Building coils
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Kanthal A1 Wire resistance Chart
This chart is for A1 type of Kanthal wire per inch, other grades are different.
30 awg (Ω/in) 0.7 ohms
31 awg (Ω/in) 0.9 ohms
32 awg (Ω/in) 1.2 ohms
33 awg (Ω/in) 1.4 ohms
34 awg (Ω/in) 1.8 ohms
35 awg (Ω/in) 2.3 ohms
36 awg (Ω/in) 2.9 ohms
The lower the ohms per inch, the more wraps you will need, this can be a trade off as the thinner wire needs less wraps but also has less surface contact to the liquid. Optimal seems to be 32 for most people.
i should also note that a sharp bend or kink will increase resistance.
This chart is for A1 type of Kanthal wire per inch, other grades are different.
30 awg (Ω/in) 0.7 ohms
31 awg (Ω/in) 0.9 ohms
32 awg (Ω/in) 1.2 ohms
33 awg (Ω/in) 1.4 ohms
34 awg (Ω/in) 1.8 ohms
35 awg (Ω/in) 2.3 ohms
36 awg (Ω/in) 2.9 ohms
The lower the ohms per inch, the more wraps you will need, this can be a trade off as the thinner wire needs less wraps but also has less surface contact to the liquid. Optimal seems to be 32 for most people.
i should also note that a sharp bend or kink will increase resistance.
Greetings; In the following video tutorial, the presenter uses 34 awg with 6 wraps to aim for 2.4 to 2.8 ohms. This is rebuilding a PT coil.
Kanger Protank Bottom Coil Rebuild HD Close Up - YouTube
Sounds like this is not an exact science, but I would guess that you get more accurate with practise, in terms of hitting a certain resistance. I just got my first packages of wire and wicks, and i'll probably try my first DIY coil today.
Regards
Glenn
Kanger Protank Bottom Coil Rebuild HD Close Up - YouTube
Sounds like this is not an exact science, but I would guess that you get more accurate with practise, in terms of hitting a certain resistance. I just got my first packages of wire and wicks, and i'll probably try my first DIY coil today.
Regards
Glenn
Discount vapers has a chart for resistance per inch by gauge: Kanthal A1 Wire resistance Chart
Using the chart above, for example, 30 gauge wiring is .7 Ohms/inch. 3 inches of 30 gauge would give you about 2.1 Ohm coils. 3.5 inches would give you about 2.45 Ohms on 30 gauge. So, the answer is 3 - 3.5 inches of 30 gauge kanthal to hit your targeted resistance. Cut the 3 - 3.5 inches, wrap your coil and make your connections. Obviously, you will need longer wire that when connected is 3 - 3.5 inches long. Taste your juice also has a resistance wire calculator:
http:/..................../wordpress/2013/06/17/resistance-wire-calculator/
Good luck.
Using the chart above, for example, 30 gauge wiring is .7 Ohms/inch. 3 inches of 30 gauge would give you about 2.1 Ohm coils. 3.5 inches would give you about 2.45 Ohms on 30 gauge. So, the answer is 3 - 3.5 inches of 30 gauge kanthal to hit your targeted resistance. Cut the 3 - 3.5 inches, wrap your coil and make your connections. Obviously, you will need longer wire that when connected is 3 - 3.5 inches long. Taste your juice also has a resistance wire calculator:
http:/..................../wordpress/2013/06/17/resistance-wire-calculator/
Good luck.
It depends on what size diameter you are wrapping your coils. Are you doing micro coils or just freehand wrapping around silica? Once you've done a few builds, one quickly learns how to closely achieve the desired ohm build they are looking for. As long as your wraps and diameter are consistent, then it's just a matter of wrapping more or less loops to get the ohms you want. Do you have an ohm meter or a device to measure your build? If not, get one, tis a necessary tool for any builder.
The other thing is that the gauge of the wire impacts the heat distribution, like mentioned above, and thicker wire needs more coils. So you end up spreading your XX watts across more area. That can result in LESS performance for the coil as the heat is not as concentrated.
So, what happens next is that people up the voltage/wattage to compensate. Then they run into an amp limit on their device.
Basically, the thicker the wire, the more watts you're going to need to effectively heat it. The stock coils (about 34 ga wire) run great at, say, 7 watts. But the 30 ga wire and 28 (some use 26) need a lot more watts...26 ga wire would need about double the wattage or more, for example. That's why people using coat-hanger sized kanthal for coils (
) use mechs and push all the limits and run at 20 watts.
30 ga wire is fine. I'm running it right now in an RBA. But the ohms I'm using are about 1.8/1.9 and the voltage is around 5 v. That's 13.2 ish watts.
So, what happens next is that people up the voltage/wattage to compensate. Then they run into an amp limit on their device.
Basically, the thicker the wire, the more watts you're going to need to effectively heat it. The stock coils (about 34 ga wire) run great at, say, 7 watts. But the 30 ga wire and 28 (some use 26) need a lot more watts...26 ga wire would need about double the wattage or more, for example. That's why people using coat-hanger sized kanthal for coils (
) use mechs and push all the limits and run at 20 watts.30 ga wire is fine. I'm running it right now in an RBA. But the ohms I'm using are about 1.8/1.9 and the voltage is around 5 v. That's 13.2 ish watts.
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Thanks all you wrapper rappers. Good info. The diameter thing mentioned above by dice57 is critical. Thanks...
I got it down finally for my attys. made a big differerence in my vaping experience. All my coils come in to within a few tenths of an ohm now. Get an ohm meter..they are inexpensive and with a little experimenting will get you where you want to be.
Hoot
edit...
i guess I should add what my builds are..pretty simple but effective.
i am a big Kanger fan and promote there BCCs whenever I get a chance.
.. mainly use the T3S for every day vaping...and a cheap single coil rebuidable dripper at home...sometimes.
Ive got rebuilding these down to a science...for me that is.
I use cotton wick exclusivley now...guess I should make a video on this...simple but hard to explain with words.
will link when I get it done.
I got it down finally for my attys. made a big differerence in my vaping experience. All my coils come in to within a few tenths of an ohm now. Get an ohm meter..they are inexpensive and with a little experimenting will get you where you want to be.
Hoot
edit...
i guess I should add what my builds are..pretty simple but effective.
i am a big Kanger fan and promote there BCCs whenever I get a chance.
.. mainly use the T3S for every day vaping...and a cheap single coil rebuidable dripper at home...sometimes.
Ive got rebuilding these down to a science...for me that is.
I use cotton wick exclusivley now...guess I should make a video on this...simple but hard to explain with words.
will link when I get it done.
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I tried my hand at building a micro-coil for my ProTanks last week. I read quite a few threads and looked at several youtube videos. I LOVE the micro-coil with cotton! My initial goal was just to save money buying coils, but I have found I like this so much better than the original coils. I can use higher wattages with this build that would burn the ejuice with the original coils. And the flavor!
I ended up building my coils like Rip Tripper shows in this video, Mini Protank Micro Coil Rebuild - YouTube.
For me, there was a learning curve. I have no idea how he is holding the coil with his fingers when he inserts the insulator. My fingers are much smaller than his, and this didn't work for me. I had to do several things a little different that I found through tips on this forum.
It was a learning curve. My first 2 coils were utter flops as I tried to figured out what worked for me. So far I have built 4 coils. 3 were 1.9 ohm and 1 was 2.0 ohm.
-12 wraps of 28 awg Kanthal wire on a 5/16" drill bit. Even with reading glasses it's really hard to see the coils.
-Slide off the coils and pinch together with needle nose pliers.
-Fire the coils with a chefs torch, the slide off. At this point my coils aren't quite perfect. I slide it back on the drill bit to get the coils into alignment, then slide off, pinch with pliers and repeat torching the coils. This may take me a couple of repeats to get the coils into perfect alignment. I also straighten the legs of the coils right after I have torched. It's easier when the wire is still warm.
-I have a really small screwdriver from a glasses repair kit. I slide this through the coils to position them in the cup. The screwdriver sits right in the slots. I keep the coils on the screwdriver until I have reinserted the insulator and pin and clipped the wires. I then make any adjustments to the coil position with the tip of the screwdriver, but the position is pretty close to perfect at this point.
I ended up building my coils like Rip Tripper shows in this video, Mini Protank Micro Coil Rebuild - YouTube.
For me, there was a learning curve. I have no idea how he is holding the coil with his fingers when he inserts the insulator. My fingers are much smaller than his, and this didn't work for me. I had to do several things a little different that I found through tips on this forum.
It was a learning curve. My first 2 coils were utter flops as I tried to figured out what worked for me. So far I have built 4 coils. 3 were 1.9 ohm and 1 was 2.0 ohm.
-12 wraps of 28 awg Kanthal wire on a 5/16" drill bit. Even with reading glasses it's really hard to see the coils.
-Slide off the coils and pinch together with needle nose pliers.
-Fire the coils with a chefs torch, the slide off. At this point my coils aren't quite perfect. I slide it back on the drill bit to get the coils into alignment, then slide off, pinch with pliers and repeat torching the coils. This may take me a couple of repeats to get the coils into perfect alignment. I also straighten the legs of the coils right after I have torched. It's easier when the wire is still warm.
-I have a really small screwdriver from a glasses repair kit. I slide this through the coils to position them in the cup. The screwdriver sits right in the slots. I keep the coils on the screwdriver until I have reinserted the insulator and pin and clipped the wires. I then make any adjustments to the coil position with the tip of the screwdriver, but the position is pretty close to perfect at this point.
I've been doing cotton rebuilds to my Protank using 5 wraps of 32 gauige on a 4-40 screw which has be coming out to 2.2 ohms but my resistance wire runs a little higher than real Kanthal A-1. It's a good idea to measure the actual resistance of the wire you bought since there are variations by different manufacturers. Calling all resistance wire Kantahl is like saying all tissue is Kleenex.
I use 30 guage with 12/13 wraps around a dripper bottle needle. It makes a perfect 1.9 ohm coil.
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Sent from my DROID RAZR using Tapatalk 2
I tried building again no luck 1.0 ohms or lower using 5 to 6 wraps with the 30 gauge. I ordered some 32 and 34 gauge wire to see what happens. I haven't tried to build my oddy yet my NR wire has not got here yet. still trying to build this protank.
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