I thought I was an expert, but this Odin is killing me

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ElConquistador

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I've been building coils for over a year, so I think I'm pretty good at it. The other day, I got my first dual coil atomizer,an Odin bottom feeder to run on my REO Grand mod. I sat down and wrapped a couple of 2 ohm coils out of 30 gauge Kanthal, and got everything all installed and, after fiddling a little, got it going at exactly 1.0 ohm. Super_X_Drifter has uploaded videos of his builds on this rba and mine are done the same way. Just for fun, I tore it down yesterday, thinking I'd give this sub-ohm craze a try to see if I could tell a difference. That's when the fun ended.

I spent hours yesterday fighting this thing. I rebuilt it using 28 gauge wire, two identical coils at about 1.3 ohms each, shooting for a little north of .6 ohms, Yes, I have genuine AW 18650, 1600 mAh batteries, I'm safe!! This is a 3 post atomizer, center post has the hole it in to run the wires through and tighten down. Anyway, I kept getting wild readings on my meter (I have the ubiquitous little black box meter with a 510 connection built in). My readings kept showing up as giant numbers, like 600-700 ohms, which I interpret to mean I have a short. But I don't have a short, I've rebuilt this thing over and over.

I finally noticed that even though the center screw is torqued down as far as I can get it, the wires want to wander around in the post, so I replaced the screw with a longer one. I'm still getting the wild readings. If I fiddle with the coils, the readings bounce around even when everything seems tight, but never drop into the range they should be reading. Pulling out one coil, I get a perfect reading on the other, it's adding that second coil that screws something up. There are no visible shorts, everything is neat and tidy, I know what to look for and there's nothing to see.

I've prodded around in the post to make sure there's no metal in them, I did get a tiny fleck of metal out, but they're clean now. I finally put in on my mod and it fired up, but very unevenly with hot legs. I didn't want to risk anything, so that was all I did. I'm getting the impression my meter isn't capable of sub-ohm readings, but it's the same thing 99% of you use. My digital multi-meter is pretty much worthless when I try it. I'm just assuming this meter will read below 1 ohm, it's capable of reading to 2 decimal points. Does work with my other toppers, batteries are fine in it. It reads 1 when nothing is attached.

Any and all wild guesses as to what I'm doing wrong are appreciated!
 

ElConquistador

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I was leery of firing it if it had a problem, so I didn't give it much adjustment on the battery. I did try running my mandrel through it a time or two, but I wimped out when things didn't even out quickly. I won't trust the thing if I can't get it stabilized, but I'll give it another shot under power and see if it will sort itself out.
 

ElConquistador

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OK, so I just wrapped a 0.6 ohm coil (according to steam engine calculator), 4 wraps of 28 gauge on a 1/16" mandrel. Put it on the atty, and got a reading of 598, so I think tmassey has solved my little riddle. All this time, I've been pulling my hair out, and my coils were probably right on the money every time.

AzPlumber, it appears to be a single post and it's very stable. I was having problems snugging the wires down enough, but I think I've got that solved with the longer screw.

bsidb, I'll pulse the crap out of those hotspots now, once I prove to myself that this meter is, indeed, reading in milliamps! Maybe I was just being overly cautious, but I could live without a venting battery

Thanks for the suggestions, you guys. I should have posted this question yesterday, I would have saved about 2 feet of wire!
 

ElConquistador

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All is well, I guess I'm officially a sub-ohmer now. I'm not so sure I like it, with the airflow wide open, it's pretty hot.

I've never stepped down the nic since switching to RBAs, RDAs, etc. because I've always kept my ohms in the low 1.2-1.5 range. The other night, when I had a 1.0 ohm dual coil running, I had a quick moment of dizzyness, so I put it down. I have a feeling I could vape myself sick with this thing at .6 ohms and 12 mg/ml juice in no time at all.

I'm embarrassed to admit I never knew this meter would switch to milliamps because I've never built a sub-ohm coil. After checking a couple of different coils on it, I verified that that is indeed what's happening, so my targeted .6 ohm dual coil build read out as "597" on the meter. I wasn't going to go to town with this without understanding the numbers, they seemed kind of random to me, especially since they were bouncing around due to the loose connection in the center post.
 

Papa_Lazarou

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Glad you got your metering sorted out.

I'd just like to add that you maybe shouldn't throw the baby out with the bath water - your setup on the odin with duals in that range might not be to your liking (at least at the moment), but that doesn't mean you wouldn't enjoy a different dual subohm build on another atty. I run duals at .5ohm on a RM3 with stock air holes and it's just like a supercharged RM2 - same vape characteristics, just more flavour and vapor.

You've also got things to adjust, which I'm sure you'll get to - coil size and placement, afc, and even just adding a longer dt can cool the vape down. Have fun with your new bad boy subohming self.
 
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