Dry burning glow not even

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CMD-Ky

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New to rba and the one thing I cant do is get them to glow even. They tend to glow from the middle then the ends slowly start to glow. How big an issue is this. They have been vapeing fine.

Sounds like a winner to me.
 

UncLeJunkLe

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They tend to glow from the middle then the ends slowly start to glow.


That's typically what you're looking for - glow starts in center then spreads outwards toward the ends. If it doesn't do that, you can lightly "strum" or brush the surface of the coil with the tip of a screwdriver or tweezers (metal or ceramic) and it will eventually fix the issue.

 

zoiDman

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New to rba and the one thing I cant do is get them to glow even. They tend to glow from the middle then the ends slowly start to glow. ...

That is Typical. And Actually what you are looking for when you do a Dry Burn.

The Center of the Coil has the Greatest Distance/Resistance Ratio from the the Non-Resistance points of an Atomizers Posts. And as Temperature Increases at any point in a Heating Coil, so does Resistance. So Feedback Loop is created.

If you uses a High Wattage to do a Dry Burn (Not Advisable) the Center Heating effect is not as Noticeable. But if you use a Low Wattage (Highly Advisable), the effect can be Very Pronounced.
 

Z-Lee

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  • Apr 17, 2021
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    New to rba and the one thing I cant do is get them to glow even. They tend to glow from the middle then the ends slowly start to glow. How big an issue is this. They have been vapeing fine.
    As others have mentioned, this is ideal. More importantly, you need to be looking out for hotspots. They look like little lightning streaks (much brighter than the rest of your coil) that will form lengthwise along your coil starting most often at the first wrap of your coil from the leads (legs) on either end and moving inward toward the middle of the coil. Make sure to look on the inside of your coil along the portion facing the deck to make sure there aren't any hot spots along the bottom that you cannot see. Those can be strummed out from the inside of the coil with swiss tweezers or any fine pointed metal/ceramic object you have such as a coil jig - assuming it's small enough to get inside your coil at a decent angle.
     

    Miles Himan

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    UJ... very nice (and short video) I saved that for other newbies. A picture (video) is worth a thousand words ;) I always do a "dry burn" of new builds (coils) both to work out "hot spots" and to get an idea of how many watts to vape at (generally slightly higher than dry burn wattage) Don't get the coils glowing too hot... short pulses until they glow evenly... that's all you need.
     

    Z-Lee

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  • Apr 17, 2021
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    UJ... very nice (and short video) I saved that for other newbies. A picture (video) is worth a thousand words ;) I always do a "dry burn" of new builds (coils) both to work out "hot spots" and to get an idea of how many watts to vape at (generally slightly higher than dry burn wattage) Don't get the coils glowing too hot... short pulses until they glow evenly... that's all you need.
    I generally agree with this, but it also depends on how you vape. Try this on the next new coil you install. Use your method of strumming out the hotspots, and then when they're completely out, use slightly longer pulses until the coil is almost completely glowing orange. Often times, with the added stress of heat, the coils will form new hotspots that should also be strummed out.

    If you know 100% that you will never heat the coil that hot, then this method doesn't really apply to you for the most part. But for those that do chain vape and/or get their atomizers quite hot, that (along with time between vapes) is going to prevent the coil from cooling down as easily, which means the same amount puff timer firing will result in a higher temperature peak for the coil. Thus the formation of unintended hotspots which will eventually result in burning. This is evident when the first puff we take from a cold coil often takes a second or two longer in firing time to reach the preferred vape.

    One of my favorite tasting RTAs is the Uwell D2, but it's dual coil, the chamber is quite small, and it isn't insulated very well. I don't chain vape that, and after 10-15 minutes of use, that RTA heats up so much that it's hard to unscrew without feeling like you're burning your fingers. It even heats up the mods it's being used on so I remove it after use. The first time I replaced the wick on this RTA, there were black char marks all over the cotton. Upon rewicking, I strummed the coils to a much hotter temperature and most of the char marks were not present on the second wick replacement. I dry fire all of my coils now to a much higher temperature than I intend on vaping at to make sure I get out all of the visible and potentially unintended hotspots.
     

    Z-Lee

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  • Apr 17, 2021
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    @Z-Lee , you seem to have more experience than me (and give really good advice) I said to go easy because some newbies might cook that coil. BTW, I even learned something from your post.
    Yeah, I see your point there and I agree. I've even caught myself about to dry fire a new coil at 50W or 60W on more than one occasion, lol. Good stuff.
     
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    englishmick

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    Yeah, I see your point there and I agree. I've even caught myself about to dry fire a new coil at 50W or 60W on more than one occasion, lol. Good stuff.

    I watched a video when I started making coils. Apart from using low power the guy said you should start by giving it very short pulses, not enough to make it glow. Slowly increase the length of the pulses until it started going red. Can't remember why he recommended that but it's how I've always done it since then.
     
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