Been getting alot of 'shorts' when trying to build dual coils

[alicewonderland]

anyone know the culprit of this? ive built it on 4hole design atomizers, 3 post atomizers, and i dont see how im getting shorts. I take one coil out , the other works fine, i swap em out and the other coil works fine as well, but then when i put them on together i get a short, i check to make sure the leads arent poking through to hit the coil on the other side, i make sure the leads are connected solidly to the posts, but i keep getting shorts, on different rda's not just one. I use a DNA30 device ATM and the display reads "shorted" not "check atomizer", I have no clue what is going on.

 

[readeuler]

If I put anything below 0.5 ohms on my VTR, it reads "0.0". Perhaps you're just building below what the DNA30 considers a short? I believe it fires down to 0.5, perhaps below a certain threshold it just won't read resistance, and assume you have a short?

What resistance are you aiming for/what is the build you're using? Wire gauge, number of wraps, ID, etc?

 

[Papa_Lazarou]

Yes, more info would be helpful as would a pic or two.

 

[alicewonderland]

it could possibly be that, but my dna40 device still fires 0.4ohm single coils without blinking. ive had two separate 1.0 ohm coils and when i connect them both they short. usually when something is too low ohms it shows up on the display but just blinks but will still fire. Im mainly using 24gauge btw if anyone could suggest any builds to try out.

 

[dutch onsea]

Nope, the DNA blinks when it can't reach the wattage that you dialed in (stepdown) but it will still fire. I doubt your DNA will fire at 0.4 but why would you try that? Just add a couple of wraps to each of your coils(or even double the wraps) and then you should be perfect

 

[Flavored]

DNA 30 specs show 0.5 ohms as the minimum coil resistance. I'm betting with your wire size you're below that.

 

[alicewonderland]

Nope, the DNA blinks when it can't reach the wattage that you dialed in (stepdown) but it will still fire. I doubt your DNA will fire at 0.4 but why would you try that? Just add a couple of wraps to each of your coils(or even double the wraps) and then you should be perfect

it fires a coil i build at 0.4, but after scrunching it, they usually turn out around 0.6. the main thing i was getting at is the readout would blink if it got lower and show the ohms, its just showing shorts for me. what im thinking is maybe im using too thick gauge wire, and in the center posts both leads are getting screwed up in the tiny hole. But when i try to dual coil my cigreen-X with a two hole center block post on it, one lead in each hole. i still get shorts for some reason. ive tried 5 wrap 24 gauge dual coil, and 8 wrap 24 gauge dual coil. not sure what is going on.

 

[readeuler]

it fires a coil i build at 0.4, but after scrunching it, they usually turn out around 0.6. the main thing i was getting at is the readout would blink if it got lower and show the ohms, its just showing shorts for me. what im thinking is maybe im using too thick gauge wire, and in the center posts both leads are getting screwed up in the tiny hole. But when i try to dual coil my cigreen-X with a two hole center block post on it, one lead in each hole. i still get shorts for some reason. ive tried 5 wrap 24 gauge dual coil, and 8 wrap 24 gauge dual coil. not sure what is going on.

Just one missing piece of the puzzle: What is the diameter of what you're wrapping on?

If it's 1.6mm, you'd need 16 (yes, 16!) wraps to hit 0.5 dual 24ga coils.
If it's 2.0mm, you'd need 14 (yep, still 14!) wraps to hit 0.5, and finally,
if it's 3.0mm, you'd need 11 wraps.

So... I'm guessing that your coils are just too low for the DNA30. I think you'd do better with 28ga, possibly 26 (Around 1.6, 2.0, and 3.0mm mandrels, you'd need 11, 9.5, and 7 wraps respectively, to hit the 0.5ohm minimum. Kind of iffy, but they might work perfectly well, I don't know)

I believe that a coil rises in resistance after dry-firing, because it develops a layer of oxidation - current can no longer travel between wraps of the coil, and has to take the full intended course.

 

[planes]

Are your leads coming from the same side of the coil. If you have one that's under looped to the center and another over looped to the center, "I think" that could be a problem.