RBA's and selecting the RIGHT WIRE

[mackman]

Super X again a superb effort. Many thanks for the "continuing education" for the members

 

[bushmaster]

Thanks for the continuing education, Super X.
Just thought I'd run this by you. I don't receive the same ohmage as you. Now admittedly, I'm using different equipment--hand-wrapping around an 18 ga. lock needle. With that, I measured 1.3 ohms with 10 wraps of 28 ga. Kanthol. I suspect I don't keep my wraps as tight as I might. coils are touching but perhaps a bit enlarged by the time I'm done. Vapes nice though.
That said, my real question is theoretical: I could acquire the same amount of surface area with the same amount of resistance with less wraps on a larger coil--or maybe I couldn't? My math is a little rusty. I remember Pi--just don't remember how to use it and am too tired and/or lazy to look it up. Or is there another factor at work here? Got to thinking about this tonight and it started nagging on me.

 

[supertrunker]

You might like to fiddle with this if you can't be bothered to do the maths Roger

Helical Coil Calculator

T

 

[bushmaster]

Looks pretty scary, T. Think I'll wait until tomorrow. Thanks.

 

[super_X_drifter]

Thanks for the continuing education, Super X.
Just thought I'd run this by you. I don't receive the same ohmage as you. Now admittedly, I'm using different equipment--hand-wrapping around an 18 ga. lock needle. With that, I measured 1.3 ohms with 10 wraps of 28 ga. Kanthol. I suspect I don't keep my wraps as tight as I might. coils are touching but perhaps a bit enlarged by the time I'm done. Vapes nice though.
That said, my real question is theoretical: I could acquire the same amount of surface area with the same amount of resistance with less wraps on a larger coil--or maybe I couldn't? My math is a little rusty. I remember Pi--just don't remember how to use it and am too tired and/or lazy to look it up. Or is there another factor at work here? Got to thinking about this tonight and it started nagging on me.

Roger, yep different size molds will yield different resistance with the same number of wraps. The smaller the mold the less resistance with the same number or wraps.

Once coils start getting larger than, say, 1/16" I can't get my minimum 10 wraps so I don't wrap larger than 1/16" coils

 

[super_X_drifter]

Fantastic post Supe!

ATM I am running a 7 wrap around 0.055" with 28awg. I love the response time of the 7 wrap vs 10+ it's instant plumage and nice and warm, BUT 7 wraps is on the small side and its very easy to burn the wick if you're not careful.

In my experience, having the same # wraps and same ID and varying the gauge will vary the temperature of the vapor. Warmer vapor (great for tobaccos) with thicker wire, and cooler vapor (great for fruits/menthols) with thinner wire. Are there any other discernable differences in vape production/quality/flavor that you have noticed supe (or anyone)?

Thanks bro

I rarely run less than 10 wraps so I might not be able to accurately answer. I did observe that when I was using 27 ga and like 10 or 11 wraps it took longer for the coil to reach its full warmth. I observed the same today when torching the coiled masses of the different wire.

I have really begun to settle in with the 29 ga cause it's not as springy / thin as 30 and hits the perfect resistance at 10 wraps providing I can accurately count 10 wraps.

I also like that the screws don't auto loosen with 29 ga

 

[photon9]

I love this, it deserves a sticky... any chance of you twisting some different gauge kanthal and wrapping it and adding it? reason i ask is this is extremely useful, but for me and my abundance of 30 gauge, instead of getting 28 gauge, or 29, or 26, or whatever, if i knew twisting 2 strands of 30 i would get similar results to say 28, 3 strands similar to say 26, etc etc... this would make it beyond amazing... this would make it an invaluable source of information!!!

I only have 30g too but I am currently running it twisted.

13 wraps on 5/64ish nail got me 1.48 ohms. So at 10 wraps you should be around 1.1 ohms more or less.

I think twisted might be a little harder to lock in exactly where ohms will be consistently since the resistance will be dependent also on how tightly the wires are twisted, which will vary somewhat person to person and build to build.

 

[Wickeddeuce]

I only have 30g too but I am currently running it twisted.

13 wraps on 5/64ish nail got me 1.48 ohms. So at 10 wraps you should be around 1.1 ohms more or less.

I think twisted might be a little harder to lock in exactly where ohms will be consistently since the resistance will be dependent also on how tightly the wires are twisted, which will vary somewhat person to person and build to build.

this is true and i dont deny that, however, for the most part, the margin that it would vary should only be slight (in a manner of speaking) the other thing to this is that super_x at 10 wraps, on a .055 will end at x ohms, there are other variables, length of the leads, how tight it is, there are many many many various variants, if i understand super_x the purpose of this is to give an idea of the ohms...

btw im proud of you, wasnt it not even a week or two ago you posted built your first coil in the general thread? good job!!!

 

[photon9]

btw im proud of you, wasnt it not even a week or two ago you posted built your first coil in the general thread? good job!!!

Aww thanks! Yeah it was about 2 weeks ago I built my first coil lol, but it's pretty easy... Way easier than rewiring a guitar lol.

 

[thinkingaboutit]

All this thread makes me want to do, is try some 27 or 28

Anyone wanna trade 20 feet of 30 for less feet of 27 or 28? I wanna try it but with a gazillion feet of 30 it's hard to justify. Just did three new coils a minute ago and I get my target pretty easily. Maybe I shouldn't stray from what I like.

 

[Filthy-Beast]

PM me your address and I'll send you a few feet of a bunch of stuff to try.

28ga kanthal and nichrome
30 ga nichrome
.6 x .07 ribbon

I don't have any 27 or 29 ga.

 

[X-Puppy]

If you're not overwhelmed yet here's a good spreadsheet. I can't remember who the credit goes to, I think it was Mama-T
https://docs.google.com/spreadsheet/ccc?key=0AiaRSDxC1vG6dC1HZEtmY0pPYzBvdUw2blJHVjdkc1E&usp=sharing#gid=0

 

[Vash]

Thanks bro

I rarely run less than 10 wraps so I might not be able to accurately answer. I did observe that when I was using 27 ga and like 10 or 11 wraps it took longer for the coil to reach its full warmth. I observed the same today when torching the coiled masses of the different wire.

I have really begun to settle in with the 29 ga cause it's not as springy / thin as 30 and hits the perfect resistance at 10 wraps providing I can accurately count 10 wraps.

I also like that the screws don't auto loosen with 29 ga

I have been thinking about trying out some 29 ga myself.I was thinking same as you that would be easier to wrap than 30 ga but fire up little faster than 28 ga.Thanks for all the info SXD