One of the most important and often under-rated capability of any CAD program is the ability of the software to place appropriate dimensioning into the drawing so that the design may be built by a construction team.

The example below shows a dimensioned design for a remembrance wall in a cemetery.


An example from the US. Dimensions in decimal feet.

US dimension example

Applying dimensions - accuracy is needed

gCADPlus creates a database when the drawing is produced, and it accesses this database whenever dimensional data needs to be added. Just as accuracy is important when creating a drawing, it is also important when adding dimensions. There is no point in drawing accurately and then being sloppy when adding dimensions. Care must be taken, and entity snaps should be used where appropriate.

Tip: If you always draw full size, as we have emphasized in all of our gCADPlus training materials, then you can (and should) let gCADPlus take its dimensioning from the model that you have constructed.

Types of dimensions

The figure below provides some guidance and advice for the application of linear dimensions to a plan view. While the actual dimensions might not be the units you would use, the positioning, distance from model, arrowhead sizes etc. are common to all dimension work.

Dimension spacing

Dimensions show the measurements of objects, the distances or angles between objects, or the distance of a feature from an origin you specify. gCADPlus provides three basic types of dimensioning: linear, radial, and angular.

Dimensions can be horizontal, vertical, aligned, rotated, ordinate.

It is possible to dimension objects, such as lines, arcs, circles, and polyline segments, or you can dimension between point locations. Note that gCADPlus places dimensions on the current layer, but it is a good idea to put dimensions on their own layer. We suggest using the name L-DIM in line with a published standard.

Every dimension assumes the current dimension style, which controls characteristics such as arrowhead style, text location, units format, etc. With dimension styles, you can make subtle modifications to a base dimension style for different types of dimensions. The figure below shows a timber screen in plan view with a dimension applied indicating that the screen is to be 2 meters long.

Adjusting dimension styles

Dimension style This short movie shows how to adjust a dimension style.

Using multiple dimension styles in the same drawing

Dimension style  Here we show how to use two different dimension styles in the same drawing.

Two dimension styles

Update a dimension style

Suppose that you decide that the text style being used for the dimensioning in this drawing is not well suited to your needs; the style Stylus BT is too close to the style used in the title block.

Dimension style Renaming a text type inside a dimension style can be a quick and efficient mechanism for changing the appearance of a gCADPlus design

Change Dimension Style

More movies on the use and application of dimensions

Dimension style Adjusting a dimension style - changing the precision value in a dimension style.

Manage dimension styles how to manage dimension styles.

Dimension style  We alter the linetype scale of a series of line entities in a gCADPlus drawing such that lines with a hidden linetype show correctly. Changes are made to a dimension style such that text height, arrowhead styles and units display appropriately.

Movie Check space available for wheelchair movement in a landscape plan.

Wheelchair Here we discuss the importance of modeling full size.