The data compose such as 5-1999. The classifies central aperture formal mark give typical examples of central aperture tags demonstrative R(arc) according to GB145 choice center gets GB/T 4459.
7mmA(does not carry protective drill) according to GB145 choice center gets GB/T 4459.
5mmB(belt protects awl) according to GB145 choice center gets GB/T 4459.
5mmD1=8mm C(takes whorl) according to GB145 choice center gets GB/T 4459.
3D=M10 L=30mm D2=16.
Whether does the symbol of 3mm center aperture retain the requirement of central aperture on finishing spare parts for expression, can use the symbol that sets in next watches. Requirement symbol tags explanation of give typical examples to ask to withhold central aperture to ask to make D=2 of B center aperture on finishing spare parts.
5It is OK on finishing spare parts that D1=8 asks to withhold on finishing spare parts reservation center aperture uses A center opening D=4 D1=8.
5 whether to withhold on finishing spare parts can not allow to withhold central aperture to use D=1 of A center aperture on finishing spare parts.
The 35 measure that do not allow aperture number on finishing spare parts reach his if the scale relation of departmental cent pursues 1. D= 1 H 10H1=1.
The graph line coarseness of the outline of area B- spare parts that A- of 4hh= font height tags central aperture symbol pursues the 1 tags regulation of corresponding to having standard center aperture on the design, in the design but not scale is detailed structure, need outpour only its code name, if what the watch shows. If the hole of two upright centers of same axis is same, can carrying line out firstly only, but should outpour its amount (graph 2) . Graph 2 when be like the standard code name that wants demonstrate center opening, can tag the lower part in central pass date (graph 3, 4) . Graph 3 graphs the surface roughness of surface of job of 4 centers aperture should be on derivative line line out (graph 5, graph 6) , the upper limit value of exterior surface roughness is 1.
25µm. It is with the axes of central aperture fiducial when, fiducial generation (accord with) date can press a plan 5, graph the method of 6 is tagged. Graph 5 graphs 6 CNC Milling