1 two-center hole positioning clamping
As a rough benchmark of generally cylindrical surface, machined center hole axis at both ends of the center hole for the positioning accuracy benchmarks; as possible benchmark unified benchmark overlap each other benchmarks, and first installed processing surface.
The center hole is uniform positioning of the workpiece reference and testing benchmarks, its quality is very important, its preparation is relatively complex, and often bearing journal positioning of the car center tapered bore; re-locate to the center hole, fine cars circle; positioned outside the circle, coarse grinding tapered bore; grinding cylindrical center hole location; cylindrical positioning of the bearing journal, grinding , tapered bore, taper the accuracy requirements .
2 clamping cylindrical surface positioning
Positioning of the hollow shaft or short shaft and so can not use the center hole, the cylindrical surface of the available axes positioning, clamping and torque transmission. Special fixtures generally use the universal fixture jaw chuck, four jaw chuck, or a variety of high-precision automatic centering, centering fixture, such as liquid plastic thin-walled diaphragm chuck.
3 with a variety of plug or rod mandrel positioning clamping
Processing of the cylindrical surface of the hollow shaft to install a variety of commonly used with a center hole plug or rod mandrel workpiece. Commonly used plug in the small tapered bore; commonly used with large taper plug lever spindle.
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