By Hans Grabowski, Reiner Anderl, Michael J. Pratt

Reiner Anderl The complicated Modelling a part of the CAD*I venture geared toward the advance of a brand new iteration of modelling innovations as a uncomplicated performance of destiny CAD/CAM structures. The method and ideas for complicated modelling strategies, their availability within the verbal exchange interface of a CAD/CAM process and their impression on inner interfaces within the software program structure of a CAD/CAM procedure are primary result of complex modelling paintings. those effects shape the foundation for the improvement of a brand new new release of CAD/CAM platforms that are referred to as product modelling platforms. CAD/CAM platforms at the present time almost always help the geometric description of a technical half or its description as a technical drawing. complex geometric modelling services care for parametric layout services embedded into CAD/CAM platforms. even if, improvement suggestions for destiny CAD/CAM platforms are directed towards the next: 1. the advance of product modelling platforms and a pair of. the improvement of built-in platforms in accordance with CAD, CAP (Computer Aided Planning), CAM and different CIM (Computer built-in Manu­ facturing) functionalities.

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These features are used in process planning and NC code generation. This approach restricts the use of form features to very specific pre-defined applications. This library of form features can not be extended. The form features include a simple countersink, chamfered fillet, chamfer, pocket, cutout, boss and groove and are available for the entity classes, "hole", "edge", "recess", "protrusion" and "symmetric". All machining features must be created as implicit form features. Explicit form features can also be created and are defined interactively by selecting 58 5.

Geometric entities or symbols) that are recognized should be stored in the model so as to be available for further analysis. 3-1). The individual modules of the HIS perform the tasks described in the following chapters. ~ L-~ ;' ~ ... ~ ·: C-~ :: ' + J: GeometrIc EntIty TechnIcal Symbol Command Symbol --. , ............... -.. - Arc Spline J... Mechonlc Elektronlc I>

4. 3 Generic Triangle Model with Geometric Constraints /ALD88/ System Specification of the ''Handsketch" Input System (IUS) The "Handsketch" Input System (HIS) was developed as a testbed for new modelling methods based on geometric associativities. The HIS supports the interactive (explicit and implicit) definition and automatic recognition of geometric constraints. Based on the associative modelling approach, modification of a part is well supported. The HIS provides a new communication technique for the description of geometric or symbolic entities in terms of the input of freehand sketches.

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