The accuracy of CNC machining parts depends on many factors, including part design, tool selection, tool path programming, fixture fixing method, and so on.

Different industries have different requirements for the accuracy of parts, such as medical, aerospace, automotive, chemical, and other industries. Of course, many other industries also have high requirements for the accuracy of parts. Some industries do not have high requirements for the accuracy of parts. They pay more attention to the stability of the accuracy of parts, the size difference between parts should be as small as possible.

01. How to ensure the accuracy of parts in a CNC processing factory?

1. CNC milling machine accuracy: 3 measurements

The overall accuracy of the milling machine is determined by three different measurement values: position accuracy, repetition accuracy, and tolerance.

2. Position accuracy

The position accuracy is equal to the difference between the distance between the specified points on the part and the actual measured distance of these points after milling. For CNC milling machines, the accuracy depends on the ability to follow the programmed path. The processing plant determines the position accuracy of the milling machine by repeatedly measuring and calculating the statistical average of the deviation.

3. Repetition precision

Define the accuracy of the milling machine by precisely repeating the same commands, to obtain the same results one by one. Similar to the accuracy, the accuracy of the CNC milling machine is calculated through multiple measurements when setting the cutting path. The measurement standard of precision is the repeatability of the same path of cutting, resulting in the repeated and accurate replication of parts.

4. Tolerances

The goal of CNC milling machines is to keep them within the specified tolerance range by repeatedly maintaining high positioning accuracy. For example, imagine shooting an arrow at a target. The distance between the arrow and the bull's eye measures accuracy.

02. How to judge the accuracy of CNC machining

To maintain the required accuracy of parts, a good machining plant gives priority to the following items in its processes and procedures:

1. Working environment

Accuracy depends on the working environment providing stable conditions, such as temperature and humidity.

2. Equipment status

The accuracy of the CNC milling machine needs continuous preventive maintenance to keep all equipment in perfect working condition.

3. Machine calibration

The machine periodically recalibrates all precision milling machines to maintain factory settings.

4. Tool monitoring

Monitor the cutting tools, and maintain and replace them according to their status.

5. Fixture

To minimize the impact of vibration, it is necessary to use a suitable fixture to fix the workpiece.

6. Mechanic experience

Experienced mechanics are more likely to understand the subtle differences that lead to the manufacture of precise parts.

7. Programming

Experienced manufacturing engineers know how to use different tools with different methods and speeds to effectively manufacture accurate CNC milling machine parts.