PT Coil Rebuilds -- Help!!!

[Glenn_K]

Greetings; I've been trying to rebuild PT coils (for my Davide) for the last couple weeks, and not having a great time of it. I've watched and read all sorts of rebuild video tutorials, I have the spreadsheets and calculators showing how many wraps are needed for a particular coil diameter and wire gauge for my given Ohms target. I have an ok set of tools.

My problem, in a nutshell, is that I hardly ever end up with a coil greater than 1 Ohm, no matter how I try to build. For instance, I was following this method this morning -- http://www.e-cigarette-forum.com/forum/tips-tricks/463771-protank-cotton-rebuild-way-i-do.html

I used 32 gauge Kanthol on a 5/64ths drill bit, 5/4 wraps just like it's shown, but where the guy in the tutorial ends up with 1.8 Ohms, mine are coming out at around .5 - .7 Ohms.

Can anyone offer any suggestions? I want to be able to hit resistance targets in the 1.8 - 2.2 Ohms range before I even think about giving sub-ohm stuff a go.

Regards
Glenn

 

[Glenn_K]

Nobody?

I have a hunch that i'm getting wonky results because my DIY coils are touching the cup (the base of the coil). Using the method shown in the link above, I just completed a coil that came out to 1.6 Ohms, which is in the ballpark for me. It was 1.1 Ohms when I tested it the first time, but then I reinserted the drill bit, and pulled the coil up by .5 mm - 1 mm, and that's what brought the resistance up to 1.6 Ohms. I think the coil ended up high enough to not contact the cup, but not so high that it shorted out when I put on the chimney.

Does anyone have good advice about getting the right coil height above the base? I don't want to make a habit of having to the the readjustment as just described, I'd like to be able to get it right the first time.

-- Glenn

 

[Alter]

I'd be checking that you might be using 32mm kanthal instead of the 32 gauge. I made that mistake buying from a canadian vendor thinking it was 32 guage and it turned out to be 32mm wire inwhich as you see in the chart is the 28 gauge equivalent.

 

[Glenn_K]

I'd be checking that you might be using 32mm kanthal instead of the 32 gauge. I made that mistake buying from a canadian vendor thinking it was 32 guage and it turned out to be 32mm wire inwhich as you see in the chart is the 28 gauge equivalent.

Thanks for the rely AlterUrEgo, this makes total sense.

I use one of the spreadsheets that shows the expected resistances for various lengths of a given wire gauge. If i'm using 28 gauge when I thought I was using 32 gauge, that totally explains why my coils have fewer Ohms than expected. The chart in your post helps a lot.

-- Glenn

 

[Glenn_K]

Got some real 32 gauge kanthal in a package received today, and the first coil I did was 2.3 Ohms. Much simpler working with this gauge, it's a lot thinner than the 28 gauge I previously used.

-- Glenn

 

[Alter]

I am beginning to perfer 30 guage kanthal, you get your 2.3 out of 6 wraps of 32 i'm assuming. You get more wick coverage with the 30 guage with 8 wraps to get @ 2.2 ohms and you can space them tight enough to still get a good vape without going into a microcoil. I liked the microcoils but they were juice hogs so I reverted back to just the regular coils.
I should mention that its protanks I rebuild.

 

[classwife]

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