Coil wire guage

[Frenchfry1942]

Okay, I just got a Lemo in the mail and the factory coil looks to be 3mm for an ID with 9 wraps. It shows 1.2 ohms. The guage of wire itself looks (judging) about 28.

I use 28 guage, 1.5 for ID, and 5 wraps and get 1.1 ohms.

The question I have is why such a large coil ID and so many wraps is so close to the same as my usual in ohms? It seems that the factory coil has a lot more surface area and should have a definitely higher resistance than my tiny one.

Why is such a large (factory) coil so close in resistance to my tiny coil?


Thanks for thoughts

 

[State O' Flux]

Okay, I just got a Lemo in the mail and the factory coil looks to be 3mm for an ID with 9 wraps. It shows 1.2 ohms. The guage of wire itself looks (judging) about 28.

Different wire metallurgy can produce a different resistance value, per mm length.

Assuming Kanthal A-1 (using Steam Engine)... it would require 26 gauge wire to obtain the parameters of the factory coil you describe. (106.6mm length of wire)

I use 28 guage, 1.5 for ID, and 5 wraps and get 1.1 ohms.

In addition, your build specifics produce a resistance between 0.6Ω and 0.7Ω.(33.5mm length of wire)

 

[Frenchfry1942]

Thanks, I tinkered some more. The metalurgy was a consideration and I can't validate that one.

 

[edyle]

Okay, I just got a Lemo in the mail and the factory coil looks to be 3mm for an ID with 9 wraps. It shows 1.2 ohms. The guage of wire itself looks (judging) about 28.

I use 28 guage, 1.5 for ID, and 5 wraps and get 1.1 ohms.

The question I have is why such a large coil ID and so many wraps is so close to the same as my usual in ohms? It seems that the factory coil has a lot more surface area and should have a definitely higher resistance than my tiny one.

Why is such a large (factory) coil so close in resistance to my tiny coil?


Thanks for thoughts

maybe it's 27 gauge nichrome
Coil wrapping | Steam Engine | free vaping calculators


if it came from china, i'd expect nichrome

 

[Frenchfry1942]

I am not experienced with Nichrome. Does it have less resistance as compared to KA-1?

 

[SLIPPY_EEL]

yes.................

 

[Frenchfry1942]

Ahhh, that is the deal then.

Thanks Guys