1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards METHOD OF INDICATING CENTER HOLES Do Not Use on New Programs. Being Replaced by Global Design Standards EDS-A-1018 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 (Superceded) EDS-A-1018METHOD OF INDIC
2、ATING CENTER HOLES PAGE: 1/7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology Note: This standard may be applied only for current project drawings generated by CATIA. It is Superceded for all future projects and replaced by Global Design Standards. 1. PURPO
3、SE This standard specifies the simplified representation of center holes in drawings. 2. SCOPE This standard applies to the methods of indicating the center holes in drawings made by GM DAEWOO Auto & Technology Company(hereinafter referred to as the “GMDAT“). 3. DESIGNATION OF CENTER HOLES The cente
4、r hole shall be designated in the order of the angle, name, type and nominal diameter (d). Ex) 90 Center hole Type A 10 Figure 1. Shape of90 Center hole Type A 10 4. INTERPRETATION OF INDICATION The center hole shall be indicated by one of the following three methods depending on the design requirem
5、ents 4.1. Center hole is required on the finished part. 4.2. Center hole can be accepted on the finished part, but is not a fundamental requirement. 4.3. Center hole shall not exist on the finished part. EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE: 2/7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 20
6、08. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology When Standard No and designation of center hole are specified Note 2)Requirement Representation Note 1)Designation Designation (examples) Center hole is required on the finished part. (a) (b) (a) (b) Center hole may remain on the finished part. Cente
7、r hole shall not exist on the finished part. (a) (b) (a) (b) Note1)There shall be applied when standard No. & Indication methods are not specified. Note2)The method (a) shall be applied in principle. However, its difficult to apply the method (a), the method (b) can be applied on drawings. Figure 2.
8、 Methods of indication of center holes on drawings 5. TYPES, SHAPES AND DEMENSIONS OF CENTER HOLES 5.1. Types The types of center holes are shown in Table 1. Table 1. Types of center holes Class Angle of center holes Types Remarks Type 1 60 Type A, B, C, R Type 2 75 Type A, B, C Type 3 90 Type A, B,
9、 C Type A: without protecting chamber. Type B and C: with protecting chamber. Type R: with radius form. Note: The type 2(75 center holes) may not be applied, if possible. Stds No, Designation Stds No, Designation Stds No, Designation EDS-A-1018, 60TYPE A 10 EDS-A-1018, 60TYPE A 10 EDS-A-1018, 60TYPE
10、 A 10 Stds No, Designation EDS-A-1018, 60TYPE A 10 EDS-A-1018, 60TYPE A 10 Stds No, Designation EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE: 3/7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology 5.2. Shapes and dimensions 5.2.1. Type 1: 60 center hole T
11、ype A Type B Type C Unit: mm Reference d (Nominal dia.) D D1 D2(min.) *(max.) b (approx.)1 2 3 t a (0.5) (0.63) (0.8) 1 (1.25) 1.6 2 2.5 3.15 4 (5) 6.3 (8) 10 1.06 1.32 1.7 2.12 2.65 3.35 4.25 5.3 6.7 8.5 10.6 13.2 17 21.2 1.6 2 2.5 3.15 4 5 6.3 8 10 12.5 16 18 22.4 28 1.6 2 2.5 3.15 4 5 6.3 8 10 12
12、.5 16 18 22.4 28 1 1.2 1.5 1.9 2.2 2.8 3.3 4.1 4.9 6.2 7.5 9.2 11.5 14.2 0.2 0.3 0.3 0.4 0.6 0.6 0.8 0.9 1 1.3 1.6 1.8 2 2.2 0.48 0.6 0.78 0.97 1.21 1.52 1.95 2.42 3.07 3.9 4.85 5.98 7.79 9.7 0.64 0.8 1.01 1.27 1.6 1.99 2.54 3.2 4.03 5.05 6.41 7.36 9.35 11.66 0.68 0.9 1.08 1.37 1.81 2.12 2.75 3.32 4
13、.07 5.2 6.45 7.78 9.79 11.9 0.5 0.6 0.7 0.9 1.1 1.4 1.8 2.2 2.8 3.5 4.4 5.5 7 8.7 0.16 0.2 0.23 0.3 0.39 0.47 0.59 0.78 0.96 1.15 1.56 1.38 1.56 1.96 Note*Dimension “” shall not be less than “t” Remarks: Values in ( ) shall not preferably be used. EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE: 4/
14、7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology Type R Unit: mm Reference r 1 t d (Nominal dia.) D Max. Min. * When “r” is max. When “r” is min. When “r” is max. When “r” is min.1 (1.25) 1.6 2 2.5 3.15 4 (5) 6.3 (8) 10 2.12 2.65 3.35 4.25 5.3 6.7 8.5 10.
15、6 13.2 17 21.2 3.154 5 6.3 8 10 12.516 20 25 31.52.5 3.15 4 5 6.3 8 10 12.5 16 20 25 2.6 3.1 4 5 6.2 7.9 9.9 12.315.619.724.62.14 2.67 3.37 4.24 5.33 6.77 8.49 10.52 13.39 16.98 21.18 2.27 2.73 3.45 4.34 5.46 6.92 8.68 10.78 13.73 17.35 21.66 1.9 2.3 2.9 3.7 4.6 5.8 7.3 9.1 11.3 14.5 18.2 1.8 2.2 2.
16、8 3.5 4.4 5.6 7 8.8 11 14 17.5 Note*Dimension “” shall not be less than “t” Remarks: Values in ( ) shall not preferably be used. EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE: 5/7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology 5.2.2. Type 2: 75 center
17、hole Type A Type B Type C Unit: mm Reference d (Nominal dia.) D D1D2(min.) *(max.) b (approx.)123t a 1 1.6 2 2.5 3.15 4 6.3 10 12.5 2.5 4 5 6.3 8 10 16 25 31.5 4 6.3 8 10 12.5 14 22.4 33.5 40 4 6.3 8 10 12.5 14 22.4 35.5 45 1.2 2 2.5 3.2 4 5 8 12.5 16 0.4 0.6 0.8 0.9 1 1.2 1.8 2.2 2.5 0.98 1.56 1.95
18、 2.48 3.16 3.91 6.32 9.77 12.38 1.41 2.23 2.82 3.54 4.46 5.06 8.17 12.23 14.83 1.38 2.16 2.75 3.38 4.16 5.11 8.12 11.97 14.88 0.7 1.1 1.4 1.7 2.1 2.7 4.2 6.6 8.2 0.43 0.67 0.87 1.06 1.3 1.15 1.85 2.46 2.45 Note*Dimension “” shall not be less than “t” EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE:
19、 6/7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology 5.2.3. Type 3: 90 center hole Type A Type B Type C Unit: mm Reference d (Nominal dia.) D D1D2(min.) *(max.)b (approx.)123t a 1 (1.25) 1.6 2 2.5 3.15 4 (5) 6.3 (8) 10 12.5 2.8 3.55 4.5 5.6 7.1 9 11.2 14 1
20、8 22.4 28 31.5 4 5 6.3 8 10 12.5 16 20 22.4 28 35.5 42.5 5 6.3 8 10 12.5 16 18 22.4 25 31.5 40 45 1.1 1.4 1.8 2.2 2.8 3.6 4.5 5.6 7.1 9 11.2 14 0.4 0.5 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.5 0.9 1.15 1.45 1.8 2.3 2.92 3.6 4.5 5.85 7.2 9 9.5 1.25 1.57 1.97 2.49 3.14 3.94 4.99 6.23 7.12 8.82 11.17 12.68
21、1.3 1.65 2.05 2.6 3.3 4.12 5 6.1 7.65 9.2 11.2 12 0.5 0.7 0.8 1 1.3 1.6 2 2.5 3.2 4 5 6.3 0.35 0.42 0.52 0.69 0.84 1.02 1.39 1.73 1.27 1.62 2.17 3.18 Note*Dimension “” shall not be less than “t” Remarks: Values in ( ) shall not preferably be used. EDS-A-1018METHOD OF INDICATING CENTER HOLES PAGE: 7/
22、7 ISSUED DATE: 1996. 04. 10 REVISED DATE: 2008. 05. 31 VERSION: 4 GM DAEWOO Auto & Technology 6. DESIGNATION METHOD The center hole shall be designated in the order of the standard No. angle, type and nominal diameter (d). Ex) EDS-A-1018, 60 TYPE A 10 7. RELATED STANDARDS KS B 0410 Center Holes KS B
23、 0618 Representation of Center Holes JIS B 1011 Centre Holes JIS B 4304 Centre Drills for Centre Holes ISO 6411 Technical Drawings - Simplified Representation of Centre Holes ISO 866 Centre Drills for Centre holes without Protecting Chamfers - Type A ISO 2540 Centre Drills for Centre Holes with Protecting Chamfer - Type B ISO 2541 Centre Drills for Centre Holes with Radius form - Type R
