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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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Presentation Transcript
motivation
Motivation

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

feature creation procedure
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
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
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
Rough Sketch
  • Parametric sketching imitates actual sketching process  rough, approximate
sketch plane views
Sketch Plane Views

View normal to sketch plane

Isometric View

geometric constraints
Geometric Constraints
  • Typical constraints include: vertical, horizontal, collinear, concentric, tangent, etc.
  • Inventor constraints
display geometric constraints
Display Geometric Constraints
  • Software includes option to show constraints
add delete constraints
Add/Delete Constraints
  • User can manually (explicitly) add constraints

concentric

tangent

equal

parametric dimensions
Parametric Dimensions
  • Add parametric dimensions to fully constrain profile
  • Each parametric dimension has two components:
    • Numerical value
    • Name

Fully Constrained Sketch

parametric dimensions 2
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
Under and Over-constrained Sketches

Under-constrained

Angle not necessary

Vertical position of hole not specified

Over-constrained

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