Figure 1 shows the two oil plugs on the BJ130 shifting 26 of our factory. The oil plug on the C616 lathe is not well clamped. Due to the taper of the offset lathe tailstock, the center tie and the tip are in poor contact, which causes the oil plug of the car to produce roundness error and cause round jump, and the workpiece taper is unstable. Less than the drawing requirements. To this end, we made a spherical joint for the car oil plug.
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