A geometric representation is composed of four types of entities, namely points,
lines, surfaces, and volumes.
A layer is a grouping of entities. Defining layers in computer-aided design
allows us to work collectively with all the entities in one layer.
The creation of a profile of the mechanical part in our case study will be
carried out with the help of auxiliary lines. Two layers will be defined in
order to prevent these lines from appearing in the final drawing. The lines
that define the profile will be assigned to one of the layers, called the
"profile" layer, while the auxiliary lines will be assigned to the other layer,
called the "aux" layer. When the design of the part has been completed, the
entities in the "aux" layer will be erased.
Open the layer management window. This is found in Utilities Layers
.
Create two new layers called "aux" and "profile." Enter the
name of each layer in the Layers window (Figure 1) and click New .
Choose “aux” as the activated layer. To do this, click on
"aux" to highlight it and then click on the Layer To Use button. (Next
to this button the name of the activated layer will appear, "aux" in the
present case.) From now on, all the entities created will belong to this layer.
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Figure 1. The
Layers window
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