MICRO COILS - Selecting the right gauge wire to hit your target resistance
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    Default MICRO COILS - Selecting the right gauge wire to hit your target resistance

    When building micro coils, It's important to select the correct wire to hit your target resistance (ohms) when you build a coil

    I like to use 10 or 11 wraps to get my resistance. These days I have a preference of 1.3 to 1.5 ohms.

    This handy chart can take the guesswork out of it for you. Here I rolled up 10 wrap micro coils around the .055" mandrel on the darkzero coil jig using 27, 28, 29 & 30 gauge Kanthal A1. The chart will indicate that 29 gauge is the correct wire for me to use to get the resistance I want in my coil.



    27 ga:


    28 ga:


    29 ga:


    30 ga:


    I made the following notes during this exercise, noting that it's the first time I've ever used 4 different gauges back to back:

    27 ga - the screws tend to loosen up if the coil is even subtly moved.

    29 ga - perfect balance between ease of wrapping and wire thickness. Screws stay nice and tight.

    30 ga - feels extremely thin. The most difficult to wrap a micro coil with. Deforms easily.
    Last edited by super_X_drifter; 01-24-2014 at 07:23 PM.
    dedi, oplholik, Duster6524 and 9 others like this.

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    Micro coil fact sheet:

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    Fine job Super... and a bump - so that your efforts to share practical knowledge doesn't slide off into the twilight zone too soon - from lack of participation.

    PM for you as well.

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    Nice info to know. Thanks for doing the experiment and sharing with us folk
    super_X_drifter likes this.

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    Quote Originally Posted by Papa_Lazarou View Post
    Nice info to know.
    Yes... but will you award him "winner of the internet" - or too soon to tell?

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    Good Work Super! I'd be curious to know how long the Kanthal ended up being stretched out after it was measured, mostly just out of curiosity

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    Quote Originally Posted by propofokgov View Post
    Good Work Super! I'd be curious to know how long the Kanthal ended up being stretched out after it was measured, mostly just out of curiosity
    Thank you

    I threw away those coils. I've never measured the length but may try in the future.

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    Here's another set of resistances taken from micro coils wrapped around a 1.5mm mandrel

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    Quote Originally Posted by propofokgov View Post
    Good Work Super! I'd be curious to know how long the Kanthal ended up being stretched out after it was measured, mostly just out of curiosity
    Excellent idea for those small coils that you can't see to count wraps.
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    My 30g, 7 wrap coils measure .068" long consistently. I measured with a digital caliper at the top of the coil opposite of the tails.
    Now when I wrap, I can just check that instead of squinting, and straining the ole eyes.

    Thanks propo.
    Last edited by oplholik; 02-14-2014 at 03:35 PM.
    Quit Date: 03/2011
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