ASTM_D_6673_-_10.pdf

Designation:D667310Standard Practice forSewn Products Pattern Data InterchangeData Format1This standard is issued under the fixed designation D6673;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This standard is designed to facilitate communicationbetween CAD/CAM systems that represent two-dimensionalflat pattern pieces.This standard also provides conventions forrepresenting related information such as grade rule tables.Thisstandard is not intended to represent the relationships betweenpattern pieces or the correspondence between 2D or 3D sewnproduct pattern piece geometries.1.2 The file format for the pattern data exchange file definedby this standard(Practice D6673)complies with the DrawingInterchange File(DXF)format.Autodesk,Inc.developed theDXF format for transferring data between their AutoCAD(r)product and other software applications.This standard docu-ments the manner in which pattern data should be representedwithin the DXF format.Users of this standard should haveAutodesk,Inc.s documentation on Drawing Interchange Files,found in the AutoCAD Reference Manual,in order to assurecompatibility to all DXF format specifications.The AutoCADVersion 13 DXF specification is to be used.The file format forthe grade rule table exchange file is an ASCII text file.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D6963 Terminology Relating to Sewn Products Automation2.2 ANSI/AAMA Standard:ANSI/AAMA-292A3.Terminology3.1 Definitions of Terms Specific to This Standard:For allterminology related t Sewn Porducts Automation see Termi-nology D6963.3.1.1 alternate grade reference line,nan optional internalline whose orientation is used for the x axis of a grade rule.3.1.1.1 DiscussionThe application of a grade rule will beoriented to the grade reference line unless an alternate gradereference line is specified.(See grade reference line.)3.1.2 base size,nthe digitized or created size of a style.3.1.2.1 DiscussionBase size is a synonym of sample size.(See sample size.)3.1.3 block,na DXF keyword that is used to identify asection of the file that has information about one object.3.1.3.1 Discussiona block keyword should be used toidentify the start of information for a pattern piece and thesection should be ended with an endblk keyword.3.1.4 internal cut outs,nlines,part of a pattern piece,notpart of the piece boundary,which are cut during the cuttingprocess.3.1.5 internal lines,nlines,part of a pattern piece,not apart of the piece boundary,which are not cut.3.1.5.1 DiscussionInternal lines are not cut but may bedrawn during the cutting process.3.1.6 sew lines,ninternal lines that indicate where stitch-ing of pattern pieces is to be done.3.2 Definitions of Terms Specific to This Standard:3.2.1 entities,na DXF keyword that is used to identify thesection of the DXF file describing file identification informa-tion.3.2.1.1 DiscussionStyle system text must be placed in theentities section of the DXF file.3.2.2 system text,ninformation related to either the styleand/or pattern pieces in the DXF file.3.2.3 system text identifier,nkeywords used in DXF file toconstruct syntax and associate values with specific system text.3.2.4 validation vertex,nvertex that is inserted into apolyline in order to guarantee that the resulting polylinerepresents the original curve in the exporting CAD systemswithin a given curve tolerance4.Summary of Practice4.1 Pattern Piece Transfer File FormatThe file formatdefined by this standard complies with the DXF format.ADXFfile is a specially formatted ASCII text file.It consists of anoptional header as well as tables,blocks and entities sections.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.66 on Sewn Product Automation.Current edition approved Jan.1,2010.Published March 2010.Originallyapproved in 2001.Last previous edition approved in 2004 as D667304.DOI:10.1520/D6673-10.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 The tables section allows for user-defined functional layeringof a CAD drawing.Using this provision,this standard orga-nizes the CAD data representing a pattern piece into a numberof layers.This standard currently can incorporate the following patternpiece information:annotation(plotted)text;alternate grade reference line(s);cut line;drill holes;graded nests;grade reference line;grade rule identifiers;grade rule table name;grainline;in