MAE 455 Computer-Aided Design and DraftingCreating Points and Curves!Point and curve sketching and operations.MAE 455 Computer-Aided Design and Drafting22D Sketch Creation Steps1) On “Sketch” tab press (or select any curve drawing tool; or double-click on an existing sketch in the graphics window; or click on sketch in Feature Manager and select ).2) Select sketch plane (if starting new sketch).3) Use sketching tools to create curves.4) Press when finished.5) Verify that the sketch exists in the Feature Manager. Give the sketch a meaningful name.MAE 455 Computer-Aided Design and Drafting32D Sketch Points and Curves• Sketch point:• Straight line segment:• Circle/arc: or • Ellipse/conic: • Freeform (spline): • Text: How are rectangles ( ), fillets/chamfers ( ), polygons ( ), offset ( ), pattern curves ( ), mirror curves ( ), and slots ( ) tracked by the CAD system?MAE 455 Computer-Aided Design and Drafting4Trimming/Extending 2D Curves• To trim the end(s) of a curve to begin/end at the intersection with another curve use trim:• To extend the end of a curve to meet another curve, use extend:• But if you can, it is better to use constraint relationships.MAE 455 Computer-Aided Design and DraftingBlocks• Use blocks to:– keep a set of curves together in the same relative positions– easily make copies of a group of curves• Turn on the block toolbar to access tools for creating and modifying blocks. 5MAE 455 Computer-Aided Design and Drafting3D Curves• Lines and other curves can be drawn in 3D space by turning on “3D Sketching”:– Press or– Press to sketch on selected plane.• 3D curves can be drawn by:– Clicking points in space on given plane, or– Clicking on existing geometry anywhere in space.• 3D curves are grouped as a “3D Sketch” in the Feature Manager.6MAE 455 Computer-Aided Design and Drafting3D Curves• Other specialized kinds of 3D curves can be created. E.g.:– 3D Spline curve– Helix curve• 3D curves can also be created using operations such as:– Intersection– Projection,
View Full Document