How linear ball bearing slider affect the spindle radial runout?

Linear ball bearing slides are bearings that move linearly on a straight track and belong to sliding bearings.
Linear ball bearing slides are used to determine the relative movement position of the rotating shaft and other parts, and are used as supporting or guiding parts. The main function of linear ball bearing slides is to support the mechanical sliding body to reduce the friction coefficient of the mechanical load during the transmission of the equipment.

The influence of linear ball bearing slider on the radial runout of the spindle
When linear ball bearing slider are used as support, the main shaft rotates with a journal in the bearing hole. For lathe guide rails, during the machining process, the force direction of the main shaft is determined, and the main journal is pressed to a fixed position on the surface of the bearing hole by the cutting force. At this time, different parts of the main journal are in contact with the fixed part of the bearing hole, so the roundness error of the journal will cause pure radial runout of the spindle rotation, while the shape error of the linear ball bearing slider has no effect on the spindle rotation accuracy is small.

For the boring machine guide, the cutting force acting on the spindle rotates with the rotation of the boring tool, and the fixed part of the journal is in contact with different parts of the surface of the linear ball bearing slider. Therefore, the roundness error of the linear ball bearing slider will cause pure radial runout of the spindle of the boring machine, and the shape error of the main journal of the boring machine affects the rotation accuracy of the spindle, which does not sound too loud.

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