Resistance Wire for RM2

[NicoHolic]

Did this for myself, so I thought I'd share it here. Using specs from TEMPCo
and my favorite 8/7 wrap 0.5Ω micro coil as a baseline for calculations:

     Resistance Wire for Reomizer 2

AWG  Diameter  Kanthal A1   Nichrome 60
32   0.0080"   13.10Ω/ft    10.55Ω/ft
31   0.0089"   10.60Ω/ft    
30   0.0100"    8.36Ω/ft     6.68Ω/ft
29   0.0113"    6.55Ω/ft
28   0.0126"    5.27Ω/ft     4.21Ω/ft
27   0.0142"    4.15Ω/ft
26   0.0159"    3.31Ω/ft     2.67Ω/ft

Source: TEMCo website

An 8/7 wrap micro coil on a Reomizer 2:
26 AWG Nichrome 60 = 0.5Ω @ 0.1272" wide
based on the above:
26 AWG Kanthal A1  = 0.6Ω @ 0.1272" wide
27 AWG Kanthal A1  = 0.8Ω @ 0.1136" wide
28 AWG Nichrome 60 = 0.8Ω @ 0.1008" wide
28 AWG Kanthal A1  = 1.0Ω @ 0.1008" wide
29 AWG Kanthal A1  = 1.2Ω @ 0.0904" wide
30 AWG Nichrome 60 = 1.3Ω @ 0.0800" wide
30 AWG Kanthal A1  = 1.6Ω @ 0.0800" wide
31 AWG Kanthal A1  = 2.0Ω @ 0.0712" wide
32 AWG Nichrome 60 = 2.0Ω @ 0.0640" wide
32 AWG Kanthal A1  = 2.5Ω @ 0.0640" wide

Different leg length could vary these ± 0.1Ω due to rounding.

Let me know if you find any errors and I'll correct them.

I'd torch any of these first with a $4 Ronson Jetlite Torch butane lighter.
Burns off nasty tasting machining oil and makes it easier to work with.

IMHO, I wouldn't use anything thinner than 30AWG on a mechanical REO YMMV
edit to add: (fewer wraps of thinner wire = less wire to wick contact area)

 

[ancient puffer]

Good stuff to know. I find it even better to know resistance per inch, so I calculated (and rounded) from the above, for the Kanthal A1:


Gauge Resistance
Ohms/in. (calculated from above)

16 = .03
26 = .28
27 = .35
28 = .44
29 = .55
30 = .70
32 = 1.09
33 = 1.38
34 = 1.76

Thanks for posting this, NicoHog

 

[Mudflap]

I've been using rba's for over a year and have built dozens of coils and I have no clue what an 8/7 wrap means.

I see folks posting about 3/4 wraps, 4/5 wraps, etc. Does not compute.

My simple brain tells me 3 wraps is 3 wraps. 4 wraps is 4 wraps. 5 wraps is 5 wraps. etc.

If the wire makes it most of the way around the wick before it doglegs off to attach to the post, I count it as a wrap.

Wrap.

 

[Raynman]

Thank you both! I'll be needing this in the next few days.

 

[ancient puffer]

I've been using RBA's for over a year and have built dozens of coils and I have no clue what an 8/7 wrap means.

I see folks posting about 3/4 wraps, 4/5 wraps, etc. Does not compute.

My simple brain tells me 3 wraps is 3 wraps. 4 wraps is 4 wraps. 5 wraps is 5 wraps. etc.

If the wire makes it most of the way around the wick before it doglegs off to attach to the post, I count it as a wrap.

Wrap.

I *think* they mean (e.g., 3/4 wraps) is 3 *full* wraps, with a part of one (the 4th) coming back around to the opposite side from where you started. Sorta like 3/4 is really 3 1/2 wraps.

Somebody please tell me if I'm wrong.

ETA: Ok, I guess I was wrong LOL

I'm so confused now, I don't know WHAT it means, I always view mine from the top and just count how many times I loop the wire around the center, then bring it around to the start side. *sticks index finger into cheek, with thumb up, and twists back and forth*

 

[Raynman]

I've been using RBA's for over a year and have built dozens of coils and I have no clue what an 8/7 wrap means.

I see folks posting about 3/4 wraps, 4/5 wraps, etc. Does not compute.

My simple brain tells me 3 wraps is 3 wraps. 4 wraps is 4 wraps. 5 wraps is 5 wraps. etc.

If the wire makes it most of the way around the wick before it doglegs off to attach to the post, I count it as a wrap.

Wrap.

They call it that because there are 7 coils on the front side but when viewed from the back it looks like 8.

Edit Dang I'm slow. Let me rephrase that. Yeah what A.P. said!

 

[Mudflap]

So we live in a world where people are interested in how many wraps my coil appears to have depending on the angle from which it's being viewed?

You guys are nuts. I'm gonna go buy some cigars.

 

[NicoHolic]

Just use the higher number (8) and count that on the coils 180º from the legs (which typically don't wrap all the way around).

Fuente Fuente Opus X? Padron Annys? Hemingways?

 

[ancient puffer]

Okay folks, let's make this simple. I don't have a clue what 3/4 wrap means. What I do is, knowing the resistance of my wire per inch, whack off the correct length, plus an inch (to allow for what's cut off after installing), and wrap until I have legs about 3/4 of an inch. Then shove them thru the holes, with a bit of a leg on the coil side to allow for adjustment of position.

In my case, I use 30ga Kanthal A1, which is .7 ohms per inch. So I use a piece 4 inches long (3 inches=2.1 ohms, plus 1 inch for cut off) and get right around 2 ohms everytime time. If I want 1.5 ohm, I shorten it by 1/2 inch or thereabouts.

Edited to add: I find I can't really tell a difference of .1 ohm. It has to be at least .3 or .4 for me to see a difference.

 

[Raynman]

I prefer Maduro wrapped Frisco's. Actually I preferred them. Pre-embargo Cubans aren't too bad either. Had one a few years back from my brother for my Birthday.

 

[MamaTried]

Just use the higher number (8) and count that on the coils 180º from the legs (which typically don't wrap all the way around).

Fuente Fuente Opus X? Padron Annys? Hemingways?

... shudders ... drools... eyes my last 2 remaining Hemingway Masterpieces...

 

[rasci2]

So we live in a world where people are interested in how many wraps my coil appears to have depending on the angle from which it's being viewed?

You guys are nuts. I'm gonna go buy some cigars.

Al vapers are nuts.

 

[Justice]

So if my hand goes around once is that one or 2 wraps

 

[NicoHolic]

Given the leads have to be pointed in the same direction, the first time your hand goes around the drill bit, you're going to have a U, not a complete coil. The side of the bit opposite the legs will have 1 wire around the bit, the side the legs are on will have none, 1 - 1 (the open side of the U). That X -1 carries through additional wraps.

For measurement purposes, whether using the greater number of an X/X-1 description, or someone just saying X coils, what really matters is the number of wraps you count on the side opposite the legs.

Hope this clears it up.

 

[MamaTried]

Given the leads have to be pointed in the same direction, the first time your hand goes around the drill bit, you're going to have a U, not a complete coil. The side of the bit opposite the legs will have 1 wire around the bit, the side the legs are on will have none, 1 - 1 (the open side of the U). That X -1 carries through additional wraps.

For measurement purposes, whether using the greater number of an X/X-1 description, or someone just saying X coils, what really matters is the number of wraps you count on the side opposite the legs.

Hope this clears it up.

WAY too complicated. Pass the ibuprofen, please !

Whoever dreamed up the dual numbering scheme was probably only a day or so off ciggies and still a tad shaky

 

[Justice]

Ok I just wrapped 10 coils I think and I got 1 ohm maybe it was 9 maybe 10 who knows maybe it was 11 either way I'm happy with it

 

[pdib]

Ancient Puffer, you were right the first time. I think this stems from Genisis style atty days. When your wick is 1/8" thick, a wrap is 1/2" long. That makes a difference. You can wrap a Genny wick different ways and actually end up with pretty much full wraps, or half-wraps on ea. end. With the right wire, 1/2" can easily change the vape.

 

[ancient puffer]

So if my hand goes around once is that one or 2 wraps

I'd have to say...yes