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Discussion in 'Rebuildable Atomizer Systems' started by superhours, Aug 15, 2014.

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  1. superhours

    superhours Full Member

    Does anyone have any tips for rebuilding? I'm currently building a dual coil on the fogger v4.1 and I can't seem to get it to around the 1 or subs. My coils aren't as tight as everyone else I see either. What are the basics of building coils? I can't seem to find any video that shows/explains how building these coils work. I am grateful for any tips.
    IMG_0154.jpg IMG_0155.jpg
  2. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

    Jul 17, 2013
    Without any specific information about your wire and build... help will be difficult. For example, how are you measuring resistance?

    An example build would be as follows: 28 gauge - 10/9 wrap on 2mm mandrel - 2mm legs = 1.4Ω per coil... or 0.7Ω if installed as dual coils in parallel.
    If the legs are longer... say 3.5mm, then to get the same resistance, it would end up being a 9/8 wrap.
    The length of wire - at 78.2mm contact to contact - doesn't change... but more leg means fewer coils.

    Click on both my sig line hyperlinks... there's information there that will help you tremendously.

  3. superhours

    superhours Full Member

    I'm actually quite new to RBA and not too knowledgeable about this topic. I'm trying to achieve a 0.7ohm resistance with dual coils since the fogger only allows for dual coils. I'm thinking of using 24G kanthals for this..would that be a good idea? I believe mech mods are in "series" circuit therefore the resistance should add up which is why I think I should be using 24G Kanthal, but I could be wrong. Please input on this.
    I was using a wrap the coils but I'm not exactly sure what the size is. It just looked small enough to fit the building deck.
    I don't exactly understand what you mean by legs. Could you please elaborate?
  4. iamthevoice

    iamthevoice Super Member ECF Veteran

    Jul 9, 2014
    Ottawa, Canada
    The legs would be the straight bits sticking out of the coil on each side.
  5. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

    Jul 17, 2013
    There's a lot you don't know... and a lot you need to learn. You'll need to ask one question at a time... because I think you might be getting several things confused. Read the links I offered. ;-)
  6. UncleChuck

    UncleChuck Ultra Member Verified Member ECF Veteran

    Apr 20, 2011
    Late to the party/please delete
  7. Maurice Pudlo

    Maurice Pudlo Ultra Member Verified Member ECF Veteran

    Nov 27, 2013
    United States
    Dual coils in series: (+)—////–////—(-)
    Dual coils parallel: (-)—////—(+)—////—(-)

    Use the calculator, place on an ohm reader in a fully assembled state to check ohms prior to firing, correct any build errors that don't come reasonably close to calculated expectations prior to firing. Use the calculator to check if your battery is capable of firing the coil you built with a margins of safety remain (20% is very reasonable, 1% is not). Do not use a build that does not return a stable reading on the ohms reader.

    Read a metric boatload on this forum, the advice and help is simply amazing.

  8. superhours

    superhours Full Member

    Okay okay so I'm kind of playing around with the coil wrapping calculator and I think I kind of figured a little bit out.
    The length and thickness of the wires affect the resistance. Thicker and longer = more resistance. Thinner/shorter = less resistance.
    I'm still not sure how to do the math to get .7 ohms from two 1.4 ohm wires.
    I'm thinking the equation is R=1(1/x + 1/x) (remembered it from Physics, so long ago lol)
    Also seem like the bigger the diameter, the less the coils but would it be same to assume that the length of the wire when stretched out is still the same?
    I also have questions on techniques on how to properly wrap the wire. Anything I should know?
  9. Susan~S

    Susan~S ECF Guru Verified Member ECF Veteran

    Mar 12, 2014
    Mpls/St.Paul, MN
    Not sure what you are asking. Could you clarify?

    Check out this blog post from Baditude. There are many links including video links on wrapping coils towards the bottom of the post: Information Resources for Your First RBA
  10. UncleChuck

    UncleChuck Ultra Member Verified Member ECF Veteran

    Apr 20, 2011
    Almost there:

    Thicker wire = Less Resistance
    Shorter wire = Less Resistance

    Thinner wire = more resistance
    Longer wire = more resistance

    The math for a dual coil is pretty easy assuming the resistance of the two coils match. Just take whatever TOTAL resistance level you want to achieve, and double it, that's the required resistance of EACH coil. In your case you said you want a total resistance of .7, so if you double .7 you get 1.4 ohm, the required resistance of each coil.
  11. Maurice Pudlo

    Maurice Pudlo Ultra Member Verified Member ECF Veteran

    Nov 27, 2013
    United States
    On the Fogger parallel dual coils look like this:
    (-) (+)

    You can cut and paste this link into your browser for another video.

  12. superhours

    superhours Full Member

    Thanks for all your help! I'm ordering wires right now. I'll update when I get them and using this new knowledge, do a build and see how it goes.
  13. superhours

    superhours Full Member

    Just reporting in here, I got the coils to work! 2mm diameter at 7/8 wraps for .57 or so, fluctuation of course. Don't know what's up with the tank though. It keeps leaking and gurgling. Others don't seem to have this problem. Maybe mine is just defective.
  14. Hoopie

    Hoopie Senior Member Verified Member ECF Veteran

    If your ohm reading is fluctuating on the same meter, check your deck screws and if your coils are clear of touching the deck/posts/etc.

    I can't say why it's leaking and gurgling but it most likely is your wicking. You could watch this video and see if it helps.
  15. TornadoAlley

    TornadoAlley Senior Member Verified Member

    Aug 19, 2014
    You most likely have it wicked improperly. Let me dig up the vid of how I wick it. Also, make sure you have a tiny o-ring on the top piece of the chimney.
    Edit; The video above is how I wick mine, also read up on battery safety so you don't hurt anyone including yourself!!
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