I've watched all the videos and read the Manuals but I can't find anything that explains how to know what length lead in I should be useing or when to use a are, line or on line lead in?
With an online tool path there is no lead-in, with a male or female tool path it is to your choosing make the leadin as long as you want as long as it fits within the object, a 1/4" circle obviously wont fit a .25 lead in.
I use a .125 leadin on most jobs, but when i can i use a lager one . I will almost always go over leadin with a fine tooth comb. and you can edit a leadin with node edit