But if it can be used with thick walls. You do not need to use a little far but stage.If the task can use the thick tube is 0.014 ", it is possible to manufacture the coil fins as FPI away stage 12.
You can use pipes with wall thickness up. It does not need a little distance. So if this work can be used to pipe thickness is 0.014 ", it is possible to produce a coil spacing is 12 FPI.