What inspections are required after cnc precision machining?

3 axis cnc machining fixture

4 axis cnc machining fixture

No matter for what precision machining parts after production.  We must measure all dimensions in production, not only to check the last process but also to improve the quality of parts. In conclusion, the most important is to provide a final inspection report to customers.

1>. Outer diameter

When measuring the outer diameter. Of course, we need to measure and record both parts of the week. When the precision machining part with the diameter length is greater than 50mm. It should have a straight line check. So the use of the knife ruler face and the outer diameter bus contact. Observe the width of the building, and then judge against the standard light gap.

2>. Inner diameter

When measuring the size of an internal diameter in a precision machining part, just take three parts in the week and record it. When the same diameter length is greater than 40mm, first check the cylindrical degree. Within the direction of the same diameter length, It should obtain two positions of large intervals for measurement. Calculate the cylindrical error.

3>. Length

External thread measurement: the outer thread diameter with thread ring gauge or three-pin measurement, the path with the thread ring rule (general rule) detection. Internal thread measurement: the inner and outer diameter with thread plug gauge (general rule) inspection.  The middle diameter with thread plug gauge inspection. The large, medium and trail of the thread follow the precision level requirement by the pattern. Effective length tolerance of thread: executing as a requirement in fastener inspection specification.

4>. Surface roughness detection:

The comparison method of the sample block is also used for comparison.

5>. Flatness test:

Using the metering method detection, and then place the plate three adjustable support. The part measurement face placed upward on the support point, adjust the support point. So that three points and so high, the peak and valley value measured by the gauge is the plane’s flatness error.

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