Coil Theory

[domesticextremist]

Aug 29, 2012 15:25:45 GMT DiscoDes said:

here's how I do it:

1. Wind a coil 4 turns round a wick.
2. Use a multimeter, one probe on the cut end one probe roughly where you are going to cut, BEFORE cutting this end.
3. Measure resistance with multimeter.
4. if too low add another turn.
5. if too high take off a turn.
6. Cut wire when desired resistance is reached.
7. Sit back smug knowing I didn't even get a CSE pass in maths.





Seriously, nice work, though I did get a little bogged down towards the end, I get number blindness when it gets more complicated than straight addition/multiplication/division though I'm pretty good at percentages after being in Sales for many years.

Gmph! there's always one!

Really, I thought you were a techie type.
At least you're old enough to remember CSEs and O-levels

[beautycat]

#icon_cry# #icon_cry# I was lost at the beginning, but the pictures are nice

[DiscoDes]

Aug 29, 2012 15:49:55 GMT domesticextremist said:

Aug 29, 2012 15:25:45 GMT DiscoDes said:

here's how I do it:

1. Wind a coil 4 turns round a wick.
2. Use a multimeter, one probe on the cut end one probe roughly where you are going to cut, BEFORE cutting this end.
3. Measure resistance with multimeter.
4. if too low add another turn.
5. if too high take off a turn.
6. Cut wire when desired resistance is reached.
7. Sit back smug knowing I didn't even get a CSE pass in maths.





Seriously, nice work, though I did get a little bogged down towards the end, I get number blindness when it gets more complicated than straight addition/multiplication/division though I'm pretty good at percentages after being in Sales for many years.

Gmph! there's always one!

Really, I thought you were a techie type.
At least you're old enough to remember CSEs and O-levels

Well I am a bit Techie, I did a BTech in Electronics but that was a while ago and I have forgotten most of it but I can apply myself if I need to
You've done a great job and if I was turning out loads of coils your equations would be great for me. But all I do is the odd coil now and then and my method works for me as it doesn't matter what resistance the wire is etc, but then again I'm only recoiling Vision Ego's or a cheap Vapor Hut rebuildable. If (when) I get a Penelope perhaps then i'll need to be a bit more measured in my approach.

Seriously though, well done and you obviously have too much time on your hands!


Luv ya really.

[domesticextremist]

you obviously have too much time on your hands!

Nah, I'm just that kind of person
I started thinking about this some weeks ago, only just got around
to figuring it out and posting it here.

[Bluefish]

Or what i'm going to do tomorrow is measure how long a piece of wire i need to get a 2 or 2.5 ohm coil, with the multimeter add a few mm for the joints and cut, hopefully it will be nearer 2 than the 1.3-1.6 i'm getting at the moment >

[gjdart]

Wooooooooooooosh! ....... Right over my head............ :-[

[Perpetua]

Here's how I do it . . . .


First - blunder around looking for specs strong to even vaguely see what I might be doing close up.


Second - rummage through the wick and wire stash and grab some bits that look as if they may be suitable, shiny wire is always very pretty I think.


Third - cobble it all up together . . . doesn't matter if it looks a state, as long as it works right?


Fourth - watch a video to remind myself what I should have done, as I've forgotten since the last time.


Fifth - PM Gordy to ask why I have a leaky.


Sixth - Buy some ready wire.


Seventh - Look at Provari's whilst I'm waiting for delivery of ready wire.


Simples.


Only joking Dom, as always dedication to the deed, with some great pictures.

[timnowvapes]

Brilliant, and excuse to use my Texas out

Although I have made 3 coils now, random making, random number of turns, and length to fit - they all came out at 2.2Ohms I have no specs on the wire I'm using though

So, all you need to do now is factor in:
wick length
absorption rate
e-juice viscosity
end taste result

.............................it is fascinating though how just a random bit of new wick and wire, with no thought process to assembly can produce a brilliant vape compared to pre-bought ones, especially true for the Visions.

[warp]

never did like maths at school,but i did like this,

[Brian]

Great demo.

Trouble i found though..

While i was trying to fathom out what length of wire i needed, my Pizza burnt to a crisp!

[deesigner]

Here's an even easier way. Make a coil, if it doesn't work right, remake it. If it's perfect, uncoil it and then start making a second one to the exact same length of resistance wire (Iatty or ody) then just make a few up to the same length. Hey presto a few weeks worth of coils made!

Sit back, vape away and enjoy a cold glass of Chardonnay (so long as it's not 9am )

[Moon]

Right, with all this clever theory and physics lark going on, hopefully this isn't too simplistic a question, but if I'm a bit rubbish at making coils small enough to fit inside my Vivi heads without touching the sides and shorting, can I double up the length of wire and twist it together, thus making my .2ml wire into .4ml wire and make two coils instead of four to get the same resistance?

In my mind I can't see why this won't work and don't currently have anything to measure resistance so can't try it out for myself.


All advice and/or abuse welcome.

[FirinBlanks]

That sir, is genius.
I'll ignore all of it when I fumble about with my VH Genesis when it turns up later this week, then again that's a mesh so what's the equation for that
I genuinely laughed through that post. That was what you intended wasn't it?

[domesticextremist]

Oct 1, 2012 16:10:24 GMT Moon said:

Right, with all this clever theory and physics lark going on, hopefully this isn't too simplistic a question, but if I'm a bit rubbish at making coils small enough to fit inside my Vivi heads without touching the sides and shorting, can I double up the length of wire and twist it together, thus making my .2ml wire into .4ml wire and make two coils instead of four to get the same resistance?

In my mind I can't see why this won't work and don't currently have anything to measure resistance so can't try it out for myself.


All advice and/or abuse welcome.

Yeah, right, OK.

So the resistance per unit length is inversely proportional to the
cross sectional area of a given wire alloy.
(Or inversely proportional to the square of the diameter for a single wire).

in other words the thicker the wire the longer it needs to be to get a given resistance.

So using two wires twisted together would double the area and halve
the resistance per unit length, so you would need double the length to get
the same resistance coil.

That's assuming they were well twisted together and in good contact along
their length.

However, I don't see how having wire twice as thick and twice as long is going to
help you make your coils any smaller.

[Moon]

Thanks, that's my question answered.

The reason it'd be easier is that there are less gaps between two coils as opposed to four or five, meaning I don't need to be as tidy when I'm wrapping them.

Looks like I'll have to do a bit more practising.