Resistance per Meter?

[m4inbrain]

Hey,

decided to give unregulated devices a go (decided on a Armor Prime, unregulated tube with safety features/training wheels), refreshed knowledge of me Ohms law etc - i now face a kind of different problem.

I build my own coils usually, or rather buy pre-claptoned/modified wire and then wind them - now for the "mech", i figured out what kind of resistances i'd like in a coil (intending to use a single coil RDA at between 0.3 and 0.35 ohms), i'm not entirely sure how i figure out what kind of pre-modified wire to get (since just micro coils are hard to get down to 0.3 ohms and still have some surface), they all advertise with "resistance per meter". I'm not sure how that translates into a coil though, is there a trick or something to figure out what a wire that has, lets say, 5.5 ohms per meter resistance will be once i make a 6 wrap coil out of it?

Sorry if that is a dumb question, head is still spinning from trying to figure out all kinds of stuff, if there's something obvious i'm missing.. halp.

 

[Rickster]

http://www.steam-engine.org/coil.html?.......have a gander here

 

[m4inbrain]

Cheers, tried already, doesn't really help for some reason - tried for fun to see resistance for premade coils, put the values in the wire wizard, comes out with something entirely different to what's advertised. Guess "chinese special" is my only option now, not willing to spend silly money on two coils.

 

[Rickster]

Cheers, tried already, doesn't really help for some reason - tried for fun to see resistance for premade coils, put the values in the wire wizard, comes out with something entirely different to what's advertised. Guess "chinese special" is my only option now, not willing to spend silly money on two coils.

Fair enough...in wire wizard fused clapton is staggered clapton...and you need to know the cores and wrap and wire metal types of the pre made coil.....as you rewind, why not just buy a spool of wire

 

[Deleted member 54254]

Ni80 roundwire or flat should give you what you're looking for.

 

[m4inbrain]

I realised i actually have a spool from crazywire, NiChrome Flapton 24awg - which is listed with ~5.5ohm per meter. It's safe to assume that if i go half that resistance, the same build comes out at half the resistance?

For example, with that wire, my 6wraps ohm out at around 0.45 ohm - if i go with, lets say, wire that's listed with 2.7-2.8 ohms per meter, the same coil comes out at 0.22-0.23 ohms? Because if that's the case, i can just figure it out by doing some basic math.

 

[Simon G]

I realised i actually have a spool from crazywire, NiChrome Flapton 24awg - which is listed with ~5.5ohm per meter. It's safe to assume that if i go half that resistance, the same build comes out at half the resistance?

For example, with that wire, my 6wraps ohm out at around 0.45 ohm - if i go with, lets say, wire that's listed with 2.7-2.8 ohms per meter, the same coil comes out at 0.22-0.23 ohms? Because if that's the case, i can just figure it out by doing some basic math.

I don't know if it's 100% safe to assume that but it's what I would use for a guide for sure ..... basically just compare it to something you know and use already to get an idea of where it will come out, you can always alter that a little with an extra wrap or different ID.

 

[Fergmeister]

Surely you could just measure the length of the wire you cut off for your coil? 5.5 per metre so it you used 10 cm of wire there should be around 0.55 ohms of resistance.

Bit of a pain in the arse like, but seems like a logical assumption. It’s not the most vape friendly way of giving you the information though - doesn’t it state AWG, as that would be far easier to work with.

I only use regulated mods though, so I’d probably be a bit more cautious than that lol.

 

[m4inbrain]

Surely you could just measure the length of the wire you cut off for your coil? 5.5 per metre so it you used 10 cm of wire there should be around 0.55 ohms of resistance.

Bit of a pain in the arse like, but seems like a logical assumption. It’s not the most vape friendly way of giving you the information though - doesn’t it state AWG, as that would be far easier to work with.

I only use regulated mods though, so I’d probably be a bit more cautious than that lol.

It only states 24awg flapton which i assume is the main wire, no idea what the clapton is. The idea is actually the same as for what i did, just different (and probably a tad more accurate) execution.

I don't know if it's 100% safe to assume that but it's what I would use for a guide for sure ..... basically just compare it to something you know and use already to get an idea of where it will come out, you can always alter that a little with an extra wrap or different ID.

Yeah i have no idea either, i'll just roll with that, order a spool of around 3.5 ohms per meter wire, that should bring me where i want to be with a bit of wiggle room to play with. I build on an ohm meter anyway, it's just to not waste money on wire that i don't need (since i have "my wire" for all the other drippers etc that go on my regulated mods). It really was more about a ballpark. Now i just need to figure out which wire material is the "most stable" on a heat cycle, as in which changes the least amount when hot (iirc stainless for example changes quite drastically in resistance?).

Cheers guys.

 

[Simon G]

Now i just need to figure out which wire material is the "most stable" on a heat cycle, as in which changes the least amount when hot (iirc stainless for example changes quite drastically in resistance?).

Cheers guys.

That easy to answer ..... Kanthal.

or Nichrome (I think is almost as stable)

SS, Ti, NI all change, that's why they are used for TC.