How to operate the pass rule?

Through gauge, that is, the lower limit of the allowable deviation of the aperture. If it cannot pass, it means that the aperture is small and unqualified. Stop the gauge, which is the upper limit of the allowable deviation of the aperture. If the stop gauge can pass, it means that the aperture is large and unqualified. Exceeding and stopping rules is not considered qualified. When a large number of inner circle parts are processed, in order to facilitate the related information, a kind of gauge is used, that is, through gauge and stop gauge. The pass gauge and the stop gauge are made on a cylinder, the long end of the pass gauge can pass through the hole, and the short end of the gauge can not pass through the hole. If the stop gauge can be smoothly screwed into the tested threaded hole 2.5 turns or more, it will be unqualified and otherwise qualified. At this time, the unqualified threaded hole should be scrapped and cannot be reworked.

Extended information:

Precautions:

1. The measuring tool should be measured once every working day with the proofreading plug gauge. After proofreading, the ring gauges that are out of tolerance or that have reached the weekly inspection period of the measuring instruments shall be taken back by the measurement management personnel, marked and isolated, and corresponding treatment measures shall be taken.

2. After the adjustable thread ring gauge is adjusted, the measuring part will be out of round. This phenomenon will be measured and appraised again by the measuring repair personnel after thread grinding, and the size can be put into use only after it is qualified. Discarded ring gauges shall be identified and isolated and disposed of in a timely manner, and shall not flow into the production site.

3. After the measuring tool (ring gauge) is used, the attachments on the measuring part should be cleaned up in time and stored in the specified measuring tool box. At the production site, the measuring tools should be placed in a fixed position in the process, and handled gently to prevent bumps and damage to the measuring surface.