1. Accurate measurement: Lay the foundation for a tight fit
Dimension measurement is the first step before assembly and is the key to ensuring that the pulley fits perfectly with other components. Before preparing for assembly, technicians need to use high-precision measuring tools to conduct detailed dimensional inspections of all relevant components. This includes but is not limited to key dimensions such as the pulley's diameter, thickness, and aperture, as well as the dimensions of other components that fit with it (such as shafts, bearing seats, etc.). Through accurate measurement, the fit clearance between the pulley and other components can be evaluated in advance, thereby avoiding assembly problems caused by dimensional mismatch.

Pulley size measurement: Accurate measurement of the pulley diameter helps determine its position in the transmission system to ensure that it is not too large or too small to affect the transmission efficiency. The measurement of thickness is related to the strength and durability of the pulley, as well as the space allocation between it and other components (such as the deck). The measurement of the aperture is to ensure that the pulley can be tightly and firmly mounted on the shaft to avoid shaking or falling off during rotation.
Measurement of other component dimensions: In addition to the pulley itself, it is also necessary to measure the dimensions of other components that match it, especially the diameter and length of the shaft, and the internal dimensions of the bearing seat. The accuracy of these data is crucial to ensure that the pulley can be installed correctly and operate stably.
2. Positioning marks: an effective means to improve assembly accuracy
In complex assembly processes, positioning marks are like lighthouses that guide the direction of assembly, which can significantly improve the accuracy and efficiency of assembly. By making positioning marks on pulleys and other key components, technicians can more intuitively determine the installation position and direction of the pulley to ensure that it can accurately align with the axis or interface of other components during the assembly process.

Pulley positioning marks: The position of the axis or the installation direction can be marked on the outer edge or side of the pulley with a non-fading marking pen or engraving tool. In this way, the correct installation posture of the pulley can be quickly identified during assembly to avoid installation errors.
Other component positioning marks: Similarly, corresponding positioning marks can be made on components such as shafts and bearing seats, such as the center line mark of the shaft, the installation position mark of the bearing seat, etc. These marks can help technicians quickly locate during the assembly process and ensure accurate alignment between components.
3. Precautions in assembly practice
In addition to following precise measurements and positioning marks, the following points should be noted during actual assembly:

Cleaning and lubrication: Before assembly, all parts should be thoroughly cleaned to remove impurities such as oil, dust, etc. to ensure the cleanliness of the assembly surface. At the same time, proper application of lubricant can reduce friction and improve the smoothness of assembly.
Step-by-step assembly: Follow the principle of assembling from inside to outside and from small to large, and ensure that each step meets the design requirements.
Inspection and adjustment: After assembly, a comprehensive inspection should be carried out to confirm whether the pulley and other parts are tightly matched without looseness or abnormal sound. If necessary, fine-tuning can be performed to ensure the best fit.