﻿ Getting Started Tutorials - MechDesigner > Tutorial 3: Add a Sketch-Loop to a Part

# Tutorial 3: Add a Sketch-Loop to a Part

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# Tutorial 3: Add a Sketch-Loop to a Part

## Sketch-Paths and Sketch-Loops

 If you click the Model name-tab, after completing Tutorials 1 and 2, you will not see a Solid. Why? Because Tutorials 1 & 2 add kinematic elements: Parts and Joints. We represent Part and Joint elements with symbolic shapes, which are not Solids.

### Objectives of Tutorial 3

 Before you can add an MD-Solid (see Tutorial 4) you must add a sketch-loop to a Part. There are two types of sketch-loops. •Those you construct from sketch-elements that you add to a Part •Those we construct for you with pseudo-lines and pseudo-arcs when you do Add Auto-Profile and/or Add Auto-Profiles. 0In this tutorial: •You add a sketch-loop that has Line and Arc sketch-elements. •You learn how to efficiently merge two points (and inefficiently). •For practice, you do Tutorial 1 again. You should be able to complete Tutorial 1 in less than one or two minutes.

#### Terminology

Term :

Definition

Part-Outline :

The symbol that you click to select a Part.

The Base-Part has a rectangular Part-Outline.

A Part you add to a Mechanism-Editor has an oval Part-Outline.

sketch-element :

A term for Line, CAD-Line, Arc, Circle, Blend-Curve, Point, and Spline sketch-elements that you can add to a Part with the Part-Editor > Geometry toolbar

start-Point :

When you add a Line, CAD-Line, Arc, or Blend-Curve: the Point at which you mouse-button-down.

end-Point :

When you add a Line, CAD-Line, Arc, or Blend-Curve: the Point at which you mouse-button-up.

Sketch-Path :

A series of sketch-elements that you join at their start-points and/or end-Points.

To be a sketch-path, it is important that you merge the start-Points and/or end-Points of adjacent sketch-elements.

Sketch-Loop :

A sketch-loop is a closed sketch-path. Also, the sketch-element cannot cross over or touch each other. There cannot be a Branch in which you merge three or more Points from three or more sketch-element.

Merged-Points:

Two start-Points, or two end-Points that you merge into one Point.

Tutorial 3: Add a Sketch-Loop to a Part.

 Tutorial 3: STEP 3.1   Tutorial 3: STEP 3.2 Tutorial 3: STEP 3.3 to STEP 3.6