During the inspection, paper jams and lamp jams should be avoided, not hard paper jams. Certainly, that is to say, when checking the gauge, the position must be placed upright and not inclined, otherwise the check result will be unreliable. Cold means that the inspection can only be performed when the temperature of the inspected workpiece and the instrument are the same and the workpiece that has become hot after processing cannot be inspected. The precision workpiece should be isothermal with the gauge. All, that is, the inspection of the workpiece by the gauge must be comprehensive. In order to obtain correct and reliable inspection results, the straight end of the plug gauge must be inspected over the entire length of the hole, and the inspection must be performed in 2 or 3 axial planes; the plug gauge must be inspected as much as possible at both ends of the hole The end. The straight end and stop end of the gauge shall be inspected at no less than 4 positions along and around the axis. 5. If the plug gauge is stuck in the workpiece hole, it cannot be hit with an ordinary hammer, twist or break the plug gauge with a wrench, otherwise the working surface of the plug gauge will be damaged. At this time, please use wood, copper, aluminum hammer or fitter's disassembly tool (such as puller or pusher), and pad a piece of wood or copper on the end face of the plug gauge. Protect it, and then pull it out or push it out. If necessary, the outer surface of the workpiece can be slightly heated, and then the plug gauge can be pulled out. 6. When the workpiece clamped on the machine tool is still running, the gauge cannot plug it. 7. Do not use gauges to check workpieces with rough surfaces and unclean surfaces. 8. The penetrating end of the gauge must pass through each qualified workpiece, and its measuring surface is often worn. Therefore, the gauges need to be checked regularly. For working gauges, when the plug gauge approaches or exceeds its minimum limit, and when the through end of the caliper (ring gauge) approaches or exceeds its maximum limit size, the workpiece gauge should be replaced with an acceptance gauge for use. When the acceptance gauge approaches or exceeds the wear limit, it should be immediately scrapped and stopped using it. 9. Use the photometric limit meter to check the workpiece. If it is determined that there is a dispute, the following size table should be used for inspection;
