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Raise Ω?

Discussion in 'Coil Builds' started by ricks, Apr 5, 2021.

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  1. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    If I remove some of this mesh coil, will it raise the ohms?
    [​IMG]
     
    • Disagree Disagree x 1
  2. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    If you buy a 10 Foot Extension Cord from the 99 Cent store that is about as thick as a Soda Straw, then try to run a Drill Motor with it, Doesn't the Cord get Hot? And the Drill Motor labors to turn at about 1/2 the Speed it Should?

    But if you buy a 10 Foot Cord that has a Bundle of Copper Strands as Big as your Thumb, something you could Jumpstart a Semi with, then the cord Never gets Hot. And the Drill Motor hums along at Full Speed.

    Why?

    Because the 99 Cent Extension Cord has a Higher Resistance. And It's High Resistance is because it has a Smaller Wire
    inside.

    So it sounds like Less Metal (per a given Length) to Conduct Electricity = Higher Resistance. More Metal (for the Same Length) = Lower Resistance.

    And Doesn't that make Sense when you build on an RTA? A Big Fat 22ga Wire Build will have a Very Low Resistance. Whereas a Tiny 32ga Build (of the same Length of Wire) will have a Much Higher Resistance.
     
    • Like Like x 2
  3. UncleJunkle

    UncleJunkle Vaping Master Verified Member ECF Veteran

    Nov 29, 2010
    UDIO, Clown World
    nvm meant for another thread
     
  4. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    This always gets me... I know this and have been making coils for 10 years now but sometimes my old brain just doesn't work like it used to. SuCks getting old.
     
    • Like Like x 2
    • Agree Agree x 2
  5. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    Now to experiment with how much to remove...
     
  6. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
  7. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    Seems like you could Apply some Backyard Engineering to it.

    That picture shows a Mesh with 9 Rows of Holes. And 10 Rows of Metal between the Hole Rows.

    If you remove 1 Row of Metal, then it would be Interesting to see if the Resistance Increased 1/10th of the Resistance of the Mesh before you cut anything?
     
    • Like Like x 1
  8. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    The one I'm trying is .2Ω coil... I want to try for .5Ω... Maybe .4Ω???
     
    • Optimistic Optimistic x 1
  9. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    BTW. You could Simplify things if you just Cut Away some of the Mesh from the Middle. Leaving something that looked like this...

    >-<

    It would be Easier to do that than you Cut and Entire Row out. But then you would have an Area in the Middle of the Mesh that has Higher Resistance than on the Outer Edges. And that would Cause the Mesh to Heat Up more in the Middle.

    ei: A "Hot Spot".
     
  10. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    I'd try taking 3 Rows Out and see what it does.
     
  11. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    What if I remove some from the center?
    DZ5XqMzX0AEigef.jpg
     
    • Creative Creative x 1
  12. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    Only 1 Way to Know for Sure.

    You might just make the "Game Changer" Breakthrough in Mesh Tech everyone has been Waiting for.
     
    • Like Like x 1
  13. Izan

    Izan Vaping Master ECF Veteran

    Jul 1, 2012
    Mallorca, Spain
    IMO, the opposite will occur.
    You would need to ADD to the mesh to raise the resistance from .2Ω.

    If you remove material, the resistance will fall lower.
    ie, 10 wraps of 22AWG Kan @3.5mm is .7Ω, If you remove 5 wraps, the resistance falls to about .3Ω.

    HTH
    I
     
    • Like Like x 1
  14. AngeNZ

    AngeNZ Lunatic ECF Veteran

    Supporting member
    Mar 24, 2018
    New Zealand
    Are you using that atty on an unregulated mod, and is that why you want to raise the resistance?
     
    • Agree Agree x 1
  15. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    But if you Remove Wraps from a Build, aren't you just Shortening the Distance the Electricity has to Travel? Kinda like taking that Extension Cord from the 99 Cent Store and Cutting it in Half.

    Fine if you Only need 5 Feet. But what happens if you want to say with a 10 Cord?
     
    • Like Like x 1
  16. Izan

    Izan Vaping Master ECF Veteran

    Jul 1, 2012
    Mallorca, Spain
    Yes, I agree, it would reduce/lower the resistance.
    OP would like to increase/raise the resistance.

    Cheers
    I
     
  17. zoiDman

    zoiDman My -0^10 = Nothing at All* ECF Veteran

    Supporting member
    Apr 16, 2010
    So-Cal
    All I'm say'n is if you look at this picture below, the Distance from the Two Wires holding the Mesh Doesn't Change.

    [​IMG]

    So if instead of Mesh, if there was a piece of Straight 22ga Wire. And if the OP asked if the 22ga Wire was Replaced by the Same Length 30ga Wire, wouldn't the Resistance Increase?

    Wouldn't we all say it would?
     
    • Like Like x 1
  18. UncleJunkle

    UncleJunkle Vaping Master Verified Member ECF Veteran

    Nov 29, 2010
    UDIO, Clown World
    2 str8 pieces of wire

    1) 30mm of 30AWG KA1
    2) 30mm of 26AWG KA1

    #1 will have a higher resistance

    So I would think that if you remove material from a mesh "coil" it would increase resistance.

    But I could be wrong. Maybe with mesh it's different? I do have some mesh that I could test this on, but I don't feel like trying to find it. :p
     
    • Like Like x 1
  19. Izan

    Izan Vaping Master ECF Veteran

    Jul 1, 2012
    Mallorca, Spain
    Good example, Thank you.

    30mm of 26AWG VS 15mm of 26AWG.

    The mesh is not getting less dense, so not changing from 26AWG to 30AWG, just now containing less 26AWG material.
    Another coil/mesh strip added in series would increase resistance.

    Cheers
    I
     
  20. ricks

    ricks Vaping Master Verified Member ECF Veteran

    Jan 11, 2011
    Moscow PA
    Regulated
     

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