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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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Motivation l.jpg
Motivation

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


Feature creation procedure l.jpg
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


Construction geometry l.jpg
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


Default construction geometry inventor l.jpg
Default Construction Geometry: Inventor

  • Work planes – mutually perpendicular

    • YZ

    • XZ

    • XY

  • Work Axes

    • X (red)

    • Y (green)

    • Z (blue)

  • Work Point

    • Origin of WCS


Rough sketch l.jpg
Rough Sketch

  • Parametric sketching imitates actual sketching process  rough, approximate


Sketch plane views l.jpg
Sketch Plane Views

View normal to sketch plane

Isometric View


Geometric constraints l.jpg
Geometric Constraints

  • Typical constraints include: vertical, horizontal, collinear, concentric, tangent, etc.

  • Inventor constraints


Display geometric constraints l.jpg
Display Geometric Constraints

  • Software includes option to show constraints


Add delete constraints l.jpg
Add/Delete Constraints

  • User can manually (explicitly) add constraints

concentric

tangent

equal


Parametric dimensions l.jpg
Parametric Dimensions

  • Add parametric dimensions to fully constrain profile

  • Each parametric dimension has two components:

    • Numerical value

    • Name

Fully Constrained Sketch


Parametric dimensions 2 l.jpg
Parametric Dimensions - 2

  • Default parameter names (e.g., d0) can be changed

  • Equations can be used to generate parameter value


Under and over constrained sketches l.jpg
Under and Over-constrained Sketches

Under-constrained

Angle not necessary

Vertical position of hole not specified

Over-constrained



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