Determining resistance in twisted kanthal.

[Mrez]

How does one go about doing this? I started playing around with two and three twists 32 gauge kanthal and did 7 wraps around a 1/16 drill bit for my kayfun. I am getting 1.4 ohms. I tried my first dual coil twisted 28 guage kanthal in a tobh Atty because the the straight 28 gauge was loosing its tight coils. I did 6 wraps around a 3/32 drill bit and was thrilled with how sturdy it felt. I put it on the ohm reader and it was coming in much lower then I expected at .35-.4 ohms. I ended up trying it out on my clouper dna 30 and the few puffs I got off it were amazing but it got to hot for the mod and shut down. I would like to target a .6-.8 dual coil twisted kanthal using that 3/32 gauge bit. How do I figure out how many wraps I need. Steam calc didn't really help much on this.

 

[keonee]

This might help you a bit -

http://www.e-cigarette-forum.com/forum/reos-mods/446263-micro-coils-ohms-description.html

 

[readeuler]

Warning: I have not thought about this before, and am very likely wrong.

Short answer: be scientific. I don't know of any good resources on twisting to achieve a given resistance (I bet there are some, but I don't know them).

It seems to me that twisted Kanthal shouldn't be all that different from dual coils: if you have two strands, each of which are 1 ohm's worth of resistance, then in parallel they would provide 0.5 ohms of resistance.

I'm not sure if twisting two strands of Kanthal counts as running them in parallel, but my gut feeling is that it should be pretty close. (EDIT: this is really the speculative part, that twisting resistance wire will act like resistors in parallel)

You'll have to do your own math/experimenting here. If you find that, to get 0.7 ohms of twisted Kanthal you need 1 inch of twisted 32 gauge wire, then you'll have to play around with different wrap diameters to get the desired one inch wrapped in a suitable area.

I suspect that coil toy knows the diameter of your common resistance wires, and can calculate how much length comprises a single wrap, based on wire and inner diameters. Twisted wires wouldn't have as nice of a diameter (it would be very non-circular, unless you're using a fairly large number of strands), hence the need for some experimentation on your part (or copying a build that gives the results you want).

Alright, enough speculation from me.

 

[Sgt.Rock]

Twisted wire can end up at differing ohms per inch depending on how tight you twist (visually shortening the wire)

Best thing? Twist away, when done, lay your finished product (before coiling) on non conductive surface and measure the resistance with a multimeter from end to end...That will give you an idea what you are working with. Also, you can mark a spot near one end with a sharpie and measure from there to whatever distance gets you your desired resistance and place another mark there. Now you have your two mount points for your coil and you will end up in the right ballpark anyway.

 

[Mrez]

Unfortunately I don't have a multimeter, or any idea of how to use one, so I guess its time to break out a pad and pencil and go the old trial and error method. Oh...and get more drip atomizers

 

[iamthevoice]

Using a multimeter is fairly easy; set it to the 200 scale in the Ohm section and touch one lead to the center pin of the 510 and one to the outer ring.

The problem with trial and error in this case is the risk to your hardware and yourself. Why guess when you could know?

 

[Susan~S]

Unfortunately I don't have a multimeter, or any idea of how to use one, so I guess its time to break out a pad and pencil and go the old trial and error method. Oh...and get more drip atomizers

How to Use Your Multimeter

Video on How to Use Your Multimeter

 

[Ryedan]

Unfortunately I don't have a multimeter, or any idea of how to use one, so I guess its time to break out a pad and pencil and go the old trial and error method. Oh...and get more drip atomizers

Building coils and vaping them without a DMM is not something I have ever done. You're using a DNA board, so you should be safe if there is a short, but why take the chance? My first multimeter cost me around $15 with shipping from Amazon and it did a great job for me for a couple of years until I got a better one.

Vape safe Mrez

 

[JMarca]

Unfortunately I don't have a multimeter, or any idea of how to use one, so I guess its time to break out a pad and pencil and go the old trial and error method. Oh...and get more drip atomizers

Trail and error with your face is a pretty big gamble, I'd put it up there with sword throwing and 6 shooter roulette. A multimeter is pretty simple to use and could save you alot of headaches if you miscalculate.

 

[Shootist]

How does one go about doing this? I started playing around with two and three twists 32 gauge kanthal and did 7 wraps around a 1/16 drill bit for my kayfun. I am getting 1.4 ohms. I tried my first dual coil twisted 28 guage kanthal in a tobh Atty because the the straight 28 gauge was loosing its tight coils. I did 6 wraps around a 3/32 drill bit and was thrilled with how sturdy it felt. I put it on the ohm reader and it was coming in much lower then I expected at .35-.4 ohms. I ended up trying it out on my clouper DNA 30 and the few puffs I got off it were amazing but it got to hot for the mod and shut down. I would like to target a .6-.8 dual coil twisted kanthal using that 3/32 gauge bit. How do I figure out how many wraps I need. Steam calc didn't really help much on this.

First off something is wrong with your wrapping. Once 28g is wrapped and torched/squeezed it should not loose its shape or tightness.
I've been using the same coil in my Kayfun for 3-5 weeks with it not loosing its shape or tightness. In those weeks I have changed the wick many times and dry fired it every time I change the wick.

6 wraps of 28g around a 3/32 DB will give you somewhere around .9-1 ohm (+/-). 8 wraps of that size kanthal around a 3/32 DB consistently gives me 1.4 ohms (+/- for the length of the leads wrapped around the screws in a Kayfun). Each wrap, +/-, changes the resistance by about .2 ohms.

So I would up your warps of the twisted 28g to at least 7 possibly 8 for somewhere in the .6 to .8 ohms resistance.

 

[Mrez]

Trail and error with your face is a pretty big gamble, I'd put it up there with sword throwing and 6 shooter roulette. A multimeter is pretty simple to use and could save you alot of headaches if you miscalculate.

I have an ohm reader that I was using for testing for shorts and see what the resistance was in the coil. I didnt mean testing by just throwing on a coil and firing it up without any idea of where the resistance was at or if there was a short in it. I'm thick headed but not that thick headed.

 

[Mrez]

First off something is wrong with your wrapping. Once 28g is wrapped and torched/squeezed it should not loose its shape or tightness.
I've been using the same coil in my Kayfun for 3-5 weeks with it not loosing its shape or tightness. In those weeks I have changed the wick many times and dry fired it every time I change the wick.

6 wraps of 28g around a 3/32 DB will give you somewhere around .9-1 ohm (+/-). 8 wraps of that size kanthal around a 3/32 DB consistently gives me 1.4 ohms (+/- for the length of the leads wrapped around the screws in a Kayfun). Each wrap, +/-, changes the resistance by about .2 ohms.

So I would up your warps of the twisted 28g to at least 7 possibly 8 for somewhere in the .6 to .8 ohms resistance.

I haven't had any problems with building on the kayfun, the issue was when I was loading the coils into the TOBH, at least originally, i didn't have the drill bit through them, so when the legs were threaded through the posts and tightened down they would start to spread out, and I couldn't seem to get them nice and tight again. That was the reason I bought the 3/32 DBs, so I could keep the coils in place a little better.

As of right now, the single twisted coil at 6 wraps is giving me .9 ohms. I have two coils, twisted 28 gauge at 7 wraps around the 3/32 DB for my TOBH atty ready to go when I feel like switching over.