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Twist pitch

Discussion in 'Wick and Wire' started by GccTxs67, Jun 17, 2015.

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  1. GccTxs67

    GccTxs67 Super Member Verified Member ECF Veteran

    May 18, 2015
    Virginia
    i wanna try a twisted build and Steam Engine wants the twist pitch. I'm unable to measure per its instructions at the moment (have a gauge coming).

    So does anyone know the twist pitch on 26 gauge, double twisted, A1 Kanthal?
     
  2. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

    Jul 17, 2013
    Seattle
    You don't... not without measuring it.

    If you have a ruler that runs down to 1/16", or better 1/32"... just convert metric to inch, or set the default to inch and convert decimal inch to fractional inch.
     
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  3. GccTxs67

    GccTxs67 Super Member Verified Member ECF Veteran

    May 18, 2015
    Virginia
    That work, tested out at .5, exactly what I was going for....
     
  4. Paramaniac413

    Paramaniac413 Super Member Verified Member ECF Veteran

    Dec 2, 2014
    South Central PA
    If I remember correctly, mine came out to something like 2mm
     
  5. GccTxs67

    GccTxs67 Super Member Verified Member ECF Veteran

    May 18, 2015
    Virginia
    Mine measured out at 1.47
     
  6. sedition

    sedition Super Member Verified Member ECF Veteran

    Jul 20, 2014
    New Zealand
    You'll find a gauge extremely helpful for rebuilding - I very rarely do anything vaping related without it close by.
     
  7. sonicbomb

    sonicbomb Vaping Master Verified Member ECF Veteran

    Feb 17, 2015
    1187 Hundertwasser
    But what are you actually measuring, is it the distance between each occurrence of a given strand?
     
  8. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

    Jul 17, 2013
    Seattle
    Yes... and a bit more than just "yes" [​IMG]... because the granddaughter is sick, and I'm up anyway.

    First, remember that wire gauge and length are the sole factors that determine resistance, and that Kanthal A-1 wire electrically self-insulates with an aluminum oxide surface layer. I mention this because even side by side, and twisted together, we're still dealing with separate wires.

    If we take two wires and twist them to a 1mm per ridge rate... that would be a 1mm twist pitch. The tighter the twist, the more wire is required to produce that rate, within a given length, and/or desired resistance.

    For the sake of simplicity, I'm going to just make up some rounded values in an example.

    Lets say that a pair of wires are 60mm in length, have the 1mm twist pitch rate described above, and produce a "target" (desired) net resistance of 0.4Ω.

    if we "loosen" the twist pitch rate to 3mm, but stayed within that 60mm of length... our resistance would drop because, with fewer twists, we're using less wire - not much, maybe 0.05Ω, so... to obtain the same net resistance of 0.4Ω, we'll actually need to increase the wire length to about 70mm, which might add a wrap or two to our coil.

    Were we to go even looser, just a lazy wrap every 5 or 10mm or more... we'd reach a point where the twist rate has nearly no effect on wire length and resistance... until we reach just two wires, side by side, and the shortest lengths needed to produce our 0.4Ω.

    If you refer to the Steam Engine modeling program (see sigline link below), you'll see how, for a given resistance and wire gauge, this works.

    In Steam Engine, regardless of the number of wires are used to make a single coil (although Steam Engine limits this to four wires), it's still considered a single coil... and you would use "single coil" as the set-up.

    Because the program already knows, when you click the profile of "round twisted/parallel", that you're using more than one wire to make a coil, it calculates the builds net resistance as it would for regular, multi-strand in parallel coils.
    If you're building multiple twisted wire coils... then you click the "set-up" for the number of finished coil assemblies in parallel.
     
  9. mcclintock

    mcclintock Ultra Member ECF Veteran

    Oct 28, 2014
    But Steam Engine seems to see a big difference between a slight twist and parallel, not so much between slightly different twists.
     
  10. State O' Flux

    State O' Flux Vaping Master Verified Member ECF Veteran

    Jul 17, 2013
    Seattle
    That's probably because you're comparing two strands wrapped into a single coil assembly, where the wrap of each strand is spaced by the wrap of the other strand... and two wrapped individually for conventional dual parallel coils.

    As a proof of this, if you run a two-wire single coil with a zero twist pitch - just side by side - you'll get a length value.
    If you run conventional dual parallel coils... and adjust the "Wrap spacing" (only found when you hit the "Advanced" button) to the thickness of a single wire - just like a two-wire single coil, with one wire missing - you get the exact same length value.
     
  11. 93gc40

    93gc40 Vaping Master ECF Veteran

    Oct 5, 2014
    California
    do you have a rule or tape measure????????????? Thats all you need to measure the pitch. You count 10 ridges, measure the length of that section of wire and divide by 10. You now have the pitch.
     
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