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Parametric Sketching

Parametric Sketching. Motivation. Solid primitives not typically supported in parametric modelers  must create a 2D profile, then sweep. Feature Creation Procedure. Choose sketch plane, either a: Default work plane Planar face of existing feature Work plane Rough sketch

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Parametric Sketching

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  1. Parametric Sketching

  2. Motivation Solid primitives not typically supported in parametric modelers  must create a 2D profile, then sweep

  3. Feature Creation Procedure • Choose sketch plane, either a: • Default work plane • Planar face of existing feature • Work plane • Rough sketch • Some geometric constraints applied • Add/delete geometric constraints • Parametric dimensioning • Feature creation • Repeat 1 - 5

  4. Construction Geometry • Geometry created as part of the parametric modeling process that does not represent actual part geometry. Includes: • Work planes • Work axes • Work points • Construction geometry appears in feature tree

  5. Default Construction Geometry: Inventor • Work planes – mutually perpendicular • YZ • XZ • XY • Work Axes • X (red) • Y (green) • Z (blue) • Work Point • Origin of WCS

  6. Rough Sketch • Parametric sketching imitates actual sketching process  rough, approximate

  7. Sketch Plane Views View normal to sketch plane Isometric View

  8. Geometric Constraints • Typical constraints include: vertical, horizontal, collinear, concentric, tangent, etc. • Inventor constraints

  9. Display Geometric Constraints • Software includes option to show constraints

  10. Add/Delete Constraints • User can manually (explicitly) add constraints concentric tangent equal

  11. Parametric Dimensions • Add parametric dimensions to fully constrain profile • Each parametric dimension has two components: • Numerical value • Name Fully Constrained Sketch

  12. Parametric Dimensions - 2 • Default parameter names (e.g., d0) can be changed • Equations can be used to generate parameter value

  13. Under and Over-constrained Sketches Under-constrained Angle not necessary Vertical position of hole not specified Over-constrained

  14. Parametric Sketching

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