Trouble-shooting Geometry.

You will frequently need to correct a sketch [trouble-shoot] with the Part-Editor.

Below, we list the most frequent problems and the procedures to follow to resolve them.

Where is my Sketch?

Sketch-Loopy

If your sketch 'disappears':

- or -

1.Do CTRL + Z

Example problems:

The Sketch 'Collapses' to a small dot.
The Sketch 'Explodes' to the size of a planet.

Why is my sketch BLACK when it should be BLUE?

Sketch-elements become BLACK when you believe they should be BLUE.

To correct this problem, do one of these actions:

1.Do CTRL + Z

If the sketch-elements remain BLACK, then

2.Delete a constraint or dimension*

-or-

2.Delete a sketch-element

* You cannot see constraints in the graphic-area.

To delete a constraint you must 'find the constraint':

1.Find and click a constraint in the Geometry-Tree
2.Right-click the element to show a contextual-menu
3.Delete the constraint from the contextual-menu

- or -

1.Click a sketch-element in the Graphic-Area
2.Right-click the element to show a contextual-menu
3.Delete the constraint from the Selection-Window

You may need to delete more than one constraint. When sketch-elements becomes BLUE, add a different constraint or the sketch-element again.

Why is my sketch Blue, and I cannot add another constraint to make it Black?

Sometimes, a sketch-element is BLUE and you cannot add more constraints.

You might be able to drag a sketch-element that is BLUE, but when you come to add a new constraint, MechDesigner does not accept it.

In this case, a new constraint may need to remove two degrees-of-freedom, but the sketch has only one degree-of-freedom.


Example:

Coincident-Constraint

If: the end-Point of a Line has a Coincident Constraint with a different Line

Then: it is not possible to also add a Coincident-Constraint with the same Point and a Point along the Line.

To delete the constraint:

1.Click the end-Point of the Circle so that the Point and the Coincident Constraint show in the Selection-Window
2.Delete the Coincident-Constraint using the Selection-Window

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd