This standard specifies the procedures, reduction ratios and overlap requirements for framing drawings. This standard applies to the shooting of special and oversized drawings. GB/T 17739-1999 Microfilming technology Photography of special and oversized drawings GB/T17739-1999 Standard download decompression password: www.bzxz.net
This standard specifies the procedures, reduction ratios and overlap requirements for framing drawings. This standard applies to the shooting of special and oversized drawings.

GB/T17739
This standard is based on the international standard ISO () 724: 19913 Microfilming of technical drawings and other graphic documents Part 1: Microfilming of special and extra-large image supports. This international standard is used according to the requirements of my country. The order of the drawings given in this standard is selected for microfilming. Appendix A of this standard is a reminder.
This standard is proposed and assigned by the International Technical Committee for Microfilming Technology. This standard is drafted by the Second Technical Committee of the China Microfilming Technology Standardization Technical Committee. The drafter of the standard is Xiao Wu Zhuqing
GB/T17739-1999
ISO Foreword
[ISO (International Organization for Standardization) is a worldwide federation of international standardization bodies (ISO member bodies). The work of formulating international standards is usually completed by ISO technical committees. If each member body is interested in a project established by a technical committee, it has the right to participate in the work of the committee. International organizations (official or unofficial) that maintain contact with ISO can also participate in the relevant work: in the standardization of electrotechnical technology, ISO maintains a close cooperative relationship with the International Electrotechnical Commission (IFC). The draft international standard adopted by the technical committee is submitted to the member bodies for voting. It needs to obtain the opinions of at least 75 participating member groups before it can be officially released as an international standard. The international standard ISO3272-4 was drafted by the IS0/TC171 Microfilm and Optical Storage Technical Committee for Document and Image Recording, Storage and Application. ISO 3272 consists of the following parts under the heading "Microfilming of technical drawings and other drawing room documents":— Part 1: Operating procedures; Part 2: Quality standards and control for 35 mm silver halide microfilm images; Part 3: Window cards for 35 mm microfilm; Part 4: Production of special and extra-large size drawings; Part 5: Inspection procedures for microimages on window cards; Part 6: Enlargements, quality standards and controls for 35 mm microfilm 1 Scope National Standard of the People's Republic of China Micrographics Microfilming of special and extra-large size drawings GB/T 17739-1999 3272-4:1994
This standard specifies the requirements for the use of split-frame photographic drawings, reduction ratios and re-printing. This standard applies to special and oversized drawings (see Appendix A for size series).
2 Referenced standards
The following referenced standards are incorporated by reference in this standard and constitute the text of this standard. The versions shown are valid at the time of publication - all standards are valid, and parties using this standard should explore the possibility of using the following standard versions. GB/615.1-:985 Microphotography - Part 1: General terms (m1S05195-1:198) GB/T1502:--194 Specifications for micro-photography techniques and technical documents 3 Definitions
Terms involved in this standard are shown in (iTs
4 Single-frame photography
When photographing a small pattern in a single frame, the pattern should be positioned so that the center of the image is in the center of the frame and the image should be taken at the minimum reduction ratio that can fit the entire image into the frame. 5 Split-frame photography
5. 1 Centering symbol
When a single-frame drawing is to be spliced ​​or a drawing is to be split into long sections, a centering symbol shall be marked at the midpoint of the long side of the split section. The overlap shall not be less than 1 mm (Figure 1). If the original drawing has significant overlap greater than 1 mm in the true part, the reduction ratio shall be selected as per CE/1152:1999 to minimize the original area. 5.2 Positioning of the file on the shooting table Www.bzxZ.net
If the file needs to be rotated during shooting, the resulting file shall be rotated 90° in the counterclockwise direction. 5.3 Reduction ratio 1/3
5.3.1 If the individual image length (mm) of a drawing or multiple drawings is less than 8 mm but the length (mm) is greater than 1210 mm, it shall be preferred to use the form shown in Figure 2 for split shooting.
Approved by the State Administration of Quality and Technical Supervision on April 26, 1999, October 10, 1999 -01 Implementation
Recommendation
GB/T 17739- 1999
Centering symbols and connection parts
Figure 2 Width not less than 8mm and length less than 1210mm 5.3.2 [Sketch or individual pages of multi-page drawings whose width is not less than 890mm but not more than 1210mm and whose length is greater than 12:0mm should preferably be framed in the form shown in Figure 3 5.3.3 Sketch Individual pages of multi-page drawings whose width is not less than 1210mm and whose length is greater than 1219mm should preferably be framed in the form shown in Figure 4 5.3.4 When the individual pages of a single or multi-page drawing are divided and placed on multiple pages (see Figures 2 to 4), the size of each additional page on the grid should not exceed 890mm×1210:m. There should be a 100mm overlap between the adjacent pages. The last page should fill the entire page, and the overlapped part can be enlarged. 5.4 Reduction ratio 1/15 5.4.1 When the width of a drawing or individual pages of a multi-page drawing is not more than 1449mm but the length is greater than 690mm, the form of division and protection shown in the figure should be used first. GR/1177391999 |tt||3 When the width is greater than 8mm and the length is greater than 12.9m, the split shooting of the pattern is preferred.
Title control
Figure 1 When the width is greater than 1210mm and the length is greater than 1210mm, the split shooting of the pattern 5.4.2 When the width of a pattern or individual pages of a multi-page pattern is greater than 440mm but not greater than 600mm and the length is less than 60mm, the split shooting method shown in Figure 3 shall be preferred.
GB/T17739—1999
3 When the width of a pattern or individual pages of a multi-page pattern is greater than 60mm and the length is greater than 600m1, the split shooting method shown in Figure 45.4.3 shall be preferred.
5.4.4 When a drawing or individual pages of multiple drawings are split and photographed on multiple frames (Figure 2-4), the size of each frame should not exceed 440mm×600mm, and there should be at least 10mm1 overlap between adjacent frames. The last frame should fill the frame, and the overlapping part can be enlarged.
5.5 Frame identification
Each frame of a multiple frame series should be marked with consecutive frame numbers, as shown in Figure 2-4. The first frame of a multiple frame series should be marked as I1 and include a title bar, and the next frames should be marked as FF:, etc. The identification symbols used when photographing should be at least 25mm high, and H should be white on a black background and should be located in the original space at the lower part of the frame. Non-standard format
Non-standard format can be processed according to the minimum scale that can accommodate the entire drawing
GB/T17739-1999
Appendix A
(Standard Appendix)
Super large drawing size series
1189×1632
1189X2523
841×1 783
841X2378
591X1261
.E91×1 682
E04X2 102
125×1186
420X1783
420080
297X1 261
257×1 471
257×1 682
297×1 892
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