Linear bearing is a linear motion system produced at low cost. It is used in conjunction with cylindrical shaft for infinite stroke. Because the load ball is in point contact with the shaft, the use load is small. The steel ball rotates with very little frictional resistance, so that it can obtain high-precision and smooth movement. Linear bearings are widely used in electronic equipment, tensile testing machines and digital three-dimensional coordinate measuring equipment and other precision equipment, as well as multi-axis machine tools, punches, tool grinders, automatic gas cutting machines, printers, card sorters, food packaging machines and other industrial machinery component. Take the mechanical laboratory as an example. Under normal circumstances, the ambient temperature of the testing machine is required to be (10 ~ 35) degrees Celsius. If the temperature is too high or too low, it will affect the operation of the testing machine. When testing the strength of cement, it is required that the ambient temperature is (17-25) degrees Celsius, which requires the mechanics room to take certain temperature control measures, especially in the winter and summer seasons. Some testing agencies do not consider the temperature requirements of the mechanics room. There are also some testers who ignored the temperature requirements of the tested materials during the test, such as the temperature requirements of the mixing water (directly using tap water) during the molding of the cement mortar strength test block, and the temperature requirements of the sample itself. (In the waterproof coil tensile test, the sample was not left at room temperature for 25 degrees Celsius for a period of time, but the test was performed directly.) If the environmental conditions of the laboratory or the temperature of the material being tested cannot meet the testing requirements during the testing process, it is difficult to ensure the accuracy and reliability of the measurement data.
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