Threading is one of the most automated programming tasks in modern machine shop, yet it could be one of the more difficult operations done on CNC lathes. At first look, it may seem an easy procedure to make a program for tool-path that has all cutting parameters clearly defined, such as threading. Practical applications, however, could present a big departure from theory. This comment may be arguable, at least until it is time to start searching for solutions to unusual threading problems or even regular threads that 'just don't seem to be coming out right'. An experienced programmer should have the ability to think of yet another solution, when all other solutions seem to have been used up. Such approach is the key to any problem solving and applies equally to threading problems.

What often causes threading to be a difficult operation is the cutting tool application. Single point threading tool is unlike any cutting tool. Although threading tool holder is mounted in the turret just like other tools, thread cutting insert is unique. Threading tool does not only cut, it also forms the thread shape. Typically, any threading insert will have the shape of finished thread. Mounting a threading tool in the turret can be done at 90 to - or parallel with - the machine spindle centerline, regardless of the thread being cut. Decision which way to mount the tool is determined by the thread angle, relative to the spindle...