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# Chapter 7 Advanced Sketching and Constraining Techniques.

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Chapter 7 Advanced Sketching and Constraining Techniques

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 Chapter 7 - Objectives

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

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

2D Splines –Create complex shapes –Free flowing shapes –Points –Edited and Controlled –Spline options

2D Splines Spline options –Bowtie Handle Curvature Flat

2D Splines Spline options –Fit Method Smooth Sweet AutoCAD

2D Splines Spline options –Insert Point –Close Spline –Display Curvature

2D Splines Spline options –Spline Tension –Constrain and Dimension a Spline

Exercise 7-1 Complex Sketching

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

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

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

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

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

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

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

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

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

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

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

Linked Parameters –Multiple values & same parameters –Spreadsheet Microsoft Excel

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

Exercise 7-3 Auto Dimension, Relationships and Parameters

Summary ToDo This Create construction geometryChange the line style to Construction in the Style area on the standard toolbar. Create splinesClick the Spline tool on the 2D Sketch Panel Bar. Pattern a sketch objectClick either the Rectangular Pattern tool or Circular Pattern tool on the 2D Sketch Panel Bar. Share a sketchRight-click on the sketch name in the Browser and select Share Sketch from the menu. Mirror a sketchClick the Mirror tool on the 2D Sketch Panel Bar. Temporarily slice away a portion of the model that obscures the plane After making a sketch active, right-click and select Slice Graphics from the menu. Sketch on a plane of another part Click the 2D Sketch tool on the standard toolbar and click on any planar face or plane of another part. Create parametersClick the Parameters tool on the Sketch, Part Features, or the Assembly Panel Bars.

Applying Your Skills Skill Exercise 7-1

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