1. SKETCHING IN
Pro/ENGINEER
Part 2

2. Terminology
Constraint: condition defining the geometry of the entity, such as, horizontal, vertical, perpendicular, etc.
Weak constraint: shown in gray. Pro/E may delete this constraint at any time without notification.
Strong constraint: shown in yellow. Pro/E will notify you that you have given conflicting instructions giving you the power to decide which constraint or dimension you wish to keep.
Current constraint: selected constraint, shown in red.

3. Constraints
Weak constraints are added while you sketch.

4. Constraints cont’d
You want all constraints to be strong. If they are strong they will be displayed in yellow.
The smart student will make sure all constraints are yellow.
Delete constraint
Select constraint symbol, press Delete key

5. Constraints cont’d
Constraints made strong, disabled, or toggled between while sketching.
Lock constraint
Toggle between constraints
Hold down the Shift key and right mouse click.
Press the tab key to toggle between constraints
Disable constraint
Sketch
Right mouse click
Result

6. Constraints cont’d
Add constraint after the entity was sketched or make a weak constraint strong.

7. Constraints cont’d
Add constraints after the entity was sketched cont’d.
Before
Selected Vertical:
Selected Horizontal:
Selected center of circles
Selected endpoints
Selected line

8. Constraints cont’d
Perpendicular
Midpoint
Equal
Parallel lines

9. Constraints cont’d
Tangent
Concentric

10. Resolve Sketch
Given:
Lines constrained to be perpendicular and one horizontal
Crashed when tried to also make the lines parallel (2 lines can’t be parallel and perpendicular at the same time.
Undo or Delete the constraint you wish to remove.

11. Practice Constraints – all except symmetric
Try different combinations, such as endpoints, centers of circles and arcs, on the line or edge of circle, etc.
Add conflicting constraints and resolve them

12. Homework
Complete Hands-On 16

13. Dimensions Weak dimensions are in gray
Pro/E may change these dimensions at any time without notification.
Strong dimensions are in yellow
Pro/E will notify you if there is a conflict.
The value of the dimension may change, but you decide whether to display the dimension or replace it with another dimension or constraint.

14. Dimensions cont’d To add a strong dimension Select the Dimension icon
Select entity(ies) – THINK dimensioning rules!
Middle mouse click where dimension is to be placed
Select entity
Place dimension
Place dimension. Notice extension lines overlap object lines. This will cause more work when cleaning up the drawing file.
Select entity
Select endpoints
Place dimension
Better

15. Dimensions cont’d
After all dimensions necessary for manufacturing have been made. Gray constraints must be made strong.
Select endpoints
Place dimension

16. Dimensions cont’d Single click for radius (180° or less)
R will not be displayed in sketch mode, but will in drawing file
Double click for diameter (over 180°)
 will not be displayed in sketch mode, but will in drawing file
Single click. Radius – notice arrowhead.
Double click. Diameter – notice arrowhead.
Click on the circle or arc.

17. Dimensions cont’d To move dimensions To edit dimensions
Select the Select icon, click and drag dimension to new position, release mouse button
To edit dimensions
Select the Select icon, click on dimension and type in new dimension
Modify dimensions
Select the Modify Dimension icon
Select dimensions to be modified.
Edit dimensions, select check mark icon

18. Customize Select Sketch > Options > Sketcher Preferences
Parameter: value in Sketcher, such as, grid spacing, etc.

19. Practice Think dimensioning rules! Add strong dimensions
Move dimensions by dragging them
Edit dimensions (double click) or
Modify dimensions

20. Homework
Complete Hands-On 18

21. Best Way to Start Draw a circle
Edit the dimension to an overall dimension of part
Delete the circle