Let’s briefly touch upon what you’re going to need for coil building and how the process looks like. Before doing any build of your own, it is very important to get at least a basic understanding of Ohm's law. Building your own coil incorrectly can lead to injury, so study this principle until you understand it.
What you will need to build vape coils:
- An ohms reader
- A coil maker (specialized tool for building vape coils) or a small screwdriver (2 mm)
- Vape wire
- A small screwdriver or an Allen key that fits the screws of your RDA
- A lighter or a propane/butane torch
- Nail clippers or wire cutters
- Tweezers (ceramic tip)
- Now you’re ready to build!
Before you start, it’s always a good idea to check just how many wraps your vape coil will need until you reach your target resistance. A coil wrapping calculator such as the one provided by steam-engine.org is great for that. In this particular case, to get a 1-ohm resistance from a single SS 316 coil with a 2 mm diameter, we will need eight full wraps. Ahead of coiling, make sure to oxidize your wire (heat it with a lighter or a torch until it glows) to make it less springy and easier to work with.
Wrapping the coil - cut 4 - 5 inches of wire and use your screwdriver to make wraps. Start near the shaft of the screwdriver so you can hold the wire in place with your thumb. Continue wrapping it around the screwdriver, making sure that your wraps are as close to one another without overlapping. Once you’ve reached 8 full wraps (the ends of the wire should face in the same direction), leave the coil on the screwdriver and proceed to the next step. Note that using a coil wrapping tool usually results in nicer looking coils and is faster, at least if you’re a beginner.
Installing the coil - unscrew the posts on your RDA carefully (not all the way out so you don’t lose them) and use the screwdriver to carefully position the ends of the coils into the post holes (one positive and one negative). Make sure that your coil is positioned at the center of your RDA deck. Now, tighten the post screws gently. Remove the screwdriver and trim the protruding legs as close to the posts as you can (nail clippers work like a charm here).
Test firing the coil - now that the coil is installed, it’s time to test fire it. Before you do that, make sure to check the resistance with your ohms reader. Simply screw your RDA onto it and it will display the firing resistance of the coil. Don’t be alarmed if the reading is off by 0.1-ohm up or down - that happens often. However, if the discrepancy is not within that range, check to see if the post screws are tight and if the coil is touching the posts or the deck. Adjusting those two things a bit will usually solve the problem.
After that, attach your RDA to a mod and briefly fire it until it glows. What you want to see is even heating, starting from the center of the coil and moving to the ends - you don’t want any hotspots that might cause the coil to snap in two. Use your tweezers to gently pinch the coil together and repeat until it heats evenly.