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What is the ohm rating of your coil?

 

what is the rating of your battery?

 

honestly, your post worries me.  It's not that difficult to educate yourself on this subject. Your question reveals that you have more to learn and understand before you randomly start building coils and hope that some guy on the Internet a thousand miles away is going to give you assurance that you're ok.  YOU should know you're ok because you understand how to safely build a coil.  You shouldn't be building coils if you don't know what you're doing just because it's easy to do. You are risking fire or injury to yourself or others. Be smart. Know before you go. It's not worth the risk.

 

You can go to somebody who knows and have them check it out

you can inexpensively get the meter you need to determine yourself 

Read up a little on coil building. There is good info out there. 

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Not enough info to go on  Are you using Kanthal, Nichrome, Titanium, flat, twisted, ... what?   If using Kanthal... 8 wraps (full wraps) around a 2mm mandrel will be ~1.2 Ohms (which should never be fired at 40W.  Even worse would be if the coil were wrapped on a 3mm mandrel (~1.7 Ohms).   Wrapped on a 1mm mandrel would be 0.7-0.8 Ohms... still nothing I'd push 40W into!!

Power is not everything.... and you must learn proper coil wrapping as well as Ohm's Law if you're going to build.  But before you do anything... BUY A METER!

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If you truly know your way around a coil, then you'd know if you would have any problems or not with the one you built. Bebop and Earthling gave you some valuable advice: get a meter and more education on building coils, Ohm's law, GET A METER, how to do this safely... 

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