How to conduct regular self inspection or third-party verification of the flatness of cast iron fixed plates?

How to conduct regular self inspection or third-party verification of the flatness of cast iron fixed plates?

Regular self inspection is the key to internal monitoring, used to quickly detect significant accuracy degradation. The most effective method is to use an electronic level in conjunction with a bridge plate to measure and calculate the flatness error along a grid like path. Precision blade rulers and feeler gauges can also be used for quick visual inspection. The self inspection frequency should be set according to the usage intensity, and it is recommended to conduct it once every quarter for key workstations. The change trend should be recorded and compared with the initial data.

Third party authoritative verification is a necessary means of legal calibration and traceability, usually used for annual calibration or acceptance disputes. It is necessary to entrust a metrology institution with CNAS/CMA qualifications to conduct comprehensive testing using high-precision equipment such as laser interferometers in accordance with the national standard JJG 117-2013 "Flat Plate Calibration Regulations". The institution will issue a legally binding calibration certificate, clearly stating the flatness error value and the conclusion of whether it meets the nominal accuracy level.

It is crucial to establish a scientific testing cycle and strategy. Combining self inspection monitoring with annual or biennial third-party verification is the most cost-effective approach. If self inspection reveals an accelerated decline in accuracy, or if the platform experiences relocation or significant impact, third-party verification should be immediately initiated. All verification records must be archived as the core basis for platform accuracy status and product quality traceability.