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  1. #1
    Mentor lost's Avatar
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    Help with RSST build and pulse method

    So last night I took some time to try and build my rsst. Here is what I did:

    400x400 mesh cut 10x10.5 cm. 10.5 being the rolling length. 10cm makes way too long of a wick.. next time I'll go with 6 or 7 I think.
    Battery at around 3.7 volts as per my VAMO.
    32 AWG nichrome wire.

    Burn the mesh a bit with a lighter (no torch yet) just to burn off some potential icky stuff.
    Tried 4 wraps.. then only 3 wraps when I re-wrapped it the 2nd and 3rd time.
    Pulsing didn't seem to go well. It just kept stopping at points and if I tried to make an "adjustment" then it would screw up the other end.
    After much fiddling and actually re-doing the wire twice I finally got a nice evenly glowing coil although it seemed to take a long time for it to "get red".
    Put it on my VAMO and its reading 9.9 ohms.. *sigh*

    Any suggestions? Here is a pic of my coil as I ended last night.. I was tired and had some double vision going on from staring at it so long.

    Help with RSST build and pulse method-img_20130515_073707-jpg
    Vaping since January 25th, 2013

  2. #2
    Mentor MarkLib's Avatar
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    It's shorting out somewhere. Either on the deck, or in the tank (don't think an RSST can since it's all plastic inside?), or on the wick (coil too tight on the wick) or frayed edge on the wick causing an intermittent short. Some shorts will not show up as a hot spot that is easily visible and could just be very slightly brighter coil than the others, dim lighting helps to spot those. You will just have to play with it some more, keep at it, it will come around eventually.

  3. #3
    Mentor MarkLib's Avatar
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    If you have a multimeter it will help out too, put the leads on the positive and negative screws and check the resistance, if the numbers level out and don't jump around you are on the right track. If the resistance starts wandering around you definitely have a short going on.

  4. #4
    Mentor lost's Avatar
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    So when I wrap the coil I want to apply lots of pressure or not so much pressure. Don't you want it touching the wick? If not then how in the fark do you wrap that.. yeesh.
    Vaping since January 25th, 2013

  5. #5
    Mentor MarkLib's Avatar
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    You don't want the coil cutting into the wick, that would be to tight. But you also don't want to be able to see day light between the coil and wick, after some heating I sometimes get space between the coil and wick and will have to wiggle the wick around a bit to fill in that void again. It's a fiddly thing sometimes, but when you get it just right it is so worth it. Good luck and don't give up!

  6. #6
    Mentor lost's Avatar
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    Is it possible that I got good wick contact but didn't pulse it enough? Isn't the idea of pulsing to burn off some wick contact points/shorts? I definitely didn't use enough pressure to "cut into" the wick. That would be a lot of pressure.
    Vaping since January 25th, 2013

  7. #7
    Advanced Mentor rotormonkey's Avatar
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    Basically you want to wrap it JUST tight enough that it's touching the whole way around, but not tight at all. If you're having trouble try the drill bit method for wrapping the coil.

  8. #8
    Guru Trainer Mindfield's Avatar
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    Using purely the pulse method can take a while. For me, before I managed to get a well-glowing coil, I probably spent about 10-15 minutes straight pulsing shorts out of the coil, adjusting the coils, lather, rinse, repeat. Then I'd have to drop some PG on and burn off and repeat several times, checking for hot spots or waiting for it to "pop" (that is, throw a short unexpectedly which drops the resistance so fast it causes the juice to pop from the sudden rush of heat). Once I was satisfied that I wasn't getting any more shorts, then I'd fill and vape. I have a coil (0.28AWG Kanthal) right now that's working pretty well, though it's still not producing thick clouds of vapor despite being ~1.2ohms (5 wraps). So I'm far from any expert, but that's how I got this far, anyway.

  9. #9
    Mentor lost's Avatar
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    I was pulsing the last coil wrap I did for almost 30 minutes. Sometimes it would pulse fine and I would see some of the wire get red, but then all of a sudden I would push the button and nothing. Its like I had to start over again even though I didn't let the wire/wick cool at all. All those youtube videos made this look so much easier than it actually is. Yeesh. Thanks for the suggestions. I do hope to get back to this tonight and try again. I wonder should I keep going with that coil I have in the picture or start over with a new mesh wick? Any thoughts on that?
    Vaping since January 25th, 2013

  10. #10
    Advanced Mentor RollandOfGilead's Avatar
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    Re: Help with RSST build and pulse method

    Quote Originally Posted by lost View Post
    After much fiddling and actually re-doing the wire twice I finally got a nice evenly glowing coil although it seemed to take a long time for it to "get red".
    Put it on my VAMO and its reading 9.9 ohms.. *sigh*
    If it was evenly glowing that should be right on. Turn up the voltage a bit and it wont take long to glow.

    The vamo will read 9.9 if there is no connection. Coil is popped OR post isnt contacting properly.

    If it works off the vamo then its likely the post. I had the same thing happen when I first built my DUD. I tightened the bottom screw holding the top of the tank together too much and compressed the insulation in the 510 connection causing the center post to pull up too much.


    Sent from my SGH-I747M
    "A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort."
    --Herm Albright


 

 
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