Machining reference

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Mechanical parts from several surface relative relationship of the study of the surface of the part, you must determine a benchmark, the benchmark used to determine the position of the other points, lines, surfaces, based on point, line, surface parts. According to the different functions of the benchmark, the benchmark can be divided into two categories of design basis and process benchmarks.angular contact bearings
1. Design basis
The other point, line, surface location of the benchmark used to determine the parts diagram, called the design basis. The sleeve part, the outer and inner bore of the design basis is the axis line of the part, and the end face A is an end face B, C of the design basis, the axis of the inner hole of the cylindrical runout reference.
2. Technology benchmark
The bases used by the parts in the process of machining and assembly, referred to as a reference process. Technological basis for different purposes, divided into assembly benchmark measurement bases and locating datum.special bearing
Mounting reference during assembly of (1) to determine the po sition of the parts in the part or product in the reference, referred to as the mounting reference.
(2) measurement for verifying on the basis of the machining surface the size and position of the reference, referred to as a measurement reference. The axis of the inner hole to test the outer circle runout measurement benchmark;ceramic ball bearing
(3) positioning the basis for working hours workpiece positioning benchmark, known as the positioning reference. Only select unprocessed rough surface as a positioning reference surface (or lines, points), in the first step, the surface of this positioning said coarse reference. Machined surface in each subsequent step can be used as a positioning reference Such positioning surface, said fine reference.