Question about parallel coil?

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DoubleWesternCheeseburger

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Dec 8, 2013
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All right so I built my first parallel coil.. Single 26g, 4 wraps around 3/32 drill bit (so it looks like 8 wraps total). My volt meter is reading it at 1.4 -1.5 ohms, but when i dry fired it, it heated up really quickly and glowed very bright, which makes me think it's waaaay less than a 1.4-1.5.. Is this really a 1.4-1.5 ohm build or is it the fact that it's a parallel that might be throwing off the voltmeter? There's nothing wrong with the voltmeter as it's reading all my other rdas fine.

Also, if anybody knows, what would the actually ohm be on this build???
 

State O' Flux

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A single 4/3 wrap, 3/32" ID, 26 gauge coil is 0.46Ω+/-. If you had two of them in parallel, your net resistance would be 0.23Ω+/-.

Per Steam Engine:
Resistance wire length (contact points not included) 40.8mm
2.38mm ID
Leg length 4mm (est)
Number of wraps 3.67
— rounded to "full wraps" 3
— rounded to "half wraps" 4/3
Coil resistance (per coil) 0.46Ω​
 

DoubleWesternCheeseburger

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thanks, i use steam engine quite a bit and am pretty good with dual coils. but is the dual (parallel) coil on steam engine the same as the one rip buils in his video:

Parallel Coil Build - YouTube

i get that there are 2 single 4 wrap, 26g, 3/32 coils and that should come out to ~.28, but does parallel like in rips video effect that in any way?
 

Cullin Kin

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Please please please get an accurate ohm meter built for reading 510 connection devices. It could save your face, and hands, and left pinky toe. Seriously though, please do it. I know you said your volt meter is fine, but these 510 ohm readers are cheap and they're build to read these devices.

Okay, now that I'm off my soap box, RIP did his with 24g kanthal wrapped on a 1/8" bit and got a resistance of 0.25Ω. You used 26g kanthal on a 3/32" post, the smaller inner coil diameter will decrease resistance but the thinner wire will increase resistance (these should effectively negate each other with our margin of error). A parallel coil is like parallel resistors and the resistance is halved when there are two resistors, 1/9'ed with three, etc. Here is a parallel resistor calculator along with the actual equation (that's a PITA to type out without an equation editor): PARALLEL RESISTOR CALCULATOR

Therefore, a single coil with 26g kanthal wrapped 4 times around a 3/32" post would have a resistance of 0.51Ω and that same coil in parallel (two pieces of wire wrapped together) with have a resistance of 0.255Ω. It is effectively the same as the 'dual coil (parallel)' option on steam engine (only for a single parallel). Please be careful.
 
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