Just a quick overview of threading wizards.
There are three threading wizards for Turn as shown by the attached pics.
Actualy two since  the Complex Threading Wizard  is not really supported and Brian would like to see it 
declared a myth. 

  The complex wizard is just that, namely very complex in that it tried to provide  three pass types along with 
three cut types and two infeed types  and additionly many different types of threads.I believe there are some bugs in it,
 but frankly if it all worked i would probably use it. Not for a novice and unless fixed ,tested, and 
documented ......... don't think it should be considered for the new lathe screen. 
The G76 thread calculator is included a Mach installation.
The Simple threading wizard and Quick threads are somewhat similar with Quick threads providing more options.
The user has choice on which wizard to use via selection in the  Wizard Tab. 
RICH