1. Before measuring, the measuring surface of the measuring tool and the surface to be measured of the part should be wiped clean to avoid the influence of the measurement accuracy due to the presence of dirt. It is wrong to use a precision measuring tool to measure the blank of forging and casting, or the surface with abrasive , it is easy to cause the measuring surface to wear quickly and lose accuracy.
2. During the use of the tool, do not stack it with tools, knives such as files, turning tools and drill bits to avoid bumping the measuring tool and do not place it on the machine tool casually, so as to avoid the measuring tool falling off due to the vibration of the machine tool and being damaged. After use, it should be flat. Put it in a special box to avoid making the ruler shape.
3. It is wrong to use a measuring tool as a substitute for other tools. For example, it is wrong to take a ruler to draw a line and use a steel ruler to clean up the chips.
4. The temperature has a great influence on the measurement results. Precision measurement of parts - must make the parts and measuring tools to be measured at 20 degrees Celsius. Generally, the measurement can be carried out at room temperature, but the temperature of the workpiece and the measuring tools must be adjusted. Otherwise, due to the metal The thermal expansion and contraction characteristics of the material make the measurement results inaccurate.
5. Do not put the measuring tool near the magnetic field, such as a magnetic workbench for grinding, so as to avoid magnetic induction.
6. When abnormal phenomena are found, such as uneven surface, burrs, rust spots, inaccurate scale, bending and deformation of the ruler body, inflexible movement, etc., the user cannot disassemble and repair it by himself, so as to avoid increasing the error.
7. After using the tool, it should be wiped clean in time. Except for stainless steel measuring tools or protective coating, the metal surface should be coated with a layer of anti-rust oil, placed in a special box, and stored in a dry place to avoid rusting.
8. The precision measuring tools should be checked regularly to avoid product quality accidents caused by the error of the measuring tools being out of tolerance.
