Fast sorting needle roller method

Needle roller bearings are mounted in many places in the wheel loader wheel reducer. In order to ensure a long service life of the needle roller, the needle roller must be assembled in groups. That is, the needles (total of 31) installed between each set of holes and the shaft have a diameter difference of a maximum allowable value of 0.005 mm. According to the national standard GB309-84, the manufacturing tolerance of the needle roller diameter is 0.01mm larger than the allowable value. Therefore, the purchased standard needle roller cannot meet the assembly requirements. An effective way is to group the needles before assembly.

Hardness Tester

Hardness testers use a differential-depth method. The test consists of placing an on the material, then applying a minor load, which establishes the zero position. After the minor load, a major load is applied and then removed while the minor load is maintained.

Hardness Tester Calibration Calibrating Most Types and Models. Hardness Tester Calibration should be performed on a periodic basis to verify that the accuracy of the instrument is within the manufacturer`s stated tolerances for the grade or model. As a hardness tester repeatedly measures the relative resistance of materials to denting, bending, or scratching, it can become misaligned. hardness tester is a compact device and occupies minimal bench space. A hardness tester commonly constitutes a tester assembly joined to a frame assembly. The tester assembly is made up of a tester enclosure that supports a motor that drives to connect with a load unit and an indentor.

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