Ellipse AutoCAD

AutoCAD drawing command

Ellipse

Definition

An ellipse in AutoCAD is geometric figure, which by default is defined by two axes (the major and minor axis of ellipse). Note: program determines which axis is large and which is small, based on their relative length. If you set an equal length of axes of ellipse, you get circle, which is an ellipse object in AutoCAD.

Tool

Ellipse tool is command that allows you to build ellipses and elliptical arcs. first two points of ellipse determine location and length of first axis. third point defines distance between center of ellipse and end point of second axis.

Command

Ellipse

Object

Ellipse

In two-dimensional design, Ellipse object in AutoCAD is used quite rarely, but quite often in isometric design. Ellipse team allows you to build circles in axonometry, since it has Izokrug tool in its functionality.

Command Ellipse

For creation of an ellipse in AutoCAD, command Ellipse/Ellipse is responsible, which can be called up in following ways (start its construction):

• You can build ellipses in AutoCAD from menu bar; select item Drawing - Ellipse line;
• You can create it from Home tab of ribbon of tools - in group of tools Drawing button "Center, (Axis, end)", i.e. you immediately available in ribbon options for Ellipse command in AutoCAD;
• You can draw an Ellipse object from classic Drawing toolbar; Ellipse button;
• as well as direct creation of an ellipse in program from command line, writing command name in command line Ellipse.

Ways to build ellipses

By running Ellipse command, you can build ellipses in one of following ways:

• "Center" - building an ellipse in AutoCAD on central point and two semi-axes.
• "Axis, end" - creation of an ellipse along one of its axes and second semi-axis.
• "Rotate" - drawing in AutoCAD an ellipse along major axis and angle of rotation of circle.

All 3 ways allow you to create closed AutoCAD ellipse, but program also has Elliptical Arc tool.

How to build in Avtokad an ellipse along one of its axes and second semiaxis

After calling Ellipse command, this build method is available by default. command prompt will prompt:

In response to query, we indicate first end point of AutoCAD ellipse axis. yellow dashed line will appear, which will drag from first end point of axis to cross hairs cursor. system will display following query:

In response to request, we specify second end point of axis of AutoCAD ellipse. Now dashed line follows from midpoint of specified axis (from center of ellipse) to crosshair cursor. Its preview will appear, which will change as cursor moves. command prompt will prompt:

You can specify point in drawing or enter value in command line.

As soon as you specify length of second axis, ellipse in AutoCAD will be constructed, and Ellipse command will complete its execution.

Construction of ellipses in program on central point and two semi-axes

Call command AutoCAD Ellipse, then select Center option. command prompt will prompt:

Specify center point of ellipse in AutoCAD by clicking on drawing. yellow dashed line will appear, which will follow from center point of ellipse to cross hairs cursor. program will request:

You can specify end point of ellipse axis by clicking on drawing or enter half value for axis length on command line. preview of AutoCAD ellipse will appear, which will change as cursor moves. dashed line will follow from midpoint of specified axis (from center of ellipse) to crosshair cursor. program will display following query:

In response to this, you can specify point in drawing or enter half-axis value in command line. As soon as you specify length of second axis, ellipse in AutoCAD will be built, and Ellipse command will stop.

How to draw ellipses along major axis and angle of rotation of circle

After you specify major axis of ellipse in AutoCAD, query will appear on command line:

The length of other axis is minor axis of AutoCAD ellipse if you select "Rotate" option.

The "Rotate" option of Ellipse command allows you to rotate circle by certain angle (the specified major axis of ellipse is axis of rotation of circle), projection of which on working XY plane is an ellipse.

Select option "Rotate". system will display query:

The main axis is given major axis of ellipse. Rotation relative to main axis: i.e. it is necessary to set angle of rotation of circle.

Enter an angle of 180 degrees on command line or you can enter 0 degrees. As soon as you set rotation angle, ellipse in AutoCAD will be built, and Ellipse command will complete its execution.

Built ellipse in AutoCAD is circle, because if you entered 0 degrees, then we didn’t rotate circle around major axis of ellipse and its projection on XY working plane is circle.

Useful lessons and related topics

I recommend to get acquainted with similar lessons on AutoCAD:

• construction of elliptic arcs;
• convert ellipses to polyline;
• how to build ellipses in axonometry;
• how to draw circle.

Read and see also:

• how to draw objects.

Courses, tutorials AutoCAD:

1. 2D design.
2. 3D modeling.
3. descriptive geometry.
4. Engineering graphics.
5. House plan.
6. Assembly drawing of spur gear.
7. 3D kitchen model.

Video "Construction of ellipses in AutoCAD, as well as rings"