i recently purchased new coils of the international tattoo supply and they are 10 wrap, 27 mm in lengh. im going to use them for a liner and wondering if that length is alright to use. also if anyone knows any books online that has good information on settings of a tattoo machine. thanks

im pretty sure 10 wraps pack a heavy punch, making them more suitable for shading. but Dave is the expert, ask him

ok thank u. but is the 27mm an ok length to use?

10 wrap is fine for both line and shade, you can use 8 coil for outline as a rule and 10 to 12 for shade and colour

Either way you look at it, weather it be how many wraps or the length of the actual coils, I think what matters is the length (and quality) of copper wire. The more wire used, the more power (voltage) needed to run the machine.

Take FK Irons as an example; I believe they are 8 wraps and with the 1.5 coil system and they run great between 4.5 and 5.5 volts.

Now, I don't know the length in mm exactly but that's a lot less wire than most 10 wrap, full length, coil machines that run at way higher voltage.

Your longer, 10 wrap coils will probably need a higher voltage (I would start at 6.5 to 7.0 and go by sound and the feel of your thumb on the a-bar) then raise or lower it accordingly.

BUT, you should also consider speed of your machine (contact gap) the throw of your machine (The gap between the front coil core and the a-bar) and your hand speed.

It ain't easy.