Step 4.1: Sketch-Loops and Merged-Points

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Step 4.1: Sketch-Loops and Merged-Points


Key Terminology

Sketch-Loop: the derived name for a closed chain of sketch-elements.

Merged-Points: two Points* that are merged into one Point.

* start-Point or end-Point of each sketch-element.


This topic has a video of example sketch-loops in the Part-Editor.

Add sketch-elements, end-to-end, to form a single, continuous loop - see exceptions below.

Add Constraints to the sketch-elements. Constraints are not required, but it is good practice.

We can add a Profile to a sketch-loop. We can also add a Hole to a sketch-loop.


With sketch-loop:

three(3) or more(+3) Points cannot be merged to one Point – this is a Branch Point

sketch-elements cannot cross over each other - this is a Figure-of-Eight

sketch-elements cannot touch each other (other than their merged-Points) - this is Zero-Thickness

Example Sketch-Loops


1: A Circle

The simplest sketch-loop.

Used for a Cam-Follower Roller.

See Also: Cam-Follower


2: Lines

General polygon.


3: Lines and Arcs

General shape.


4: Arcs and Arcs

General free-form shape

Tutorial 4: Add Sketch-Loops