The Processing of the Pain Axis
Source: Bearing Network | Date: June 8, 2014
The processing of a pain axis involves precise manufacturing techniques to ensure accuracy and alignment. This type of axis typically requires two B and C reference outer circles, along with an A-reference outer circle, all aligned in the same direction. The degree of deviation is different for each part, and the required tolerance is usually within 5mm, with a maximum allowable error of less than 0.05mm. To meet these specifications, a detailed process plan and specialized tooling are essential. Firstly, the A-reference outer circles are machined. At both ends of the shaft, a chuck of 50mm and 25mm is left for further processing. These chucks must be coaxial with the A-reference and have a straight step surface relative to it. Next, the two ends of the shaft are milled into flat surfaces with a dimension of 42h6, as shown in Figure 1. These flat surfaces should be symmetric with respect to the A-reference and parallel to each other. For the tooling, two clamping cans are manufactured. As illustrated in Figure 2, the grooves of these cans (42H7) must be symmetrical around the central hole B5, and the end face of the groove should be aligned with the center hole. The cans are mounted on both ends of the shaft, ensuring that their orientation is consistent. The grooves of the cans should fit precisely with the 42H7/h6 flat surfaces of the shaft, allowing for controlled adjustment through the compression screws on the cans. During the lathe operation, the shaft is double-clamped using a four-jaw chuck. The A-reference outer circles are used to measure and adjust the position of the cans. By adjusting the screws on the cans, the amount of misalignment can be fine-tuned. The end face of the can is pressed against the step surface of the shaft, ensuring that the center of the shaft remains parallel to the center of the can. Finally, after the process chucks are cut, the pain axis is completed. This method offers a simple and reliable solution, avoiding the complexity of traditional machining methods, such as working with the central hole of a trampoline. It is particularly suitable for multiple pain axis processing, meeting the demands of modern manufacturing.
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