CNC machining and conventional machining aim to achieve the same end, and both start with a raw chunk of metal or plastic and shape it into a part. “CNC machine is having higher productivity than general lathe machine” because the most basic difference between the two is the automation of CNC versus the manual nature of conventional lathe machine. With CNC, a skilled employee programs software to cut the part. With conventional, a skilled employee takes all the steps to setup and operate the machine. In the manual situation, a highly skilled operator must also set the gears, whereas CNC machining does not use gears. Imagine a hypothetical part, for example. A component needs concave and convex arcs, imperial and metric threads and two tapers of differing degrees. An automated CNC machine would use three tools to cut the part, while the conventional machine would require five tools and no doubt more time.