How do Interpretation of CNC machining precision of precision parts?

We deal with different the processing of precision parts every day. In the process of quoting to customers, we often mention the precision. Some customers think ±0.05mm, while others think ±0.005mm. How do you do understand?

    Zhuanxin Precision Hardware Co.,LTD thinks: in doing the process of the CNC precision parts, CNC machining precision refers to the actual size, shape, position and other data of the machined surface of the parts to conform to the ideal parameters required by the drawings. For size, the ideal geometric parameter is the average size; For shape, it is absolute circle, cylinder, plane, cone, straight line, etc. For mutual position, it is absolutely parallel, vertical, coaxial, concentric, symmetrical and so on.

1.Dimensional accuracy

The degree of conformity between the actual size of the machined part and the tolerance zone center of the part size.

2. Shape accuracy

The degree of conformity between the actual geometry in the machined part surface and the ideal geometry.

3. Position accuracy

The accuracy difference between the actual position accuracy and the relevant surfaces of the machined parts.

4. Mutual relationship

    When designing a CNC precision parts and setting accuracy of machining precision, we should pay attention to control the shape error within the position tolerance and the position error less than the size tolerance. That is to say, precision parts or important surface of parts, their shape precision requirements should be higher than the position precision requirements, and the position precision requirements should be higher than the size precision requirements.

The precision of precision parts is measured by tolerance grade. The grade is smaller, the precision is higher. And the machining error is represented by numerical value. The numerical value is bigger, the error is greater. So high machining accuracy means small machining error, and vice versa. The actual parameters obtained by any precise part machining method are not absolutely accurate. From the view of the part's function, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy is considered to be guaranteed.

Zhuanxin Precision Hardware Co.,LTD has rich experience in precision metal parts processing, so if you have any question about precision metal parts processing, you are welcome to inquire at any time.

Tel: +86 769-81553687 or Skype/Wechat/Phone: +86 136-5018-1780

Editor: Aamenda Her

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