Tuesday, 22 November 2011

Creating a solid model using REVOLVE command


The Revolve tool allows you to create a solid body by revolving a sketch around the revolution axis, which could be a sketched line or an edge of an existing feature. Figure below shows a sketch for the revolved feature and
 Figure shows the Isometric view of the resulting feature revolved through an angle of 270-degree.
To convert a sketch into a revolved body, you need to invoke the Revolve tool. This tool works in the following three steps:
Step 1: Select the sketch to be revolved
Step 2: Select the revolution axis
Step 3: Specify the revolution parameters
To invoke the Revolve tool, choose the revolve button in the Feature dialog box; the Revolve dialog box will be displayed, as shown in Figure 
click on the picture to enlarge
 The options in this dialog box are same as the options in the Extrude dialog box, except the ones that are explained next.


Axis Rollout
The options in this rollout are used to specify the revolution axis. These options are discussed next.
Specify Vector
The options in this area are used to specify the revolution axis using the Vector Constructor button or the Inferred Vector drop-down list.
Vector Constructor
When you choose this button, the Vector dialog box will be displayed. You can specify the revolution axis by using this dialog box.

Inferred Vector
This drop-down list is a shortcut to specify the revolution axis.
Reverse Direction
You can choose this button to flip the direction of revolution.
Specify Point
The options in this area are used only when you use the vector method to specify the revolution axis.
Point Constructor
When you choose this button, the Point dialog box will be displayed. You can specify the point to define the revolution axis using this dialog box.
Inferred Point
This drop-down list contains the snap point options that are used to automatically snap the keypoints of the previously sketched entities or features



Limits Rollout
The options in this rollout are used to specify the start and termination angles of revolution.These options are discussed next.
Start Drop-down List
This drop-down list allows you to specify the start angle of the revolution feature. You can select the Value and Until Selected options from this drop-down list. The Value option allows you to enter the value of the start angle in the Angle edit box. You need to enter a positive value of the angle. This value will be taken as the offset value between the sketch and the start of the revolved feature. The Until Selected option allows you to start the revolve
feature from the selected plane, face, or body. When you select this option, the Face, Body,Datum Plane button will be chosen and you will be prompted to select the face, body, or datum plane to start the revolved feature.
End Drop-down List
This drop-down list allows you to specify the termination angle of the revolution feature. You can select the Value and Until Selected options from this drop-down list. The Value option allows you to enter the value of the end angle in the Angle edit box. You need to enter a positive value of the angle. This value will be taken as the offset value between the sketch and the end of the revolved feature. The Until Selected option allows you to terminate the
revolve feature using the selected plane, face, or body. When you select this option, the Face, Body, Datum Plane button will be chosen and you will be prompted to select the face, body, or datum plane to start the revolved feature.


The default value of the end angle is the value that you have used to create the last revolved feature. Figure below shows a revolved feature with the start angle as 30 degree and the end angle as 180-degree. The sketch used to create this feature is also displayed.
Note that NX uses the right-hand thumb rule to determine the direction of revolution. This rulestates that if the thumb of your right hand points in the direction of the axis of revolution, then the direction of the curled fingers will define the direction of revolution, refer to Figure
Figure below shows the sketch and an arrow pointing in the direction of the axis of revolution
and Figure below shows the resulting feature revolved through an angle of 180 degree.
And the sketch and an arrow pointing in the direction of the axis of revolution
the resulting feature revolved through an angle of 180-degree.
Offset Rollout
NX also allows you to create thin revolved bodies using the open and closed sketches. This process is similar to that of creating solid extruded features. Select the Offset rollout in the Revolve dialog box; the rollout will expand and display the Offset drop-down list. There is only one option, Two-Sided, available in this drop-down list. Select this option; the Start and the End edit boxes will be available. Enter the start and end offset values in the respective
edit boxes. Figure below shows a thin revolved model with the open sketch and the revolution axis used to create it. In this model, the start angle is 30 degree, the end angle is 180-degree, and the start offset value is 2.
Figure below shows a thin revolved model with the closed sketch and the revolution axis used to create it. In this model, the start angle is 45 degree, the end angle is 270-degree, and the start offset value is 2.












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