I've got 28 awg kanthal with 2mm silica. Wrap it for 6 rounds 1 side (5 rounds if looking from the other side) and test ohm shows 1.2 ohm. Tried couple of times in same process but still can't get to 1.5 ohm. Is there a way that we can predict ohm from the build? Does it mean wrap more rounds will likely to get more ohm on the coil?

    Cheers
    Just get hold of an ohm chart. Also rule of thumb, if 6 wraps (plus tails) gives 1.2 just use slightly more. You get a feel after a while

    http://blog.vapingcobra.com.au/wp-co...nthalGauge.jpg
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  3. #3
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    Quote Originally Posted by porkchop View Post
    Does it mean wrap more rounds will likely to get more ohm on the coil?

    Cheers
    yes

    more length of wire in 1 coil of a particular gauge = higher resistance


    on a related note: 2 coils will normally place them in parallel, so the total resistance is effectively halved of that of one of the coils (if they are both the same resistance).
    Last edited by Cumulonimbus; 01-10-13 at 03:27 AM.
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  4. #4
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    Cheers guys. Need to build more and test them right...study...study.
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  5. #5
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    the most common metaphor for Ohm's law, is that of a pipe filled with water.

    a longer, or narrower pipe means more friction ie. resistance, so it takes more pressure to push the water through the longer or thinner pipe, or rather less water can flow with the same pressure. the pipe is the wire, the water is the current (the pressure is the voltage/potential, but thats less important here for this example). if you use 2 pipes/wires, more water/current can flow, in the same way that using 1 larger gauge pipe/wire will allow more water/current to flow.

    this is a decent metaphor, if quite simplified, perhaps too simplified for AC circuits, but fine for straight DC circuits like we find in most MODs.
    Last edited by Cumulonimbus; 01-10-13 at 04:19 AM.
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  6. #6
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    ... lurkin' and a likin' and a learnin'...

  7. #7
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    Thanks for everyone sharing the info. I rebuilt one with micro coil that came with IGO-F and came out at 1.5 ohm. So hard to turn the micro coil...wish my figures jus as thin as chopsticks so I won't break these micro coils.
    Quit on 10.06.2013
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