How To Test The Precision CNC Machining Parts ?

- Mar 09, 2020-

During processing, it is normal for the problem to occur, but it will be resolved in time, but sometimes, some failures will not be found, so it will be found during later use. So many users are choosing It is very important to learn how to inspect the product at that time. If you find the problem after buying it back, some businesses are not responsible for it. Then let's find out what are the methods of inspecting precision machining?


Precision machining

1. Measuring method of outer diameter

When measuring the outer diameter, it is necessary to measure and record at two locations in the circumferential direction. When the part with the same diameter and length is greater than 50mm, the straightness check should be made. The working surface of the knife edge should be in contact with the outer diameter bus bar. Observe the breadth of the building and then judge against the standard light gap


2.Measurement method of inner diameter

When measuring the inner diameter of a part, it is only necessary to measure at three locations in the circumferential direction and make a record at the same time. When the length of the same diameter is greater than 40mm, a cylindricity check should be performed, and within a range of the length of the same diameter, two positions with larger intervals should be obtained for measurement. Calculate the cylindricity error.


3.Measurement method of external thread

The middle diameter of the external thread is measured by a thread ring gauge or three needles, and the small diameter is detected by a thread ring gauge (general gauge).

Precision machining


4.Measurement method of internal thread

The outside diameter of the internal thread is checked with a threaded plug gauge (general gauge), and the middle diameter is checked with a threaded plug gauge.


5.Surface roughness testing

The sample comparison method is used for comparison and judgment.


6. Inspection of flatness

Using the meter test method, three adjustable supports are placed on the plate, and the part is placed on the support point with the measurement surface facing up. The support points are adjusted so that the three points are equal in height. The peak and valley values measured by the meter are flat. Flatness error.


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