Exercise 8 Section Planes
11 Dimension Annotation
11.1.7.1 Dimension Deletion
A Dimension Point can be deleted by identification in the Draw Canvas of the Dimension Point Grip and clicking the Delete button from the Home tab or by pressing the <Delete> key.
Alternatively, on selecting the required Dimension Point to be deleted, a left mouse click on the Dimension Bin icon in the bottom right corner of the Draw Canvas deletes the Dimension Point.
The Draw Explorer may also be used to delete Dimension Points but without the reassurance of graphical feedback / picking in the Draw Canvas. Selection of Delete via the right-click context menu prompts a confirmation message.Dimension Tools 11.1.8
In addition to the Properties Grid and Draw Canvas grips, a dimension may also be modified by utilising the Gap and Blanking utilities found within the Annotate tab.
11.1.8.1 Blanking
The ability to hide or blank dimensions in a view aids clarity.
Utilising the Tools group of the Annotate tab, a Blanking Margin may be applied to a dimension. This margin obscures elements beneath to the specified distance from the dimension line.
Linear Dimension without Blanking Linear Dimension with Blanking
By default, a dimension is created without blanking and to a 0mm Blanking Margin.11.1.8.2 Gap
The ability to apply a gap to a dimension aids in the organisation and clarity of a View.
Utilising the Gap button within the Annotate group of the Annotate tab, a Gap may be applied to a selected dimension.
Defining a gap for dimension annotation trims any Projection Lines intersecting with area.
On clicking the Gap button from the Annotate group the user is prompted, where the dimension has not already been selected, to select the required dimension.
The Contextual Editor updates to prompt the specification of the first gap point or, on selecting the Centre menu option, the gap centre.
Continuing with the specification of the first gap point and utilising Object Snapping, the Projection Line may be selected at a point adjacent to the required area.
On selection of the first gap point, the Contextual Editor updates to prompt the specification of the second gap point. Utilising Object Snapping and observing the Draw Canvas feedback indicating gap area, a second point is selected on the Projection Line.
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The Contextual Editor updates to allow the user to continue creating gaps for the selected dimension; undo the previous gap definition or finish the command.
The Gap is inserted.
The inserted Gap is highlighted on selecting the dimension. Through the use of associated grips, the gap size and position can be easily modified.
A Gap can be deleted by selection of the Gap in the Draw Canvas and clicking the Delete button from the Home tab or by pressing the <Delete> key.
Alternatively, on selecting the required Gap to be deleted, a left mouse click on the Dimension Bin icon in the bottom right corner of the Draw Canvas deletes the Gap.
11.1.8.3 Explode
The Explode tool is located in the Modify group of the Explode tab and may be utilised to alter a Dimension to be formed by primitives.
The use of the Explode tool allows the independent modification of the constituent parts of a dimension.
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Linear Dimensions 11.2
A Linear Dimension is defined by a sequence of Dimension Points in a linear arrangement and is formed by the definition of the following Properties.
Dimension Point Defines the element to be dimensioned and may be defined by an Object Snap point. A Linear Dimension must contain at least two dimension points.
Variations to the default Dimension Point (DPPT) include the Dimension Before/After Point (DPBA) and Dimension from 3D Point (DPOI). Dimension Line An indicating line between Dimension Points, usually accompanied by Dimension Text defining identified measurement.
The Dimension Line may be further defined by Terminators and representation i.e. colour and line style. Dimension Line Direction is implied by order of definition of the Dimension Points.
Likewise the Dimension Text may be defined by representation properties angle, colour, font and height.
Projection Line An indicating line linking each Dimension Point to the Dimension Line at an Offset and Direction as defined by the user.
An accompanying Projection Line Text can be utilised to indicate the dimensioned element. This is aided by the use of Intelligent Text definitions whereby the element name is intrinsically linked to the output text i.e. the annotation will reflect the element name regardless of any alterations in Model.
The Overshoot property defines the distance the Projection Line extends past the Dimension Line and the Clearance property defines the start/trim of the Projection Line to the Dimension Point.
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 Model, the dimension can be updated automatically by selecting Update > Drawing > Annotation.There are three Linear Dimension modes: chained (orthogonal/aligned), baseline (left/right/aligned) and combined (left/right/aligned).
Chained Baseline
Combined
Creating Linear Dimensions 11.2.1
Before creating the Linear Dimension, the user should ensure the Current Owner is defined in the Sheet (required View or Region) and, if appropriate, a suitable Visual Layer has been selected via the Active Properties form.
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All Linear Dimension modes may be accessed via the Linear Dimension segmented button in the Annotate group of the Annotate and Home tabs.
Alternatively, the Draw Power Wheel may be utilised to access the Annotate Power Wheel and, in turn, allow selection of common Linear Dimension modes.
On selection of the required Linear Dimension the Contextual Editor updates to prompt the user to specify the first Dimension Point of the dimension.
At this point the Contextual Editor menu offers the opportunity to renege on the current dimension mode and define an alternative Orientation, Direction or Type.
Selecting the Type tile updates the Context Editor to prompt the user to select the required Linear Dimension type.
Selecting the Orientation tile updates the Context Editor to prompt the user to select a required orientation for the dimension.
Selecting the Direction tile updates the Context Editor to prompt the user to select a required direction for the dimension.
The first Dimension Point is defined by a click in the Draw Canvas on the required point (element) to be measured from.
Utilising Object Snapping an element may be selected in the Draw Canvas; for example filtering the pick to Element or P-Point – in addition to feedback through the cursor snap icon, the selected element is highlighted and named on positioning the cursor.
On creating the Dimension, the user may invoke the Draw Power Wheel via a right-click of the mouse combined with pressing the
<Shift> key to restrict mouse selection to a specific Object Snap point.
On selection of the first Dimension Point, the Contextual Editor updates to prompt the user to select a second Dimension Point. The selection process is repeated together with visual feedback in the Draw Canvas indicating the relative position of the selected points.
On selection of the second Dimension Point the Contextual Editor updates to prompt the user to specify the Dimension Line position by cursor pick in the Draw Canvas.
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On defining the Dimension Line position the Contextual Editor updates to prompt the definition of any additional Dimension Points.
On defining the required dimension points, the Finish tile from the Contextual Editor or the <Enter> key is selected to complete the dimension.