Correct use of precision measuring tools is one of the important conditions to ensure product quality. To maintain the accuracy of the measuring tool and its reliability, in addition to the use of reasonable methods to operate, but also must do a good job of measuring tool maintenance and maintenance work.

1. When measuring parts on the machine tool, it is necessary to wait for the parts to stop completely, otherwise not only the measuring surface of the measuring tool will be worn prematurely and lose accuracy, and it will cause accidents.

2. Before measurement, the measuring surface of the measuring tool and the measured surface of the parts should be wiped clean, so as not to affect the measurement accuracy due to the presence of dirt. With precision measuring tools such as calipers, micrometers and dial gauges, to measure the forging blank, or with abrasive agents (such as emery, etc.) on the surface is wrong, so easy to make the measuring surface quickly wear and lose accuracy.

3. During the use of measuring tools, do not pile them together with tools, tools such as files, hammers, turning tools and drills to avoid damaging measuring tools. Also do not casually put on the machine tool, avoid the vibration of the machine tool and make the measuring tool fall down damage. In particular, calipers should be placed in a special box to avoid deformation of the ruler body.

4, measuring tools are measuring tools, absolutely can not be used as a substitute for other tools. For example, using a caliper to line, using a steel ruler as a screwdriver screw, and using a steel ruler to clean chips are all wrong. The measuring tool as a toy, such as the caliper in the hand arbitrary waving or shaking is also wrong, it is easy to lose precision measuring tools.

5, the temperature has a great impact on the measurement results, the precision measurement of parts must make the parts and measuring tools are measured at 20℃. Generally, it can be measured at room temperature, but the temperature of the workpiece and the measuring tool must be consistent, otherwise, due to the thermal expansion and cold contraction of metal materials, the measurement results are not accurate. The temperature also has a great influence on the accuracy of the measuring tool. The measuring tool should not be placed in the sun or on the bedside box, because the correct size will not be measured when the temperature of the measuring tool increases. Do not put the precision measuring tool in the heat source (such as electric furnace, heat exchanger, etc.) near, so as not to make the measuring tool heat deformation and loss of accuracy.

6. Do not put the precision measuring tool near the magnetic field, such as the magnetic workbench of the grinder, so as not to make the measuring tool feel magnetic

July and found abnormal phenomenon, precision measuring tools such as measuring tool surface uneven, burr, rusty spot and inaccurate calibration, feet and not flexible bending deformation, activity, etc., should not be the user's own repairing, more does not allow to use hammer, file file, emery cloth, polishing rough way to repair, to avoid instead of increasing the measuring error. If the above situation is found, the user should take the initiative to send it to the measuring station for maintenance, and continue to use it after checking the quantitative accuracy.

8, after the use of measuring tools, should be timely wipe clean, in addition to stainless steel measuring tools or protective coating, metal surface should be coated with a layer of antirust oil, placed in a special box, stored in a dry place, so as not to rust.

9. Precision measuring tools should be regularly verified and maintained. Precision measuring tools used for a long time should be regularly sent to the measuring station for maintenance and accuracy verification, so as to avoid product quality accidents caused by out-of-tolerance error of measuring tools.