FAQ - CHUAN HONG Precision Tool Specialist
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How to accept the new products of Thread Ring Gauge ?
When a new product enters the factory, you can check whether the measured data of the CERTIFICATE(=inspection score sheet) attached to the product is in the tolerance. within standard tolerances. Thread bolt gauge can be used to measure the outer diameter of the external centimeter or use a three-wire gauge to measure and calculate the actual data of the effective path is used to determine whether to accept or not.
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What should I do if the result is different from the data on the CERTIFICATE (=inspection score sheet) during the in-house self-inspection of the thread plug gauge ?
If the measurement method is the same but the results are different, the main reason is the measurement error.
Differences such as difference, environment, etc. may lead to different measurement results; The Standard gauges can be used to compare and supplement positive, can reduce the measurement error. -
The inspection result table of the thread ring gauge is to display the data of the inspection gauge, and send it to an external Calibration Laboratory to obtain the direct measurement value result. If it's not within the standard range ?
There are many measurement methods, and the results obtained by each different method will have errors.
For other measurement errors above, the difference is larger; according to the requirements of the specification, the measurement method of the thread ring gauge should use the checking gauge Standard measurement, if the direct measurement result cannot be within the standard range, it can be determined according to the acceptance standard set by the factory.
Whether the ring gauge is qualified or not can be judged whether the ring gauge is acceptable or not. -
What is the difference between the direct measurement of the internal thread and the measurement result of the inspection gauge ?
The calibration data measured directly should be selected by a calibration laboratory that has passed the accreditation of the certification unit, and can be calibrated
The calibration range of this product specification shall prevail, and the calibration master standard and method of each calibration laboratory are not necessarily the same, and the results will be different when the calibration data are produced by different calibration laboratories.
Acceptable within the range that covers the uncertainty of the laboratory. Checkpoint measurement is a direct contact.
Measurement, the thread ring gauge is also a direct contact measurement when inspecting the workpiece, and this method has a normative basis, so the checking gauge measurement is more practical, and it is not recommended to only refer to direct measurement data as a single acceptance criterion.