Exercise 9 – Creating Predefined Views
7.3 Linear Dimensions
Linear dimension elements are created under Layers owned by Views, as shown in section 7.1. Linear dimensions can contain the following dimension points, DPOI, DPPT or DPBA elements. The dimension element and the dimensions are automatically created by the application.
The diagram illustrates the following features that comprise a linear dimension
• Dimension Point - A LDIM (linear dimension) must contain at least 2 dimension points (DPPT).
• Projection Line – a projection line will be drawn from each dimension point in a direction specified by the user. A projection line can have intelligent text.
• Dimension Line – a dimension line will be drawn between all projection lines, these have terminators.
• Dimension Direction – this direction is defined by the user.
• Offset – the distance of the dimension line from the dimension point.
• Clearance – distance of start of projection line from dimension point.
• Overshoot – distance of end of projection line from dimension line.
L
Note: The values shown in the dimension text are taken directly from the 3D Design model. If the elements associated with the dimension points are moved in DESIGN, the dimension can be updated automatically by selecting Graphics>Update>Annotation.7.3.1 Creating Linear Dimensions
Linear Dimensions can be created by selecting
Create>Dimension>Dimension Linear or by clicking on the required style from the Linear Dimension Toolbar.
If the SHEE has multiple views ensure that the correct LAYE is selected from the Layers toolbar pull-down.
The dimensions that are members of the displayed LAYE can also have their display turned off.
Projection Line Direction
AVEVA Plant (12 Series) Drawing Production (Basic) TM-1002
www.aveva.com
Creating Linear dimensions using Create>Dimension>Dimension Linear will display the following form.
The name of the View and the View Direction are shown at the top of the form.
The following can be set via this form
• Type– gives the following options.
• Direction – the dimension line direction is the direction with respect to the world.
• Terminators – can be one of the following
Arrows
Dots
Obliques
Off
• Projection Line Text – can be selected from the pull down
• Projection Line Text Angle – allows the text to be orientated from the projection line Chained
Tail
Truncate
www.aveva.com
Click on the Derived button and the user will be prompted to identify a design element to derive the direction of the dimension.
Click OK and the following form will be displayed. This form is used to create the points that define the Dimensions and form the link with the 3D Model element.
The list on the left of the form sets how Dimension Points are created. The user must ensure that the correct option is selected in the list.
The default is that the Create button must be used for each point, but you can click on the symbol (to the right of the Create button) so the adjacent checkbox displays a tick. This allows you to create several points of the same type one after the other.
Note: The symbol must be off if you want to create Dimension Points in different ways, or if you want to use the 3D Pos, Cursor or Match line positioning options.
The user needs to click on Create and identify the elements to be dimensioned. This can be done in the 2D View by holding down the left mouse button (the pointer shape changes to a square) moving the pointer over the item and releasing the button. Note that when the pointer passes over a suitable item, that element is highlighted and its name is displayed in the Status Bar.
Once the dimension string is completed, hit the ESC key on the keyboard.
7.3.2 Deleting dimension points
To delete a dimension point, identify it in the 2D view, to make it the CE.
(It is advisable to check in the Draft Explorer that the element is highlighted.)
Either select Delete from the shortcut menu over the DPPT (Dimension Point) element in the Draft Explorer or select Delete>CE (Current Element) from the main menu bar.
In either case, click on Yes in the alert form that is displayed.
7.3.3 Modifying Linear Dimensions Graphically
To modifying linear dimensions graphically select modify mode from the icon on the 2D view. This mode is limited to changing the length of the projection lines, moving and rotating projection line text, moving and rotating dimension text.
When in modify mode, the mode will be displayed as shown and the icon will change colour
AVEVA Plant (12 Series) Drawing Production (Basic) TM-1002
www.aveva.com
7.3.4 Modifying Linear Dimensions
From the main bar menu select Modify>Dimension and a sub menu will be displayed with the following options
• Dimension Definition
• Dimension Colour & Font – allows the user to change the colour and font of the dimension
• Dimension Line – allows the user to modify the colour and style of the dimension line
• Projection Line - allows the user to modify the colour and style of the projection line
• Dimension Points
• Dimension Blanking
• Dimension Text
• Projection Text
• Sort Dimension Points
Selecting Dimension Definition will display the following form
This form is similar to the Create Form with one exception, and that is blanking. The purpose of blanking is to allow annotation to be shown clearly in crowded parts of a drawing, by removing an area of graphics.
Selecting Dimension Points will display the following form
The dimension point can be deleted, re-attached to a new design element, or additional dimension points can be created with the linear dimension.
Selecting POS from the toolbar, displays the following pull-down and allows the user to position the various parts of the dimension
Selecting PROJ from the toolbar, displays the following pull-down and allows the user to change the justification of the projection line text, change the projection line text and change the angle of the projection line text.
www.aveva.com
Selecting DIM from the toolbar, displays the following pull-down and allows the user to change the angle of the dimension text.
Selecting ATTS from the toolbar, displays the following pull-down and allows the user to change the attributes of the dimension
Selecting DIR from the toolbar, displays the following form and allows the user to change the direction of the dimension.