The cutting tools used in the machining of precision part plates are relatively expensive. For example, the body of a face mill with a 100mm bore is estimated to cost several thousand yuan, so they should be chosen carefully. Many workers involved in the machining of precision part plates have encountered such small but challenging problems.So how should we handle such situations?

    The process of precision part plate machining does not require continuous operation of the CNC machine as traditional machining equipment does. Instead, it involves controlling various functional components of the CNC machine to perform complex and precise movements, thereby completing the machining process with high accuracy and efficiency. 

    The process flow programming of machining is crucial for the processing of precision part plates. If the program is not written scientifically or the basic parameters are unreasonable, it will adversely affect the machining accuracy and machining efficiency of the workpiece, such as causing excessive cutting. Excessive cutting is a relatively serious problem in the machining of precision part plates.

   When the situation is not optimistic, it can lead to workpiece scrapping. If front-line machining staff are prone to writing machining programs with excessively small cutting parameters due to various reasons when programming CNC lathes, the management system can issue an early alarm in the work process, thereby preventing the occurrence of small cutting accidents.

   How can we determine the cause of 'cutting small' in precision part plate machining? 

1. Cutting small pieces after curved processing in precision part plate machining

    if the selected CNC tool tip radius rD is too large and exceeds the required arc radius R to be machined, cutting small is likely to occur. The machining program for precision part plates is compiled based on the actual contour path of the workpiece, without considering the tool path movement during actual machining. Due to the existence of the tool radius, the actual tool path becomes thicker and does not overlap with the programmed path. To obtain the correct workpiece surface contour, a tool radius compensation command must be set between the tool path and the programming path. Otherwise, cutting small of the workpiece will  be inevitable.

2. Distinguishing the small cutting marks after parallel line processing

    When cutting product workpieces composed of straight line segments during the processing of precision part plates, if the radius of the CNC tool is too large, it is highly likely to result in under-cutting, which will then cause the workpiece to be scrapped. It is best to adopt a program that can determine by the sign of the scalar product of the vector to be passed and its corresponding adjusted vector.