Point on
Point on constrains a model point to remain on a given geometric element or its extension.
The point part of this constraint may be any visible model point. Line endpoints, circle centers, spline control points, and text reference points may all be used if visible. If necessary, tick the Vertex check box in the Creo Elements/Direct Drafting Show dialog box to make these elements visible.
The extension of an element is its construction-geometry equivalent. For example, the extension of a line segment encompasses any point that would fall on a collinear construction line. The extension of an arc element encompasses any point that would fall on a construction circle that shares the arc's center and radius. All Creo Elements/Direct Drafting geometric elements, including splines, B-splines, and ellipses, are eligible to receive Point on constraints.
The constrained point may slide anywhere along the extension of the element it is attached to, but will always remain in contact with the extension. If other constraints prevent this contact, Solve fails.
To assign Point on constraints:
1. In the Generate Constraints dialog box, click the Assign radio button. Then pull down the Type selection list and select Point on.
2. Click Apply.
3. Click the point to be constrained. You can select any visible model point (Use the Creo Elements/Direct Drafting Show dialog box to display model points if needed). If no point element exists at that location, one will be created.
4. Click the geometry to be attached to the point.
5. Click End or assign the next constraint.
The
Point on icon (see
Constraint Icons) identifies this constraint.