1. Boring on lathes with workpiece rotating and cutting tool feeding motion mostly belongs to this boring method. The process features are: after machining, the axis line of the hole is consistent with the rotation axis of the workpiece, the roundness of the hole mainly depends on the rotation accuracy of the machine tool spindle, and the axial geometric error of the hole mainly depends on the position accuracy of the tool feed direction relative to the rotation axis of the workpiece. This boring method is suitable for machining holes with coaxiality requirements with the cylindrical surface.
2. When the tool rotates, the workpiece makes feed motion. The boring machine spindle drives the boring tool to rotate, and the worktable drives the workpiece to make feed motion.
3. The tool rotates and makes feeding motion. This boring method is adopted for boring. The overhang length of the boring bar is variable, and the force deformation of the boring bar is also variable. The aperture near the spindle box is large, and the aperture away from the spindle box is small, forming a conical hole. In addition, with the increase of the hanging length of the boring bar, the bending deformation of the main shaft caused by its own weight will also increase, and the axis of the machined hole will produce corresponding bending. This boring method is only suitable for machining shorter holes.
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