The Processing of the Pain Axis
Source: Bearing Network | Date: June 8, 2014
The pain axis is a critical component in precision machining, particularly for parts that require high accuracy and consistent alignment. This type of axis typically involves two B and C reference outer circles, along with an A-reference outer circle, all aligned in the same direction. The degree of misalignment can vary, but generally, the error should be kept below 0.05mm to meet standard requirements. To achieve this level of precision, careful planning of the machining process is essential. The first step is to process all the outer surfaces referenced to the A-axis. At both ends of the shaft, a chuck with dimensions of 50mm and 25mm is left for subsequent operations. These chucks must maintain coaxiality with the A-reference and ensure that the step surface is straight relative to it. Next, the two ends of the shaft are milled into flat surfaces with a tolerance of 42h6, as shown in Figure 1. The flat surface must be symmetric with respect to the A-reference and parallel on both ends. For tooling, two clamping cans are used, as illustrated in Figure 2. The groove (42H7) must be symmetrical with the central hole B5, and the end face of the groove should remain perpendicular to the center hole. These cans are mounted on both ends of the shaft. The direction of the cans must be aligned, and the grooves must fit precisely with the 42H7/h6 flat surface of the shaft. By adjusting the compression screws on the cans, the amount of clamping force can be controlled, ensuring that the end face of the can presses firmly against the step surface of the shaft. This guarantees that the center of the shaft remains parallel to the center of the can. During the lathe operation, double-clamp clamping is used, allowing the four-jaw chuck to rotate freely. The A-reference two-head outer circle is measured using the table, and the screws on the can are adjusted accordingly. Once the desired clamping force is achieved, each pain point is turned to the required scale. Finally, the two process chucks are cut off after the machining is complete. This method is not only simple and reliable but also eliminates the complexity of traditional processing methods, such as dealing with the middle hole of the trampoline. It is especially suitable for multiple pain axes that require consistent alignment and precision in the demand direction. This approach improves efficiency and reduces errors, making it ideal for modern manufacturing environments where high-quality and repeatable results are essential.
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