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PSU METBD 110 - Application of Geometric Sketching Constraints

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METBD 110 Hands-On 16Application of Geometric Sketching ConstraintsWhy:Learning Objectives:Performance Criteria:Resources in addition to Previous Reading Assignments, Hands-On Web Sites, Other Students, Class Notes, and Instructor:Plan:Critical Thinking Questions:Why:A primary and essential goal of parametric modeling is the appropriate use of constraints and parametric relations to capture design intent. Constraints fall into two categories: geometric and dimensional. For part modeling in Pro/E, constraints are applied to 2-D sketches. Geometric constraints are applied to geometric entities and are used just as the name implies (to constrain or restrict geometry). Examples of geometric constraints include horizontal, parallel, perpendicular, and tangent, etc. This exercise focuses on the use ofgeometric constraints. Learning Objectives:- Start new Pro/E sketch files. - Understand how to apply and delete geometric constraints.- Understand how the use of geometric constraints impacts the geometry/model.- Understand the difference between a weak constraint (gray) and a strong constraint (yellow).Performance Criteria:- Constraints and geometry are added properly.- No additional constraints are used.- All constraints are strong constraints.- Understand impact of constraint by dragging geometry. Resources in addition to Previous Reading Assignments, Hands-On Web Sites, Other Students, Class Notes, and Instructor:8/19/02 1 of 5METBD 110 Hands-On 16Application of Geometric Sketching Constraints- Creating Sketches - Pro/E reading assignments- Tutors.- SI (Supplemental Instructor)..8/19/02 2 of 5ABCDEFPlan:1. Access the Pro_E courseware datadisk.2. Using Windows Explorer copy the sketch files Constraints-1.sec and Constraints-2.sec from the PRO_E folder on ‘PSBDFILESRVR’ (V:)\METBD_110\pro-e to your P drive.3. Start Pro/ENGINEER.4. Set your working directory to your P-drive. Constraints-1 and Constraints-2: 5. Open the sketch file named ‘Constraints-1’. 6. Turn off dimensions to avoid confusion! You may want to shut-off auto-constraints (Sketch – Options – SketcherPreferences Constraints tab – uncheck all constraints) and add each constraint manually.7. Rename the file to ‘yourlastname-constraints-x’ (with X being the constraint problem number) i.e., Smith-constraints-1. (File – Rename – type in the new name – OK)8. Draw geometry and add constraints in column A, to match column B. a. Remember we are NOT using the system as it was designed!! Do not worry about size and placement of geometry – just the proper constraints.b. Delete excess constraints (gray or yellow). Column A must match column B yellow constraints. c. Make sure the required constraints are strong (yellow). 9. Save the file. (File – Save – Ok. You cannot rename a file when using the save command.) 10. Close the file (File – Close Window – Yes) 11. Repeat steps 5 thru 10 for Constraints-2.Constraints-3:12. Start a new sketch file. (File – New – Sketch – yourlastname-constraints-3 I.e, Smith-constraints-3)13. Create the following sketch applying constraints stated below. Today size doesn’t matter, but appropriate constraints do. a. Design Intent:- All lines will be vertical or horizontal.- Lines A and F are to be equal in length.- Lines B, C, D and E are to be equal in length, but shorter than lines A and F.- The holes are to be aligned horizontally and equal in size.- The center of the right hole is to be aligned vertically with line D.14. Save file (File – Save – Ok).15. Close sketch window (File – Close Window – Yes).Constraints-4: 16. Start a new sketch file. (File – New – Sketch – yourlastname-constraints-4 I.e, Smith-constraints-4)17. Turn off dimensions.18. Create the following sketch with constraints:8/19/02 3 of 5Note two centerlines19. Mirror about horizontal centerline.a. Select geometry first, select mirror icon, then select only the horizontal centerline.20. Mirror about vertical centerline:21. Save file.22. Try dragging geometry. What effect do the constraints have?23. Print, with label, and turn in to instructor. (This does NOT mean to add text while in sketcher. Refer to the Sketch File Manipulation web page you printed out for your last class. It will tell you how to addthe label when printing.)24. After instructor has reviewed your work, try to drag geometry for each constraint example to see what impact constraint has on that geometry.8/19/02 4 of 5Note two centerlinesSelect the center point of the arc and drag it. Watch what happens.Critical Thinking Questions: 1. How does each constraint in the above exercise restrict geometry?2. How are geometric constraints used to capture design intent? Think of a simple object or design and give examples of how constraints might be used to capture design intent.3. Draw the symbol for each Pro/E constraint and sketch an example illustrating how that constraint is used.8/19/02 5 of


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