Step 4.1: Sketch-Loops and Merged-Points

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Step 4.1: Sketch-Loops and Merged-Points

Sketch-Loops.

Key Terminology

Term :

Definition

Sketch-Loop :

the derived name for a closed chain of sketch-elements

Merged-Points :

a Point* from two sketch-elements are merged to one Point

* start-Point or end-Point of the sketch-elements

Objectives:

To review example sketch-loops - see exceptions below.

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

Sketch-Loop Exceptions

A sketch fails to be a sketch-loop if:

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

sketch-elements cross over each other - this is a Figure-of-Eight

sketch-elements touch each other (other than their merged-Points) - this is Zero-Thickness

Example Sketch-Loops

GST-4-101

1: A Circle

The simplest sketch-loop.

There one Circle

Frequently used for a Follower-Roller.

See Also: Follower Shapes


GST-4-102

2: Lines

General polygon. There are five Lines and five Points.

Why:

The Point (end-Point or start-Point) of one Line is merged to the Point (start-Point or end-Point) of the adjacent Line.

If you add five Lines, but do not Merge-Points, there is a total of 10 Points.

GST-4-103

3: Lines and Arcs

General shape.

As above, but there are 3 Lines and 1 Arc.

GST-4-104

4: Arcs

General shape.

As above, but there are three Arcs.

 

Video : Sketch-Loops

Tutorial 4: Add Sketch-Loops