Does Ball Screw Assembly Affect Accuracy?

The ball screw is a precise mechanical transmission element, which has some requirements for accuracy, and there are many reasons for its absolute accuracy. So will the ball screw be affected by the operation during assembly? The answer is yes. In the transformation of the vertical CNC lathe, the ball screw will vibrate in the horizontal direction when it is used, and the repeated positioning accuracy is not enough. The screw can be disassembled and checked for wear, groove marks, peeling, etc. In addition to quality, lubrication and protection factors, the reason for this is also important to assembly accuracy.

If the axis line of the bearing seat holes supporting the two ends of the screw rod is not parallel to the guide rail surface, the actual thread line of the screw rod is inclined relative to the guide rail after the screw rod is assembled, and the nut is fixed on the tool holder, and the tool holder follows the guide rail. The guide rail surface moves in a straight line. During the movement of the nut, the axis of the screw rod tends to be close to the ideal position, so that the screw rod produces elastic bending deformation, and the screw rod has an overturning moment on both ends of the nut. The balls in the raceway have no cage. When the balls run to both ends of the nut, they are squeezed against each other under the action of the overturning moment, and the balls are blocked from running, resulting in increased wear, and in severe cases, groove marks will appear, which will cause vibration and lead to the lead of the screw. error. Therefore, when we use the ball screw to assemble the screw, we must pay great attention to the positional accuracy of the relevant parts. After the assembly procedure is completed, manually rotate the ball screw to make it rotate lightly and smoothly.