Absolutely identical resistance in multi-coil atomizers
After I responded to an interesting thread found here... I started thinking about the (highly unlikely) chances of truly identical multi-coil builds - considering how atomizers are made and the individual components that go to make up the whole - where heating lag time from coil to coil is... should be, for all intents and purposes, identical.
What elements of an RDA - or any multi-coil atomizer for that matter - and "build methodology", will lead to improving the chances of identical individual coils in a parallel build?
To "test" an atomizer, or individual coils for that matter - will be not only impractical, but fairly difficult and even costly - due to the nature of how atomizers are designed, and how we fit coils.
Some of the methods I'll mention will be wildly impractical and unlikely to be followed by anyone - including myself, an OCD geezer with time on his hands - so this is more an exercise in fanaticism. ;-)
Moving on to the (far) less likely...
- Atomizers with "monobloc construction" - negative terminals machined as part of the atomizer base will have reduced variation in resistance vs. atomizers with pressed or screwed in terminals. This first one is entirely reasonable, and quite common, even with cheap clones.
- Atomizers with monobloc positive individual post holes (machined from a single piece of metal, with multiple fixing holes/screws), or single "common point wire attachment" terminals will have reduced resistance variation vs. positive terminals with multi-element construction. Another, not uncommon practice.
- Individual coils, made in such a fashion that the tension applied can be measured, so that the stretch rate of the wire will be identical, one coil to the next. This isn't too unreasonable when you realize that the Jon Kuro's "KuroKoiler" and super_x_drifter's coil manufacturing methodology provides some level of repeatable, wire tension consistency.
- Screw (female) threads and (male) threaded terminals... manufactured with a goal of high precision - identical engagement - rather than mass produced at a scale intended to meet practical economic requirements.
That's about all I can think of... if you want to play this game, think of other materials and methods, and include the chances of your ideas actually being used.
- Torque values of individual wire fastening points. Yes, you read that right... torque values, as in identical inch-pound values of torque applied at each terminal. Chance of this happening - considering the investment in a low value, precision torque screwdriver - near zero, unless you own this tool already.
- Individual testing by the manufacturer, for milliohm variations - within limited acceptable parameters - of each and every wire fastening point. Not holding my breath on this one.
- Measurements of coil tails, from coil main body to terminal attachment point - with a goal of length consistency - to the one hundredths of a millimeter place. Another highly unlikely event, even if one owns a quality digital caliper.
- Thinking of other ways to do this quickly and easily... one could develop a "length spacer" - made from a material I've not come up with a good answer for - that pre-sets the leg (or tail) length of each coil... then dissolves when heat is applied, with no toxic residue.
- Another method might be a plastic or metal "standard" that one could hold next to a coil leg, insuring that each leg is near identical in installed length.
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