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Advanced Sketching Techniques and Constraints in Chapter 7

Learn construction geometry, ellipses, 2D splines, complex shapes, pattern sketches, mirror tool, slicing graphics, dimensional relationships, and parameters. Enhance your skills in AutoCAD with practical exercises.

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Advanced Sketching Techniques and Constraints in Chapter 7

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  1. Chapter 7 Advanced Sketching and Constraining Techniques

  2. Chapter 7 - Objectives • After completing this chapter, you will be able to • Use construction geometry to help constrain sketches • Create and constrain an ellipse • Create a 2D spline • Create a pattern of sketch geometry • Share a sketch • Utilize both the symmetry constraint and mirror tool • Slice the graphics window • Sketch on another parts face • Change the display of dimensions • Create relationships between dimensions • Create parameters • Create a part that is driven from a Microsoft Excel spreadsheet

  3. Construction Geometry • Construction Geometry • Reduce the number of constraints and dimensions that are required to fully constrain a sketch • Example.. • circle inside a hexagon can drive the size of the hexagon • Can be constrained and dimensioned • Not seen in the part • Editing • Line style • Color of the image

  4. Ellipses • Ellipses • Can be trimmed, extended, and dimensioned • Offset • Concentric ellipse • Spline profile • Major or minor axis

  5. 2D Splines • 2D Splines • Create complex shapes • Free flowing shapes • Points • Edited and Controlled • Spline options

  6. 2D Splines • Spline options • Bowtie • Handle • Curvature • Flat

  7. 2D Splines • Spline options • Fit Method • Smooth • Sweet • AutoCAD

  8. 2D Splines • Spline options • Insert Point • Close Spline • Display Curvature

  9. 2D Splines • Spline options • Spline Tension • Constrain and Dimension a Spline

  10. Exercise 7-1 • Complex Sketching

  11. Pattern Sketches • Pattern Sketches • Instead of creating multiple sketches • Rectangular or Polar • Occurrences or Elements • Rectangular & Circular Pattern dialog box • Suppress • Associative • Fitted • Occurrences or Elements

  12. Shared Sketches • Shared Sketches • Copy of the original sketch • Same sketch geometry, dimensions & face • Same name • Update • On limit

  13. Mirror Sketches • Mirror Sketches • Create a symmetrical part • Symmetry constraint • Reduce the number of constraints and dimensions • Changes - updates • Automatically • Manually • same object type • lie on opposite sides of a line

  14. Slice Graphics • Slice Graphics • Obscuring the view • Plane that is difficult to see • Temporarily slice away • Working in an assembly

  15. Sketch on another Part’s Face • Sketch on another Part’s Face • Sketch • Can be placed on a face or plane of another part • Not limited to first sketch • Associated • Adaptive

  16. Exercise 7-2 • Projecting Edges and Sketching On Another Part’s Face

  17. Dimension Display • Dimensional Relationships • Set up relationships between dimensions • Dimension Display • Automatically tagged - label • “d” and a number (d0, d27) • Five options (Display as..) • Value, Name, Expression • Tolerance • Precise Value • Change dimension display style

  18. Dimension Relationships • Dimension Relationships • Setting relationship between creating and existing dimensions • Edit Dimension dialog box • Dimensions label (d#) • Prefix fx = value based on parameter or other dimension

  19. Dimension Equations • Dimension Equations • Can be used whenever a value is required • Example.. • (d9/4)*2, or 50 mm + 19 mm • prefixes, precedence, operators, functions, syntax, and units • Help system • Invalid expression • Red

  20. Parameters • Parameters • User-defined name assigned a numeric value, either explicitly or through equations • Multiple parameters • depth = length – width • Anywhere a value is required • Three types • model parameters • user parameters • linked parameters

  21. Parameters • Parameters • Parameters dialog box • Model Parameters • automatically • Reference • driven dimension • User Parameters • manually defined • Column names • Parameter Name • Units • Equation • Nominal Value • Tol • Model Value • Export Parameters Column • Comment

  22. Linked Parameters • Linked Parameters • Multiple values & same parameters • Spreadsheet • Microsoft Excel

  23. Linked Parameters • Linked Parameters • Spreadsheet Embedded • no link – no updates • Spreadsheet Linked • will update • more than one can be linked • Guidelines • Edit

  24. Exercise 7-3 • Auto Dimension, Relationships and Parameters

  25. Summary

  26. Applying Your Skills • Skill Exercise 7-1

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