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.
If your sketch 'disappears':
- or -
Sketch-elements become BLACK when you believe they should be BLUE.
To correct this problem, do one of these actions:
If the sketch-elements remain BLACK, then
* You cannot see constraints in the graphic-area.
To delete a constraint you must 'find the constraint':
- or -
You may need to delete more than one constraint. When sketch-elements becomes BLUE, add a different constraint or the sketch-element again.
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.
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: