How many wraps with 28gauge Kanthal A-1?

[qfivenine]

I ordered some 28gauge Kanthal A-1 to replace my current 32gauge NiCr wire. Or at least to try out different things. Usually, 5/4 wraps of 32gauge NiCr wire on a "doubled twice" 2mm silica (S-shape) gives me around 2.0 ohms. Let's say I want to have the same or a similar resistance with the 28gauge. How many wraps should I do? Thanks in advance.

 

[JBL-37]

Probably 11 or 12 wraps on a 1/16 bit for that resistance.
FYI, the wire size doubles for every 3 numbers... Example, 29awg would be twice as thick as your 32awg wire.

 

[Jonner]

Depends on the diameter, but I agree that 11 or 12 will get you close, I have a 10 wrap of 28 coming in at 1.4 ohms.

 

[Thunderball]

Just for comparisons sake:

I wrap 28 on a 5/64 drill bit...... perform a 7/6 wrap (7 on top, 6 on bottom) and gives me a 1.1 Ohm Micro coil.

 

[qfivenine]

Thanks everyone for your answers! Do you all use micro coils with 28gauge Kanthal wire? I want to use 2mm silica on a regular coil. Will I still need 11 wraps for that? Also, as the wire length increases (more wraps to achieve resistance), does it take longer to heat up? I want a faster response from my rba, if that's possible!

 

[JBL-37]

I wrap all kinds and sizes of coils, usually never that high in resistance though tbh. It was just a guess to get you close, there are variables that come into play. You really just need to experiment some.

There is a program called the vapors toolbox (forgot about it before). Think it's only for android though but it is pretty handy, I believe a forum member here created it. There is also a google docs floating around with coils sizes and resistance. I just saw it posted and I'll try and track it down. Here

2mm isn't much bigger than 1/16, according to the vapors toolbox you need a 4 3/8 inch piece of 28 awg wire. With 1/8 inch legs you need a 13/12 wrap. With that long of wire and that thick, it will be slow to react.

Good luck and have fun

 

[qfivenine]

Oh, I thought the lower the resistance of the wire, the quicker it will react. I might be better off sticking to 32gauge Kanthal with 5/4 wraps?

 

[spaceman84]

Yes, far less mass to heat up. Thinner wire and shorter length.

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