Measurement accuracy in CNC machining

The growing demand of the industry for details of often small sizes and many details has made the CNC machining technology in recent years the most often and most willingly used in their production. The more so as it allows for the shaping of not only steel and wood, but also plastics such as plexiglass, solid polycarbonate or dibond. In this article on our blog, we describe, among others advantages of CNC cutting, and among the many advantages of this method, we mention high measurement accuracy.

What is measuring accuracy and why is it one of the most important determinants of precision machining quality? About it later in the text.


Accuracy in precision machining

The mentioned accuracy, which can be divided into measured and performed accuracy, is one of the terms commonly used in metrology. In precision machining, this parameter refers to the actual values ​​of the manufactured detail in relation to those assumed and expected in the project. It determines the quality of the finished selection and can be defined as high or low.

The term of measurement accuracy is also related to the concept of IT tolerance classes, i.e. the adopted limit values ​​(upper and lower) which constitute the approval of the detail by the quality control department. The difference between the assumed and actual values ​​is a key parameter in serial production of details. The smaller it is, the higher the quality of the detail is obtained, which is achieved by programming the operation of each numerically controlled machine.

What determines the accuracy of the measurement?

Although the CNC technology is perfect for keeping the values ​​specified in the table of IT tolerance classes, due to the number of events taking place within the machine mechanism in the machining process (stroke, pulses), the actual parameters obtained may fluctuate. Another reason for the differences between the actual and assumed values ​​may also be a measurement error resulting, for example, from incorrectly calibrated tools. At Pleximade, however, we always make sure that the acceptable dimensional limits are maintained for each detail made, which is definitely helped by many years of experience, professional knowledge and a well-equipped machine park.


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