By Hans Grabowski, Reiner Anderl, Michael J. Pratt

Reiner Anderl The complex Modelling a part of the CAD*I venture aimed toward the advance of a brand new new release of modelling strategies as a uncomplicated performance of destiny CAD/CAM structures. The technique and ideas for complicated modelling strategies, their availability within the communique interface of a CAD/CAM approach and their impact on inner interfaces within the software program structure of a CAD/CAM method are basic result of complex modelling paintings. those effects shape the root for the advance of a brand new new release of CAD/CAM platforms that are referred to as product modelling structures. CAD/CAM platforms this day more often than not help the geometric description of a technical half or its description as a technical drawing. complicated geometric modelling features take care of parametric layout services embedded into CAD/CAM structures. besides the fact that, improvement suggestions for destiny CAD/CAM structures are directed towards the subsequent: 1. the advance of product modelling structures and a pair of. the advance of built-in structures in accordance with CAD, CAP (Computer Aided Planning), CAM and different CIM (Computer built-in Manu­ facturing) functionalities.

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AO Interpretation of Handwritten Input Message 01 .... 02 50 4. Geometric-Associative Modelling fail 11 r User Input graphic input function set of point t----- recognition process . A12 All ~~ ~~ recognized entity ---.... r PR S_0J> Control System ---. 3-6 AI2 Recognition Process .... 01 .... 02 r 4. Geometric-Associative Modelling ~ tolerance table context analysis rule base nexte. e. e. e. e. nexte. rule: sir. line sir. line I--- rule: sir. e. nexte. 12 51. e. nexte. ~ rule: circle circle A223 nexte.

Both, technical modelling and technical-associative modelling are required to support the preliminary design phase. 3-4. 3. ,1. _. ~_ ••• ~ ~'~ INSERT bar ( dig 11 INTO clip ( dig 21, D1STANCE 10 to (dig 31, F(ITED IN ( dig 4), flUSH WITII ( dig 5), (dig 6) ~~@ ' .. I INSERT gudgeon A:x IALLY PARAUfL WITH DISTANCE x TO shalt 1 AND shalt 2 =9 --- -- - - --- ~'~ ------ '----;--... 3-4a: s~an gudgeon -~' p,'V : 2 '1= I *~"'Z ... ~~ 37rf~ ..!. ,IT'" & I. shan 1 CREATE stamping head OUT OF MFE shaft, POS IT 100 COA:xIAL TO die (dig 1) 1--' - ' - .

This information will hereafter be refered to as position, orientation and dimension data (POD). The POD data is passed to the context analysis system for further processing of the semantic context. The recognition of both technical and command symbols requires a size and position invariant description of the symbol. Picture Description Languages (PDL) INAR-68/ are a technique well suited to this task. These methods involve decomposing an object into geometric primitives, whose relationships and characteristics are then described.

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