lets talk oxidization.

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Lance_Wallen

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keep getting either a short or just a massive hotspot on the positive leg. Plus I'm using a DUD and if I cut the wick off at the top of the nuts it gets pushed in by the cap when I screw it on which screws the coil up. I cut it lower and it stopped getting pushed in, but then I'd screwed with the wick so much that it needed to be re burned, at that point I just gave up.

I odn't wanna troubleshoot my ineptitude at rba building with this thing in this thread though. I wanna focus in on wick building and simplifying it with a more direct approach. So far I'm pretty happy with the resistance results I"m getting from just a juice burn. The main trick is making sure the part near the coil is as resistant as possible obviously.
 

Ravenous

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keep getting either a short or just a massive hotspot on the positive leg. Plus I'm using a DUD and if I cut the wick off at the top of the nuts it gets pushed in by the cap when I screw it on which screws the coil up. I cut it lower and it stopped getting pushed in, but then I'd screwed with the wick so much that it needed to be re burned, at that point I just gave up.

I odn't wanna troubleshoot my ineptitude at RBA building with this thing in this thread though. I wanna focus in on wick building and simplifying it with a more direct approach. So far I'm pretty happy with the resistance results I"m getting from just a juice burn. The main trick is making sure the part near the coil is as resistant as possible obviously.

Not to get off topic but have you tried creating your coil first then tightening the top (positive) leg before tightening the bottom (negative) leg? To me it seems that when you are tightening the positive post its pulling your resistence wire into the SS (through the build up) causing conductivity and your hotspot.
 

Boden

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I dunno why you' be worried about whats left behind, any heat activated deposits are going in your lungs already :p

All that said, I just tried to make another coil/wick set up on my DUD and it's still a freakin failure for me. I'm using 36awg nichrome which might be part of my problem. I've got some 32 and 28 kanthal coming in the mail tomorrow.


BIG discovery!!! The resistance difference between the 36awg and the SS Wick is not high enough. The 32 should work better and if you can get enough coils with the 28awg it should be even better.

I love science. We are working on this exact problem here: http://www.e-cigarette-forum.com/fo...vertical-cotton-wick-setup-9.html#post7554446
 
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zoiDman

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Boden

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Are you saying that you are making Lower Resistance Coils or just using Lower Resistance Wire per Foot?

Lower resistance wire per foot. The overall coil resistance does not matter. It's the material resistance that will determine the electrons path.

edit: Well, unless you use a silly number of wraps. Then the distance + resistance will come into play.

edit2: As long as the Watts stays the same the electrons will stay in the lower resistance wire better than the higher resistance wire.
 
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zoiDman

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Lower resistance wire per foot. The overall coil resistance does not matter. It's the material resistance that will determine the electrons path.

edit: Well, unless you use a silly number of wraps. Then the distance + resistance will come into play.

Learn something New Every Day.

All this time I thought Resistance of a Wire was a Function of Material, Length and Diameter.

Kinda like when my Skil Saw runs Slower when I use a 100' Cord Set versus a 10' Cord of the same Gauge.
 

Boden

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Learn something New Every Day.

All this time I thought Resistance of a Wire was a Function of Material, Length and Diameter.

It is. But in this equation there is more than one wire. You have a wire (nichrome), an partial insulating coating (oxides), a gap, another partial insulating coating of a different resistance (different oxides) and yet another metal conductor (SS).

Kinda like when my Skil Saw runs Slower when I use a 100' Cord Set versus a 10' Cord of the same Gauge.

That's because of thermal loss over the 100ft distance. ie voltage drop.

Edit: Say you have two wires almost touching, one is 10ft long with a overall resistance of 200 Ohms the other is 100ft long with a overall resistance of 20 Ohms. The common gap resistance is 500 Ohms. The total amount of resistance including gap resistance not distance determines the % of current that takes each path.
 
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Boden

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Yes, The difference in distance on something the size of a coil at almost the speed of light is inconsequential. The electrons will stay in the lower resistance path even if it is a bit longer.

Think about a lighting rod. It has lower resistance than the water on the outside of a wet house, even though the distance to the ground is longer than down the side of the building, the electricity follows the wire. (mostly ;-) )
 
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zoiDman

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It is. But in this equation there is more than one wire. You have a wire (nichrome), an partial insulating coating (oxides), a gap, another partial insulating coating of a different resistance (different oxides) and yet another metal conductor (SS).



That's because of thermal loss over the 100ft distance. ie voltage drop.

Edit: Say you have two wires almost touching, one is 10ft long with a overall resistance of 200 Ohms the other is 100ft long with a overall resistance of 20 Ohms. The common gap resistance is 500 Ohms. The total amount of resistance including gap resistance not distance determines the % of current that takes each path.

Yes, The difference in distance on something the size of a coil at almost the speed of light is inconsequential. The electrons will stay in the lower resistance path even if it is a bit longer.

Think about a lighting rod. It has lower resistance than the water on the outside of a wet house, even though the distance to the ground is longer than down the side of the building, the electricity follows the wire. (mostly ;-) )

All Good.

But what I would like to know is if the 2 Coils you Made/Tested had the Same Resistance. Not the Resitance of the Wire or the Lenght.

Just if the the Coils had the Same Resistance?
 

Ravenous

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All Good.

But what I would like to know is if the 2 Coils you Made/Tested had the Same Resistance. Not the Resitance of the Wire or the Lenght.

Just if the the Coils had the Same Resistance?

If the two coils, (1) 32 AWG and (1) 36 AWG were the same length then the 36 AWG would have a higher resistance. Therefore to get the two coils to have the same resistance, the 32 AWG wire would need to be longer (more coils).

Best regards,

Derek
 

zoiDman

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If the two coils, (1) 32 AWG and (1) 36 AWG were the same length then the 36 AWG would have a higher resistance. Therefore to get the two coils to have the same resistance, the 32 AWG wire would need to be longer (more coils).

Best regards,

Derek

That's how I Understand it.

What I Didn't Understand was this...

Lower resistance wire per foot. The overall coil resistance does not matter. It's the material resistance that will determine the electrons path.
...

So is Boden saying that if I make 2 Coils, One out of 32awg Wire and One out of 36awg Wire, and they Both have the Same Resistance - say 2.6 Ohms, that one will work Better than the Other because One wire has a Lower Resistance per Foot?

I guess what is Confusing me is the term "overall coil resistance does not matter".
 

BJ43

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Forget all that about how many coils and back to basics, what Boden is saying is that the closer you get with the resistance of the wire (not the coil) to the resistance of the SS the more likely the current will transfer to the ss wick and short. He is not referring to any length or wraps just a physical point.

Quote Boden.
edit2: As long as the Watts stays the same the electrons will stay in the lower resistance wire better than the higher resistance wire.

The oxidzed SS wick has a high resistance but the thinner the wire you use (higher resistance) you start closing the spread between the two and make a possible short easier.
 
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zoiDman

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Forget all that about how many coils and back to basics, what Boden is saying is that the closer you get with the resistance of the wire (not the coil) to the resistance of the SS the more likely the current will transfer to the ss wick and short. He is not referring to any length or wraps just a physical point.

This has been my thinking for a Long Time.

That when I make a coil with a Lower Resistance, say 1.6 ohms, that it should work better with a SS wick than if I make a coil that is say 3.0 ohm and use it with the same SS wick.
 

BJ43

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This has been my thinking for a Long Time.

That when I make a coil with a Lower Resistance, say 1.6 ohms, that it should work better with a SS wick than if I make a coil that is say 3.0 ohm and use it with the same SS wick.

I repeat this has nothing to do with if it is a 1 ohm coil or a 3 ohm coil. It has to do with the resistance of the wire at the point it is next to the SS wick, a high resistance wire like a 38g will short easier than a low resistance wire like a 28g. It is direct relationship between two unequal resistances, the wire and the oxidized SS wick, has nothing to do with how many wraps or ohms the coil is. The higher the difference at any given point, the less likely a short.
A 1.6 ohm 36g coil will short easier than a 1.6 ohm 28g coil on the same oxidized SS wick.
 
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