A Sketch-Loop is an important concept in MechDesigner.
Generally, do not make a sketch-loop unless you intend to add to the sketch-loop a Profile or a Motion-Path FB.
Each Line or Arc you add to the graphic-area has a Point at each end.
In the Part-Editor, to join the Points, you can:
- or -
In both cases, the Points appear in the graphic-area as one Point. However:
Use Merge-Points when you want to make an open or closed sketch-path.
You can use a sketch path for a Motion-Path FB
You can use a closed sketch-path [sketch-loop] for a Profile element.
There are two ways to merge two Points into one Point:
Use the Hover Technique as you add the sketch-elements.
Use the Merge-Points tool after you add the sketch-elements,
You can use Merge-Points, to 'repair' a sketch-loop when the Points coincident but not merged.
Condition 1: Point are Coincident and not Merged
Points are not recognized as part of a sketch-loop when they are coincident.
You must merge the Points into one Point where each Line and Arc join.
Condition 2: No Branches
You CANNOT merge three Points into one Point - for example, the ends of three Lines or Arcs - you have a 'Branch-Point'. A Branch-Point is not O.K.
You CAN merge two Points, then make a Point at the end of a Line or Arc to be Coincident with the merged Point. This is NOT a Branch-Point.
Condition 3: No Figures of Eight or sketch-elements that touch
A sketch-element can not cross another sketch-element in the same sketch-loop.
A sketch-element cannot osculate, or touch, another sketch-element in the same sketch-loop.