Methods For Inspecting Precision CNC Machined Parts

- Jan 09, 2020-

During processing the precision metal parts, 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 merchants are not responsible. 

Then let us know what are the methods of inspecting precision CNC machining ?

Precision CNC-machining parts:

1.Measurement method of outer diameter

When measuring the outer diameter, it is necessary to measure and record in two places in the circumferential direction. When the part with the same diameter and length is greater than 50mm, a straightness check should be performed. The working surface of the knife edge rule is used to contact 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 in three parts 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 with a thread ring gauge or three needles, and the small diameter is detected with 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 parts are placed on the support points 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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