A Sketch-Loop is a sketch that does not have breaks and the Points that join the sketch-elements are merged into one Point.
Generally, do not make a sketch-loop unless you intend to add to it a Profile/Extrusion (Solid) 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, you have two options when you want the ends of two sketch-elements to move to the same position. You can:
- or -
In each case, the two Points show 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:
Condition 1: Coincident Points, 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: 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 different Point become Coincident. This is NOT a Branch-Point.
Condition 3: Figures=of-Eight
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.