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- 1. Curves from Beginning to End Mark Biasotti SolidWorks Corporation Product Definition – New Concepts January 22 nd 2008
- 2. Outline <ul><li>2D sketch vs. 3D sketch </li></ul><ul><li>Current curve types in SW </li></ul><ul><li>The basics of the 2D sketch spline </li></ul><ul><li>The basics of the 3D sketch spline </li></ul><ul><li>Using Relationships with 2D sketch spline </li></ul><ul><li>Using Relationships with 3D sketch spline </li></ul><ul><li>Using 2D and 3D splines in Surface construction </li></ul>
- 3. Splines: Can live with them, can live without them! What are they good for and why do we use them?
- 4. Splines: Can live with them, can live without them My Goal: By the end of this presentation I hope to transform your feelings about splines from this… To This
- 5. Why use Splines? When shape can not be described by line, arc, ellipse etc. (or it takes many of them in series to accomplish) Series of arcs Single Spline
- 6. Why use Splines? Single Spline results in smoother overall edge verses series of arcs. Series of arcs Single Spline C1 C2
- 7. Why are splines so important to consumer product design? <ul><li>Many products, although they look prismatic, are not. </li></ul>
- 8. Explanation of C0 thru C3 <ul><li>Surface matching conditions explained </li></ul>C0 Condition – Surface boundaries share Common edge but no tangency C1 Condition – Surface boundaries share Common edge with tangency but rate of curvature does not match at boundary C2 Condition – Surface boundaries share Common edge with curvature matching C3 Condition – Surface boundaries share Common edge with curvature matching to greater degree than C2
- 9. 2D verses 3D Sketch 4 degrees of freedom vs. Six Degrees of freedom
- 10. Types of Curves in SolidWorks <ul><ul><li>2D Sketch Spline </li></ul></ul><ul><ul><li>Projected Curves </li></ul></ul><ul><ul><li>2 sketch Projection – 3D Curve via 2ea. 2D sketches </li></ul></ul><ul><ul><li>3D sketch spline </li></ul></ul><ul><ul><li>Spline on Surface (SOS) </li></ul></ul><ul><ul><li>Curve thru XYZ/reference points </li></ul></ul><ul><ul><li>Face Curves </li></ul></ul><ul><ul><li>Convert and offset entities – composite curves </li></ul></ul><ul><ul><li>Fit Spline: using analytical (arcs, lines, splines etc.) and fitting a spline over it </li></ul></ul><ul><ul><li>Curve by intersection (of two surfaces) </li></ul></ul><ul><ul><li>Helix and Parabola </li></ul></ul>
- 11. The 2D spline Curvature Comb (Show Curvature) point of inflection Control Polygon Handle Spline point handle widgets Shadow Spline position
- 12. The 2D spline Spline point Asymmetrical Tangent Magnitude Vector Angle Widget Combined Asymmetrical Vector + Tangent <ul><li>Spline Tip – Hold down <Alt> key when dragging Vector/Tangency Widget to get symmetrical control. </li></ul>
- 13. The 2D spline PropertyManager checked <ul><li>Spline Tip – When using Control Polygon, use Relax Spline when continuing to edit spline via spline points and make sure Tangent driving is off. </li></ul>un-checked C3 Continuity possible* when 2 point spline with equal curvature Current spline point’s values Reset current or all spline handles Relax (Re-parameterize – i.e. smooth) the spline Allows for Spline end points to be dragged while maintaining previous tangency keeps all points porportional to each other (will illustrate later)
- 14. Lets review with a SolidWorks example
- 15. Creating and re-shaping splines
- 16. Asymmetrical control of spline handles <ul><li>Example of using Spline control widgets for tracing complex shape objects. </li></ul>Asymmetrical Tangent Magnitude Widget Vector Angle Widget Vector + Tangent Magnitude To pull asymmetrically
- 17. Degree raising <ul><li>You can make a C3 spline with the following requirements: </li></ul><ul><ul><li>2 point spline only </li></ul></ul><ul><ul><li>C= relationships on both ends </li></ul></ul>Standard Degree Raising
- 18. Applying a Face Tangency Constraint Using Face Tangency Constraint & Equal Curvature *Play Video to show
- 19. Using the Proportional Option
- 20. 3D curve by 2ea. – 2D sketch spline curves
- 21. Curve thru X,Y,Z Points
- 22. Curve thru Reference Points
- 23. Face Curves
- 24. Curve by intersection of surfaces (or planes)
- 25. Fit Spline Function Higher Tolerance <ul><li>SolidWorks Tip: Which is more smooth – the lower or higher tolerance? </li></ul>
- 26. Convert, Offset & Composite Curves <ul><li>In the 2D sketch – “Convert Entities” and “Offset Entities” </li></ul><ul><ul><li>Allows user to copy or offset external (outside the sketch) model edges </li></ul></ul><ul><li>In the 3D sketch – “Convert Entities” </li></ul><ul><ul><li>Allows user to copy external model edges </li></ul></ul><ul><li>Outside the sketcher – “Composite Curve” </li></ul><ul><ul><li>Allows the user to gather model edges into one single curve entity </li></ul></ul>
- 27. Helix Curves <ul><li>Built from single 2D sketch circle. Can control: </li></ul><ul><ul><ul><li>Pitch </li></ul></ul></ul><ul><ul><ul><li>Variable Pitch </li></ul></ul></ul><ul><ul><ul><li>No. of Revolutions </li></ul></ul></ul><ul><ul><ul><li>Can make tapered </li></ul></ul></ul>
- 28. Application of 2D Sketch Spline “Bridge Spline”
- 29. Getting around problem with constraining to projected curve Initial over constraint Play Video to show
- 30. 3D Sketches – how do they work?
- 31. Editing 3D sketch splines in 3D space
- 32. Getting around in 3D space <ul><li>When creating multiple point 3D sketch splines two helps to controlling them are: </li></ul><ul><ul><li>The Sketch Triad </li></ul></ul><ul><ul><li>Multiple windows </li></ul></ul>
- 33. Using curves in Surface features <ul><li>Curves in surfacing, can affect and correct flow of surface </li></ul>3 Curves in 2 nd direction 4 Curves in 2 nd direction 2 2 3 4 3 1 1 Play Video to show*
- 34. Using reference surfaces with 3D Sketch
- 35. Using curves in Surface features <ul><li>Reference surface example </li></ul>Boundary Surface Fill Surface Reference Surface Reference Surface
- 36. Using curves in Surface features <ul><li>Fill Surface with Curve Example </li></ul>
- 37. 3D sketch splines and surfaces
- 38. Andy and I will now take your questions

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