Different ohm readings?

[gakr]

Hello all, New to the board been lurking sometime though! Been vaping since mid June finally put the smokes down after 40 years! This has been my most successful attempt yet!
I do have a question, I jumped right in to rebuilding my coils Kanger pro tank mini 2 and evods. While they do work I get different ohms with each anywhere from 2.0 to 2.75 ish. Kanthal 32 gauge wire 5 wraps on a 1/16th bit used silica and cotton for a wick, anyone know why? Thinking maybe about using some emory cloth on the inside to make sure my ground leg is getting a good connection other than that I have no idea why they fluctuate.Any ideas? Thanks

 

[CreepyLady]

Is the reading different from coil to coil or is the same one coil fluctuating?

 

[K31Scout]

Welcome gakr. I'll be watching this post because I'm getting some Kanthal today to try my hand at my Evods and Pro Tank II's. I think I'll get 30g and 32g to cover the ohm spectrum.

BTW...My Nautilus Mini varies from 1.9 to 2.0 on my MVP

 

[gakr]

different coils, same 5 wraps ,some will be higher than others!

 

[DaveP]

The more wraps, the higher resistance for any gauge Kanthal. You may also have coils touching. Try rubbing your finger lightly across the coils while it's mounted in the atty and measuring the resistance using a digital 510 thread ohmmeter. It's common to wrap a coil that should be 2 ohms and find that it's much lower due to adjacent coils touching.

510 808 Ohm Resistance Reader Meter for Rebuilding RBA Atomizer Coil: Amazon.com: Industrial & Scientific

 

[BiLLi0]

Hello all, New to the board been lurking sometime though! Been vaping since mid June finally put the smokes down after 40 years! This has been my most successful attempt yet!
I do have a question, I jumped right in to rebuilding my coils Kanger pro tank mini 2 and evods. While they do work I get different ohms with each anywhere from 2.0 to 2.75 ish. Kanthal 32 gauge wire 5 wraps on a 1/16th bit used silica and cotton for a wick, anyone know why? Thinking maybe about using some emory cloth on the inside to make sure my ground leg is getting a good connection other than that I have no idea why they fluctuate.Any ideas? Thanks

Do you torch it? Try that and you'll see that they will all be exactly the same. Sometimes the coil changes its position due to pressure or wicks.

 

[wallacecarey]

Hello all, New to the board been lurking sometime though! Been vaping since mid June finally put the smokes down after 40 years! This has been my most successful attempt yet!
I do have a question, I jumped right in to rebuilding my coils Kanger pro tank mini 2 and evods. While they do work I get different ohms with each anywhere from 2.0 to 2.75 ish. Kanthal 32 gauge wire 5 wraps on a 1/16th bit used silica and cotton for a wick, anyone know why? Thinking maybe about using some emory cloth on the inside to make sure my ground leg is getting a good connection other than that I have no idea why they fluctuate.Any ideas? Thanks

Its common to have a coil a little larger even though it was wrapped on the same drill bit or end up with one leg a little longer than the other .75 variance is not bad at all especially on those tiny little coils.

 

[albertoekim]

sub-ohming will drain batteries faster. just saying.

 

[Huh?!]

sub-ohming will drain batteries faster. just saying.

What does that have to do with this thread? No where is there reference to sub-ohming.

 

[gakr]

yep I use that ohm meter! sometimes Ive noticed the tighter you get it, it will change readings as well.
Ive never torched the coil after making it,maybe I will try that next time.
I always try to make sure they don't touch, usually I just pull the legs down till it starts to move the coil then bend and trim, guess I will try to watch that as well.
Thanks for the ideas I was at a loss.

 

[DingerCPA]

I just buzzed out 6 coils this evening. 30g, 1/16th drill bit, 9/8 wraps. Every one of them landed me at 1.9Ω. I leave the drill bit in the coil until I have the whole thing put back together and the leads trimmed. That way, I'm not pulling on the ends and possibly warping the coil. Other thing, are you compressing your coils? If you're leaving space, you may not be consistent?

Just throwing out a 1/2 cent

 

[DaveP]

Sounds like you are doing it right, but getting different readings. How are you checking them? If it's a voltmeter, are you subtracting meter lead resistance? Probe plugs can vary the readings if the connections are tarnished. Twist the meter lead plugs back and forth in the meter plug jacks to clean them, then touch your meter leads together and allow the reading to settle. Subtract that number from the head reading.

If you are using a 510 ohmmeter you should be getting repeatable readings for the same head.

The rubber grommet and center post have to press the wire against the body to make a good connection. Inspect the post and the hole in the body. Look for dark areas where the wires contacted previously. You'll find darkened areas from heat. The rubber grommets also will burn and form tiny cavities over time as you vape and that causes resistance to creep upward.

And lastly, are you winding coils close together or putting space between the coils? Variance from coil to coil will use more wire. If you space one out a bit and wind the next coil tightly compressed, there will be differences in resistance.

 

[tayone415]

sub-ohming will drain batteries faster. just saying.

That is true. But the OP is building 2.0-2.75 Ohms. Soo......?????

 

[tchavei]

The Protank mini and aerotank mini (newest versions) screw on using the ego thread only. This means that the center post of the atty's head is literally pushed / pressed against the center pin.

There are two common scenarios that lead to variations in ohm readings

1. The positive leg wasn't cut short enough so as one tightens down the clearo, the center post starts rotating and since the leg is stuck between the post and the insulator, it will twist the coil making connectings where it shouldn't and eventually short out. Happen to me a few times. This usually translates into lower than expected reading which gets worse as you tight down the atty.

2. The positive post was inserted to far in compressing the insulator leaving a greater distance from post to center pin so that when one screws in the clearo, the center pin doesn't fully rest on the middle post making a bad contact (higher ohm reading)

Hope that helped
Regards
Tony

 

[gakr]

I do use the 510 ohm meter. I wrap the coil around the bit, try to compress them down while still on the bit. After I take it off, I inspect my work none touching and evenly spaced (best I can tell with old eyes!) I then insert my cotton in the coil very carefully and not using to much to distort the coil. Maybe on future builds I will try to leave the coil in bit, install, snip the legs, then see if I can get my cotton threaded in. Yes some of the grommets have hot spots on them and I keep the legs away from them. And I never gave the thought of tightening them to much in the the ohm meter.

There is quite a few variables into this! That's ok though It gives me something else to think about besides wanting a cigarette!!!
And I can live with the ohm variance, they still work just baffles me.
Thanks for all the ideas!

Just a side note. Since the Mrs and I have quit smoking we managed to take 5 friends down this e-cig journey road in the past month! were all quitters!!!

 

[DingerCPA]

There is quite a few variables into this! That's ok though It gives me something else to think about besides wanting a cigarette!!!
And I can live with the ohm variance, they still work just baffles me.
Thanks for all the ideas!

Just a side note. Since the Mrs and I have quit smoking we managed to take 5 friends down this e-cig journey road in the past month! were all quitters!!!

Congrats to you Mr. & Mrs. Gakr I have a couple coils that have been a little wonky on me as well. Worked fine in the a.m., and then couldn't get one to fire on 3 different batteries. Didn't want to push too tightly (will push the contact pin of the battery down too far) For the $0.05 it would cost to rebuild, I'll just make a new one and move on.