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29882464 chapter-6-geometric-modeling-techniques
1.
3/15/2010 1 Geometric Modeling Techniques chapter 6 SALIENT (PRINCIPAL) FEATURES OF SOLID MODELING
2.
3/15/2010 2 Salient Features of Solid Modeling • Feature based design • Modeling tools •
Characteristics of solid modeling packages Feature based design Sk t h b dSketch based
3.
3/15/2010 3 Feature based design Pick and place
4.
3/15/2010 4 Modeling tools • Sketching (2D) • Creating part •
Assembly • Documenting design Characteristics of SM package • Parametric design • Relations and relationships • Behaviour modeling – Smart models – Engineering objective based design O t ibl i t– Open extensible environment
5.
3/15/2010 5 Relationship Relationship
6.
3/15/2010 6 FEATURES OF DRAFTING PACKAGES Features of Drafting Packages • Drawing utilities •
Dimensioninga g u es • Entity drawing • Edit commands • Standard parts • Display e s o g • Plotting • Configuration • Customization • Drawing Interchange • Cross hatching
7.
3/15/2010 7 DRAWING UTILITIES Drawing Utilities • Screen size S li •
Specifying points Li t t t f t• Scaling • Grid • Snap • Units • Line type, text fonts, and shapes • Layers • Saving a drawing • File utilities
8.
3/15/2010 8 Layer ENTITIES
9.
3/15/2010 9 Entities Tugas: baca sub‐bab di bawah ini • Edit commands • Block and symbols •
Display • Cross hatching and pattern filling
10.
3/15/2010 10 DIMENSIONING
11.
3/15/2010 11 3D DRAWINGS 3D Drawings • Extrusion (linear sweep) • Revolution •
Using UCS (user coordinate system)
12.
3/15/2010 12
13.
3/15/2010 13 Tugas: belajar sub‐bab di bawah ini • Plotting a drawing • Configuring the drafting software •
Customization
14.
3/15/2010 14 DRAWING INTERCHANGE FILE
15.
3/15/2010 15 DRAWING OFFICE MANAGEMENT Drawing office management • Creation of parts list Bill f
t i l (BOM) • Project costing P d t i ti• Bill of material (BOM) • Searching for similar design • Design changes • Replacing faulty • Product variations • Web enabled softwares • Integrated drafting, design, and documentations components
16.
3/15/2010 16 SURFACE MODELING
17.
3/15/2010 17
18.
3/15/2010 18 CURVE AND SURFACE REPRESENTATIONS Generic Form 0f
0,, zyxf
19.
3/15/2010 19 Parametric form Properties of parametric reps
20.
3/15/2010 20 CURVE & SURFACE DESIGN Design of curve shapes • Mathematical representation of shape • Minimum computation •
Ability to generate a CNC program
21.
3/15/2010 21 PROBLEMS WITH SPLINE INTERPOLATION Criteria of curve modeling •
Axis independence • Global and local control • Smoothness of curves • Versatility • Continuity between adjoining segments of curves
22.
3/15/2010 22 CUBIC SPLINES – POLYNOMIAL BASIS Hitung persamaan curva 3D: 1 X(0)
i t l i l1.X(0) – interpolasi awal 2.X(1) – interpolasi akhir 3.X’(0) – singgung awal 4.X’(1) – singgung akhir
23.
3/15/2010 23 LIHAT HALAMAN 156 page 159 BEZIER CURVES – BERNSTEIN BASIS
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