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CNC lathes have the function of arc interpolation, so they can directly use arc commands to machine arc contours. CNC lathes can also process contour rotating parts composed of any planar curve, which can be described by equations or list curves. If both traditional lathes and CNC lathes can be used for turning cylindrical and conical parts, then CNC lathes can only be used for turning complex rotating parts.

How to Machine Multiple Threads on CNC Lathes
The two main methods for machining multi thread threads on CNC lathes include:
Circumferential line division method: This method uses the spindle encoder on a CNC lathe to perform thread cutting on the starting point pulse. During the cutting process, feed through different angles. The encoder rotates 360 ° and is fed in three lines, which means the feed starts when it rotates past 120 °. This method is relatively simple and has no limitations in its application, but there are also corresponding shortcomings, such as some CNC systems not supporting it, making it difficult to use.
Axial dividing line method: This method is the same as the small sliding plate dividing line used in horizontal lathes to process multi line threads, as long as the coordinates of the starting point are changed, it can be used. Simply put, during the processing of the second helix, there is a difference in pitch in the direction of the starting point of the first helix. During the specific programming process, the tool is moved towards the Z direction, similar to the process of machining other spiral lines. This method is relatively easy to use and is not limited by the CNC system. It can perform multi thread machining and reduce programming workload by using cyclic instructions.

The threads that traditional lathes can cut are quite limited. They can only process straight, tapered, and imperial threads with equal pitch, and a lathe is limited to processing several types of pitch. CNC lathes can not only process any equal pitch straight, conical, metric, imperial, and end face threads, but also can process increased pitch, decreased pitch, and threads that require smooth transitions between equal pitch and variable pitch. When CNC lathes process threads, the spindle rotation does not need to alternate like traditional lathes. It can cycle one tool after another without stopping until it is completed, so its efficiency in turning threads is very high.
High speed and high precision not only refer to the machining speed of CNC machine tools for workpieces being high and fast, and the precision of produced products being higher, but also require CNC machine tools to work at high speed and accurately position during the entire process of workpiece processing, in order to reduce the time occupied by workpieces in various stages such as preparation, processing, transportation, and storage, summarize the output power of the factory, and reduce production costs. Higher precision mechanical products will bring more benefits in practical application, such as reducing conflicts and heating during the work process, reducing power loss, making the overall operation more stable and stable, and reducing the incidence of defects.
The drag plate transmission screw of the CNC lathe is a high-precision ball screw, and the transmission gap between the screw and the nut is very small, but it does not mean that there is no gap. As long as there is a gap, when the screw moves in one direction and then drives in the opposite direction, it is inevitable to produce a reverse gap, which will affect the machining accuracy. On the other hand, the inclined bed CNC lathe has gravity, which directly acts on the axial direction of the screw, The reverse clearance during transmission is almost zero.
The linear rolling guide rail of the inclined bed CNC lathe meets the requirements of high speed and efficiency, reduces frictional resistance and temperature rise deformation, improves machining accuracy, and can maintain long-term stability of cutting accuracy. The inclined bed CNC lathe belongs to the versatile precision CNC lathe, with high precision, flexibility, durability, generous appearance, and strong practicality. It has multiple advantages of a tool walking machine and a center walking machine. The inclined bed CNC lathe is mainly used for multi variety, medium and small batch processing of precision and complex various rotating parts.