dual coil ni200

[SteveF]

I've started to play with temperature control and Ni200 coils, firstly I'm not making my own coils ( more later) I added some 0.15 ohm and 0.2 ohm (0.3mm x 3mm x 10 & 12 turn) coils to my last fast tech order. The basis on buying these higher res coils was essentially that I could reduce the number of coils if required to fit in a subtank rba and there would be enough resistance to make dual coil builds.

No problems with the single coil, a 0.15ohm coil reads 0.13-0.15 no problem, the 0.2ohm coil reads spot on but for some reason when I make a dual build in a dripper they read 0.03-0.04 ohms.

Is one of the joys of Ni200 or am I missing something?


2) touching  or micro coils, for some reason the 0.2 coils are micro, unspaced, its not really an issue to open them up but most sources say spaced coils yet here and there the odd preson says that they don't find micro coils a problem...
BTW I've just opened up a couple, twisted them in a drill and made a really nice 0.07 ohm coil for my velocity, if only the mod would read down to 0.03

[phatfil]

no afaik Ohms law should apply so 2 x 0.2 ohm coils should give you 0.1 ohm resistance..

and with Ni200 open spaced coils are best as if they are touching like kanthal coils generally are they can conduct between the loops unlike kanthal and short out giving a much lower resistance..

i have the same coils myself recently arrived from FT.. and both are spaced.. (just been and checked ...) and will compress like a spring if squeezed.. tho the 0.15 ohm coils are tighter coiled there is still some space between the loops ?

have you matched leg length when building dual coil heads? and have you ensured no legs have been pinched in two by 'sharp' post screws..

i have the same coils from FT
www.fasttech.com/p/2330206 and
www.fasttech.com/p/2330202

[reefcat]

This happens to me sometimes, provided there's nothing obviously wrong, I just wick them and fire away. A couple of button pushes and they seem to sort themselves out and the resistance changes to a more realistic number.

Don't know why, it just does

[VapingBad]

Oct 17, 2015 17:15:19 GMT SteveF said:

I've started to play with temperature control and Ni200 coils, firstly I'm not making my own coils ( more later) I added some 0.15 ohm and 0.2 ohm (0.3mm x 3mm x 10 & 12 turn) coils to my last fast tech order. The basis on buying these higher res coils was essentially that I could reduce the number of coils if required to fit in a subtank rba and there would be enough resistance to make dual coil builds.

No problems with the single coil, a 0.15ohm coil reads 0.13-0.15 no problem, the 0.2ohm coil reads spot on but for some reason when I make a dual build in a dripper they read 0.03-0.04 ohms.

Is one of the joys of Ni200 or am I missing something?


2) touching  or micro coils, for some reason the 0.2 coils are micro, unspaced, its not really an issue to open them up but most sources say spaced coils yet here and there the odd preson says that they don't find micro coils a problem...
BTW I've just opened up a couple, twisted them in a drill and made a really nice 0.07 ohm coil for my velocity, if only the mod would read down to 0.03

There is a problem somewhere as phatfil said it should be 0.1 ohm, probably shorting wraps try strumming them.

[SteveF]

Oct 17, 2015 18:08:47 GMT phatfil said:

no afaik Ohms law should apply so 2 x 0.2 ohm coils should give you 0.1 ohm resistance..

and with Ni200 open spaced coils are best as if they are touching like kanthal coils generally are they can conduct between the loops unlike kanthal and short out giving a much lower resistance..

i have the same coils myself recently arrived from FT.. and both are spaced.. (just been and checked ...) and will compress like a spring if squeezed.. tho the 0.15 ohm coils are tighter coiled there is still some space between the loops ?

have you matched leg length when building dual coil heads? and have you ensured no legs have been pinched in two by 'sharp' post screws..

i have the same coils from FT
www.fasttech.com/p/2330206 and
www.fasttech.com/p/2330202

Thanks for the replies.

not the same ones phatfil, I had the $3.13/50 coil packs

everything is visually the same on the set up, don't know what it is because I have fitted each coil, read it, then removed one and come up with 0.15 or 0.20 again...grr.
I'll have another go tomorrow when my patience returns to normal levels.

[markus]

Oct 17, 2015 18:08:47 GMT phatfil said:

with Ni200 open spaced coils are best as if they are touching like kanthal coils generally are they can conduct between the loops unlike kanthal and short out giving a much lower resistance..

Valuable info for when I get my Ni200 wire from Gearbest (I hope its genuine Ni200 ! ), thanks

[phatfil]

Oct 17, 2015 18:39:23 GMT SteveF said:

Oct 17, 2015 18:08:47 GMT phatfil said:

no afaik Ohms law should apply so 2 x 0.2 ohm coils should give you 0.1 ohm resistance..

and with Ni200 open spaced coils are best as if they are touching like kanthal coils generally are they can conduct between the loops unlike kanthal and short out giving a much lower resistance..

i have the same coils myself recently arrived from FT.. and both are spaced.. (just been and checked ...) and will compress like a spring if squeezed.. tho the 0.15 ohm coils are tighter coiled there is still some space between the loops ?

have you matched leg length when building dual coil heads? and have you ensured no legs have been pinched in two by 'sharp' post screws..

i have the same coils from FT
www.fasttech.com/p/2330206 and
www.fasttech.com/p/2330202

Thanks for the replies.

not the same ones phatfil, I had the $3.13/50 coil packs

everything is visually the same on the set up, don't know what it is because I have fitted each coil, read it, then removed one and come up with 0.15 or 0.20 again...grr.
I'll have another go tomorrow when my patience returns to normal levels.

got a linky??  thats a much better price..

[phatfil]

markus the how to's ive seen and failed to replicate use machine screws to wind round in the thread depressions to space evenly, My wire tho springs out to 2-3x the form diameter tho i think i have the wrong wire, (too pure 99.9% not 99.6??, its nickel no- res wire for nores-res-nores wire builds for coils with Long legs..)

[SteveF]

[/quote]got a linky??  thats a much better price..[/quote]


www.fasttech.com/product/2993500

[SteveF]

update; with much patience I managed to get a pair of 0.15 coils to read 0.073 , I got one vape and the mod flashed up 'low resistance' followed by 'short'.

Damned Tobecco Mutation X4 has never been good with thin wires as the posts are over-drilled, the wire came off one post cut by the screw I assume the short followed soon after. I won't try it again in that atty and have reverted to a pair of Kanthal claptons.

Full size Velocity clones are running nicely on single 4mm twisted Ni200 coils, plenty of vapour with reasonable flavour but they just seem muted until the last couple of draws before the wick starts to show signs of drying.
 I cracked open the second bottle of Kreeds Kustard ( its three weeks old!!!) and tried from 200c to 250c, best flavour is at 210, but in comparison to letting my trigger finger control the power on a pair of kanthal coils...passable.

On the other hand 0.08 builds in the sub-tanks are rocking, just hit the button and vape pretty much worry free. Good job I bought some Samsung 30Qs last week.

[tonyb]

Steve if your mod can handle it Titanium wire is a lot more forgiving than Ni200. I've never had much luck with dual coil Ni200 builds you have to use thin wire to get the right resistance and coils because they need to be spaced end up huge which presents its own problems when trying to install in a tight deck.

Titanium can be built compressed or spaced and has a higher resistance so you don't need so many wraps/coils to get the resistance where it needs to be for the mod to fire.

[SteveF]

cheers Tony,I had a couple of tc mods at the time and I was trying to make more use of my sigelei150tc, Also convinced myself that with a box full of kanthal and nichrome I didn't need another load of wires to play with.
However (as you do) I caught the TC bug and moved on to titanium and stainless PDQ and the Ni200 went into the don't use drawer.

[catface26]

For what it's worth, according to Steam Engine, to achieve 0.2 with 28g nickel wrapped around a 3mm bit you would need 14 wraps not 12. So not sure about Fast Tech's maths there.

[SteveF]

I had to check a couple of times, even got the digital calipers out and measured the wire.
my mods read individual coils pretty much bang on but I reckon the problem was always with the atty with duals
They also had long legs so initially I wasn't sure if the resistance was for the whole length.
I also took 3-4 turns off to fit my subtank rbas and came up with either 0.09 or 0.12 respectively.