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CNC Prototype Machining: 5 Reasons Affecting CNC Prototype Machining Accuracy

41   |   Published by VMT at Jul 25 2022



CNC prototype has high machining accuracy, can accurately control product quality, and has high production efficiency. It is a CNC prototyping method commonly used by many large CNC prototyping machining factories. However, there are still differences in the machining accuracy of CNC prototypes. The reasons for this can be analyzed from the following aspects.







1. Dimensional Accuracy


Refers to the degree of conformity between the actual size of the CNC prototype machining part and the center of the tolerance zone of the part size. Dimensional accuracy is controlled by dimensional tolerances. Dimensional tolerance is the allowable variation in part size during machining. In the case of the same basic size, the smaller the dimensional tolerance, the higher the dimensional accuracy.




2. Shape Accuracy


Refers to the degree of conformity between the actual geometry of the surface of the CNC prototype machined part and the ideal geometry. There are six items for evaluating shape accuracy, including straightness, flatness, roundness, cylindricity, and line profile. The shape accuracy is controlled by the shape tolerance. The shape tolerances are divided into 12 precision levels except for roundness and cylindricity, which are divided into 13 precision levels. Level 1 is the highest and Level 12 is the lowest.




3. Position Accuracy


Refers to the actual positional accuracy difference between the relevant surfaces of CNC prototype machining parts. There are eight items for evaluating position accuracy, including parallelism, perpendicularity, inclination, coaxiality, symmetry, position, circular runout and full runout. The position accuracy is controlled by the position tolerance, and the position tolerance of each item is also divided into 12 accuracy levels.




4. Knives


The knives used in CNC prototype processing machines are generally tungsten steel knives. Generally, after using this knife several times, the knives will wear out, so there are also errors in the knives.




5. Manual Tool Setting


If there is a tool setting instrument, there will be no problem in tool setting. However, in order to save costs, many small CNC prototyping factories will choose no tool setting instrument when choosing a machine, and only manual tool setting, so there are tolerances in personnel. In order to ensure the accuracy of the CNC prototype processing model, installing a tool setter on the CNC prototype processing equipment can not only accurately set the tool, but also greatly improve the work efficiency.




The above are the 5 aspects that affect the machining accuracy of CNC prototypes. The influence of various aspects will lead to differences in the accuracy of the final CNC prototype machining model. Therefore, we must start with the machining accuracy of each aspect to produce CNC prototype machining that can achieve the best results. Model.




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