Unit 5 Geometric Constraints Procedure 1. Open the file called Geometric Constraints. Read the instructions above each image in the file and use the Geometric Constraint tools to complete each of the 12 exercises. Your completed sheet should look similar to the sheet pictured. 2. Make the geometric constraints visible by choosing the Show Constraints tool in the Constrain panel under the Sketch tab. 3. Add your name to the bottom right corner of the sheet. You may use the Text tool in the Draw panel under the Sketch tab to add text to a sketch. 4. Save the file as a different name, take a screen shot of it and paste it in the space below and submit it along with this activity to your instructor for evaluation. Conclusion Questions 1. What is a geometric constraint? A geometric constraint is a constraint that constrains the geometry of a shape, ex. Tangent, parallel or perpendicular. 2. What are the different types of geometric constraints that are applied to sketches, and what are their functions? Perpendicular- a constraint that causes selected line geometry to lie at right angles to each other. Parallel- causes selected linear geometry to lie parallel to each other Coincident- constrains points to other geometries in 2D and 3D sketches Collinear- causes two or more line segments to lie on the same line Concentric- causes two arcs/circles to have the same center point Fix- fixes points and curves in position relative to the sketch coordinate system Horizontal- makes a line parallel to the x axis of the sketch coordinate system Vertical- makes a line lie parallel to the y axis of the sketch coordinate system Tangent- constrains circles/arcs to be tangent to other circles/arcs Smooth- applies a continuous curvature to a spline Symmetric- makes things symmetric over a selected line Equal- makes 2 circles/arcs have the same radius, makes two shapes equal in size 3. Define “tangent”. When a straight line touches a circle or arc but does not pass through it a. Sketch a line tangent to two circles. b. 4. Sketch three circles such that all circles are tangent to the other two. 5. How is a geometric constraint different from a numeric constraint? A geometric constraint is different from a numeric constraint because geometric constraints define the location of a geometric shape relative to another, while numeric constraints are simply just numeric values.
