6.1.4.3.1. Arc Revolution Surface
It allows the user to create an arc-revolution surface for defining Sphere To Arc Revolution Contact easily.
6.1.4.3.1.1. Modeling Options
The user can create a surface geometry by the following procedure.
Point, Direction, Point, Angle, Point, Direction, Angle
Point: Selects a point to define the arc center.
Direction: Defines an axis direction for generating the arc.
Point: Selects a point to define the start point of the arc.
Angle: Defines an angle of the arc.
Point: Selects a point to define the center point of the arc revolution.
Direction: Defines an axis direction of the arc revolution.
Angle: Defines a revolution angle.
Circle, Point, Direction, Angle
Circle: Selects a circular arc for the arc revolution.
Point: Selects a point to define the center point of the arc revolution.
Direction: Defines an axis direction of the arc revolution.
Angle: Defines a revolution angle.
Point: This option makes Arc Revolution directly. The user can modify its properties.
Point: Selects a point to define the center point of the arc revolution. And then an arc-revolution surface is created as the default value.
6.1.4.3.1.2. Properties
The user can modify the geometry information using the Arc Revolution Geometry property page.
![../_images/image11412.png](../_images/image11412.png)
Figure 6.61 Arc Revolution Surface property page
Arc Radius: Defines the radius of the arc.
Arc Start Angle: Defines the start angle of the arc. The start angle of the arc is toward +Y axis.
Arc End Angle: Defines the end angle of the arc.
Spin Radius: Defines the radius of the arc revolution. It is toward +Z axis.
Spin Start Angle: Defines the start angle of the arc revolution. The start angle of the arc is toward +X axis.
Spin End Angle: Defines the end angle of the arc revolution.
Vertical Offset: Defines a offset distance to Z axis.
Open Face: Define a fan-shaped surface on Spin start angle and/or Spin end angle. The face surface is generated when the check box is unchecked.
Figure 6.62 Dimensions
Helix Curve: If the user checks this option, then the arc center curve is defined on a helix curve.
Figure 6.63 A center position on the generated helix curve
Pitch: Defines the pitch length of the helix center curve.
Total Depth: Defines the total depth of the helix center curve.
Rotational Direction: CCW(Counterclockwise), and CW(Clockwise) can be available.
Figure 6.64 Definitions of Pitch, Total Depth, and Rotational Direction of the Helix Curve
Arc Center Offset: Defines additional options of the Helix Curve.
Expected CP Angle (Degree): Defines a negative direction of center offset. The angle means the definitions of the expected Contact Point.
Offset Distance: Defines an offset length in order to define a center point of a real arc-curve.
Figure 6.65 Definitions of Expected CP Angle and Offset Distance of the Arc Center Offset option of the Helix Curve
Note
The Gothic-Arch surface is not generated directly. It needs to assemble two Arc-Revolution Surfaces using Helix and Arc Center Offset options.
![../_images/image1196.png](../_images/image1196.png)