SHELL PROFILE MOUNTING ANGLE

Purpose:

This function is used to guide the mounting angle of shell profile webs, crossing the seam between two adjacent sections, during the assembly phase. The function calculates this 'mounting' angle between a shell profile web and a section seam, in the seam plane, and generates the complete dimensioning component automatically.

As described above, only seams defined as the intersection between the surface and a plane can be used.

The side of the shell profile web to calculate the angle is controlled by the Drafting default keyword DIM_ANG_SHELL_PROF_SIDE.

The length of the seam leg, that means, the leg simulating the seam side is controlled by the Drafting default keyword DIM_ANG_SHELL_PROF.LEG..

Instructions:

1. In Dimension menu, click 3D, then Shell Profile Mounting Angle.

2. The user indicates the section seam/shell curve and shell profile. Once indicated, the seam/curve will be valid until this function is left, or the user rejects the indication of a shell profile. Using the seam/curve indication, the view to present the dimensioning in, will be defined. The section seam/shell curve and the shell profile will together define the angle vertex and the two angle legs. The shell profile leg is defined as the intersection between the plane of the section seam and the shell profile web. The vertex is defined as the intersection between the section seam and the mold line of the profile.

3. The dimension arc will be presented in the view defined by the shell profile indication and is located by a user-defined point through which the dimension arc should pass, Once the dimension arc is located, the user drags the text denoting the measured angle into desired location. By clicking Options here, the text attributes like height, font, aspect etc can be changed. Note that the change of text height will be modal while change of other attributes only will apply on this dimensioning. Changing text attributes other than the height permanently is done by updating the corresponding default keywords via Format>Defaults. If the text is placed outside the sector (and the smallest angle is presented, see below) the arrows will flip 180 degrees and the dimension arc will be somewhat extended (useful when sectors are narrow).

4. Once created, the user is requested to create another dimensioning or quit the function. To remove the last created dimensioning, click Edit, then Delete Last Entity.

5. Initially, a dialog showing current dimension controls and parameters is displayed. Changes here can be done before the section seam/shell curve is given.

Text Orientation

The Text Orientation group shows the orientation of the dimension text:

• Horizontal

• Vertical

• Tangential

If Tangential orientation is selected, the text will be rotated to align with the dimension arc at the point on this arc closest to the text when positioned. Initially, the text is aligned to the middle of the dimension arc.

Tolerance

The Tolerance group shows the tolerance that will be appended to the resulting dimension text.

• None means no tolerance will be appended

• ± means symmetric tolerance. The value is typed in the field below.

• +/- means unsymmetrical tolerance. The Max and Min values are typed in the two fields below.

Include

The Include group shows what should be included in the resulting dimension text:

• Value - the measured angle

• Unit - the unit of the angle (degree symbol)

Range

Given the two leg lines, two different angles can be presented:

• Smallest - the indicated sector will be measured (up to 180 degrees)

• Biggest - the indicated plus the two adjacent sectors will be measured (up to 360 degrees)

Dimension Text

This field controls the format of the resulting dimension text. It is built up by intelligent markers and optionally string constants.

By clicking the Reset button, the contents of the field is reset to system default (only the measured angle plus unit is presented).

Intelligent markers available:

• #DIM()
  The measured angle

• ~0
  Unit symbol (degree)

• ~+<symmetric value>
  Symmetric tolerance

• ~+<max value>/<min value>

• Unsymmetrical tolerance

• #/

• New-line separator

  Note: The field is normally not edited by user. However, arbitrary text may be inserted at any position in between the intelligent markers.

Parameters

By selecting the Advanced button the user can view and optionally change any of the remaining parameters controlling the layout of the dimensioning. The parameters are:

• Number of decimal positions in the measured angle.

• Type and size of arrowhead at the ends of dimension arc.

• Height of dimension text.

• Reference line gap and excess.

Options:

None.

Result:

A complete dimensioning component, containing the dimension arc, the measure text and the reference lines are added to the drawing.