Twisted Question

[CDroverNL]

I've only started building recently. I tried twisted coils today and they are pretty good. The only thing is, when I do up the coil on a coil calculator my single came out to 0.85ohm. I put it in my goblin mini and it came out at just that but after pulsing and pinching it jumped to 1.14. That seems like a big jump to me, is that normal? It's twisted 30g kanthal, wrapped 2.4mm id, 6 wraps.

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[Lost]

Did you make the twisted wire, or did you buy it?

If you made it, you can throw off that coil resistance by at least .25 ohm just by how tight or loose you twist the wire.

If you bought it, and your coil calculator doesn't have twist pitch, your calculator could be assuming too much.

http://www.steam-engine.org/wirewiz.asp

 

[CDroverNL]

Did you make the twisted wire, or did you buy it?

If you made it, you can throw off that coil resistance by at least .25 ohm just by how tight or loose you twist the wire.

If you bought it, and your coil calculator doesn't have twist pitch, your calculator could be assuming too much.

http://www.steam-engine.org/wirewiz.asp

Thanks for the response!
I twisted it myself and my calculator does not have twist pitch.
What twist pitch? lol

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[Lost]

I can't take decent close-up pics, but this is good enough for the explanation.



Twist pitch is essentially the measurement between ridges. This is 2-strand 26-gauge twisted Kanthal with a twist pitch of 2.5mm.

To make it easier on yourself, count the ridges in 10 or 20 centimeters and divide. Here you see almost exactly 4 ridges in the span of 10mm, so 10 divided by 4 is 2.5.

According to Steam Engine, your coil would be about 1 ohm if you had a twist pitch of 2.5mm.

If you make your twist tighter, there's more wire, which means more resistance. Your coil would be 1.265 ohm if you had a twist pitch of 0.5mm.

I used to twist my wire until the Kanthal snapped off the chuck. This last batch (in the pic), I stopped early and the coils were perfect for my setup. So I'll be measuring while I twist for my next batch.

 

[CDroverNL]

Perfect. Thank you!
That will be very useful the next time I make more.

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[goingbonkersiam]

Had same problem until I got the tension just right. Seems that it can flex when heated. Maybe I'm wrong but once I got it super tight ohm quit jumping.

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[CDroverNL]

Had same problem until I got the tension just right. Seems that it can flex when heated. Maybe I'm wrong but once I got it super tight ohm quit jumping.

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Oh, makes sense! I'll keep more tension next time as well

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[goingbonkersiam]

This was my first attemt. Ohms stayed pretty stable and it was a beast

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[HondaDavidson]

Also sometimes you have to retighten the post screws after pulsing. Loose connection could account for an OHM jump.

 

[JERUS]

Also sometimes you have to retighten the post screws after pulsing. Loose connection could account for an OHM jump.

This^
Ohms reading higher than expected or jumping up, tighten things up and check connections (could be the coil in the deck or the 510 connection, check both).

Ohm reading lower than you thought, check for a short, could just be some wire touching and having hot spots, wiggle and tweak them out and you'll see it rise.

 

[raymo2u]

Ive never measured the Twists, I usually go by "feel" but I try to always get 4 ridges within an inch when making wire as one inch is a full wrap on a 3mm coil...

 

[zdawk]

View attachment 44598 View attachment 44599 View attachment 44600 View attachment 44601

God those are beautiful

 

[CDroverNL]

That is some wicked wire!

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[ljbmx1211]

I've only started building recently. I tried twisted coils today and they are pretty good. The only thing is, when I do up the coil on a coil calculator my single came out to 0.85ohm. I put it in my goblin mini and it came out at just that but after pulsing and pinching it jumped to 1.14. That seems like a big jump to me, is that normal? It's twisted 30g kanthal, wrapped 2.4mm id, 6 wraps.

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Hey I've learnt a lot from
Twisted messes, with twisted builds don't be afraid to push the limits of the twists. Twist it up as tight as possible. When it breaks at the chuck of the drill flip it over and take pliers and twisted till it breaks one last time, Makes it very tight and it's a nice vape and nice flavor. A lot of time twisted builds like to short out with in them selfs when pulsing (firing) taking out hot spots after making them glow nice and evenly it should read out a different ohm, I know because I build twisted a lot

 

[Chewy]

I just build this one today and only had one hotspot which sorted out by its self only got 0.02 ohms up. Like others have said if it moves to much it's probably loose a bit

 

[ljbmx1211]

Twisted wire also jumps ohms because it tends to short out within its self when pulsing it so when it's firing all evenly and tightened down the ohms
Stay at what it reads


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