Hot legs

[Mapultz]

The legs of my coils keep burning the rubber tube thingy in the bottom of the protank coils. Awful smell!!

I tried wrapping the silica and a sewing needing together with the wire. Set the coil and needle into the body of the atty to keep the coil stable and high up enough. It was a beautiful one. Perfect 2.0 ohms. Glowing uniformly. And then the smell...

Help!

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[cramptholomew]

What's the resistance? Did you try to cut the excess wire off, or did you wind it off? One of the legs could be poking out from by the grommet on the bottom, and shorting it out.

 

[Mapultz]

The resistance was staying right at 2. The wires were cut as close to the grommet as possible.

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[Mapultz]

I have Googled and tried doubling up the legs and twisting together... Maybe I'm doing it wrong, but it's still not working.

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[Izan]

Have you tried the redi-made res/non res wires?

Makes the issue vanish...

Good luck
I

 

[Keeferes]

The legs of my coils keep burning the rubber tube thingy in the bottom of the protank coils. Awful smell!!

I tried wrapping the silica and a sewing needing together with the wire. Set the coil and needle into the body of the atty to keep the coil stable and high up enough. It was a beautiful one. Perfect 2.0 ohms. Glowing uniformly. And then the smell...

Help!

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What exactly are you wrapping? Is is kanthal a-1 or something else? What is the gauge wire you are using? Are you trying to wrap micro coils or regular? What is the inner diameter of the coil you are trying to wrap?

 

[Mapultz]

I'm wrapping 2mm silica with 32ga kanthal. I'm trying for 1.8-2 ohms or so. I've done 4 and 5 wraps.

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[Mapultz]

The ohms always come out perfect. The coils fire and seem to glow evenly. But then there's that smell. It's gotten into my nose and I can't smell anything else!

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[Keeferes]

Are you sure there no kinks in the legs and they are perfectly straight down the tube and securely isolated from one another.

Sometimes to much tug, and not enough can cause problems. Also in my experience, once a grommet has been scorched, it will always give off the smell/taste.

 

[Mapultz]

Hmm I will try with a non torched grommet. I cleaned this one with vodka and rinsed it well...But maybe it's still yucky.

Was it my fault it got burned in the first place? I put it on a base and fired it dry to make sure it worked and was glowing. I figured if you can dry burn a coil, this would be the same thing...

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[Keeferes]

I can't say yes or no on tour fault. Time you fired, volts fired at, etc all come into play at that point. Hope you work it out though. I don't remove which vendor, kidney puncher I think, sells silicone replacement grommets.

 

[Mapultz]

I only do it for a few second at 6 watts.

I tried a fresh grommet and it still happened. I don't get it!!!!!

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[Dusif]

My experience with hot legs is that the legs gotta be the same length and evenly tightened


__________________________
M16 helio 0,35
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Vamo vivi/protank
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[Mapultz]

OK I think I've got it. With a fresh grommet and twisting the legs, that seems to have worked. Hopefully.

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[dripdaze]

Do not dry fire pro tank heads. They can burn.

 

[Christopherja]

Do not dry fire pro tank heads. They can burn.

What can burn? The coils, or the grommet?

I don't think I'm alone in having dry-burned ProTank coils about a million times with no worries - limited pulsing of course.

 

[dripdaze]

The grommets can burn if the voltage is too high or the pulse is too long.

 

[Mapultz]

Do not dry fire pro tank heads. They can burn.

I've dry burned them before after cleaning, so I thought it would be ok. Nope!

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[Christopherja]

The grommets can burn if the voltage is too high or the pulse is too long.

Oh, right - yes. If you're dry-burning, probably best to (a) go with short pulses and (b) set your device to a low voltage. Shouldn't be any problems if you keep it to that.


Oh, and re: the thread topic - I've always understood that "hot legs" result from either too much tension, or not enough tension. Very fickle, I know!

 

[timshead]

It's the grommet. I just went throughout he same thing. If the grommet is whiter and looks like it's made of rubber, you are way more likely to have the problem. If it's clearer and looks like it's made of silicone, you likely won't have any problems. I rebuilt the same head at least a dozen times yesterday before swapping out the grommet. Once I put in a silicone one, it was perfect.