Titanium wire build tips.
So after a fair amount of experimentation and not a little trouble, strife and disappointment I have now arrived at what seems like the ideal type of build for my style of vaping.
Considering that my go to ADA is a Heron It was pretty much always going to be a microcoil type build, in fact it's almost identical in it's basic methodology to the Nickel microcoil build.
I've used 0.5mm Ti01 from Stealthvape, done 7 wraps and used pliers to pull the wire tight on my coilmaster type tool (any mandrel will work as log as it's strong enough to take the punishment you're about to dish out to it).
Wrap the coil on the tool and at this point don't be too worried about whether the wraps touch or not, once you've got it wrapped grab the ends of the wire in pliers or trap them in a vice and pull the coil tight, really tight, I mean swing from it like Tarzan tight. Once you've got it tightened up the first thing you'll notice is that the instant you released it, it expanded somewhat, that's OK and what you do next depends on the Atty you're using and just how much the coil expanded.
Fit the coil into the atty still using the mandrel for support - It will make everything easier and you can be fairly brutal about tightening down the post screws. Now the coil is in place check how much the coil has expanded, if it's still pretty tight on the mandrel thats good, if not don't panic. Turn the Mod up to 300c or 600f - whatever the max temp is for your device and after removing the mandrel fire the coil, you'll see the wire change colour - that's good, at this point re insert the mandrel and if you've still got a fair amount of slack you can pull the coil tight again and adjust the legs to fit the coil in it's final position, remove the mandrel and fire one more time.
Now it's time to fine tune the coil - You'll need to reinsert the mandrel and using a pointy tool or very thin flat screwdriver move the wraps into their final spacing. The mandrel will allow you to be pretty rough on the coil without destroying it's shape. I've found that anywhere from a half to a whole wire thickness of separation between wraps works perfectly. Take your time doing this step, Titanium is tough stuff and once you've got the coil in there if you've ever rewicked a coil then you'll have nothing to fear about rewicking this one - It will stand most reasonable treatment, certainly anything you'd do with a Kanthal coil.
Once you're happy with the coil's physical characteristics then all that's left to do is to wick it up, as with Nickel - less is more, the cotton should be fairly loose with only slight resistance as you pull it through. If you've got the spacing right (no wraps touching anything) and haven't overstuffed it with wick you should get gratifying results.
I've found that now the weather is getting colder it sometimes takes a draw or two to get right up to temperature but the Heron I use has a lot of mass that has to be heated and that takes a little time, something with less mass or a more "insulated" deck will be far quicker to heat up...
A final note on dry burning - Dry burning Titanium is pretty dangerous - It can and will burst into flames and even if it doesn't burst into flames heating it too much can cover it in a layer of Titanium Dioxide which is considered extremely unpleasant to inhale. Theres a little on that earlier in this thread so read up on it. That said I have experimented - extremely carefully (In a container made of insulating refractory brick) and have found that you can safely dry burn Titanium if you stay at the very dull red end of the temperature range. You do this at your own risk and I will accept no responsibilty if you burn down your house, melt your face or any other body part, or just ruin your atomiser.
Happy Vaping...