INDEX >> part6 > drawing dimensioning





To assign dimensions to a design, there are different kinds of dimensions to use according to the characteristics of the objects concerned.
We also need to set at least one "dimension style", to define the visualization and measurement of dimensions that will insert into the drawing.
These features may vary depending on the scale factor with which to print the drawing, so as to be sized correctly, or even according to the units we want to represent, e.g. centimeters or millimeters.


Let's take a practical example to understand better:
We see listed in the following two squares, the first of 3x3 units, the second of 30x30 units.
If you print them together on a scale of 1:1 will cause the former is 3 mm x 3 mm and the second 30mm x 30mm.
The size of the text and arrows of the dimensions may be fine as is.




Now consider the same design, as if the units were centimeters ....
If print it still in 1:1 scale, we might indicate (e.g. by writing on a corner) that the design is in 1:10 scale, but about the dimension style, we will leave them like that but considering them in cm.
We then printed two designs the same, but the second whit indicated "1:10 scale", represents a square of a 3cm x 3cm and a second of 30cm x 30cm.


However, if we want to print the second design, with the dimensions representing the mm, we have to set the "dimension style" to consider the size of a unit 10 times, indicating the first and second square respectively 30x30 and 300x300.


If we really wanted to print it on a scale of 1:1 (ie the truth or full scale) will set up a print scale to 10:1.
The design is then printed ten times bigger and with it the appearance of the shares will be ten times greater.
To bring aspect back to starting, we should go into settings and reduce the dimension style settings that affect the appearance of units, size of the text, and arrows.


We can also consider the second square as enlarged detail of the first.
In this case the dimensions given should be equal in respect of the same object represented with two different scale factors.
To do this we have two ways:


- Manually change the dimensions of the enlarged detail, after they've been created.


- Create a second "dimension style" where to set the scaling factor smaller (in
this case 0.1) and applies only to the dimensions of the enlarged detail.
We shall see shortly how to do this.



“Dimension Toolbar”


To draw dimensions on the design we'll use the "dimension toolbar" on which are the necessary commands.


dimension toolbar


With the new AutoCAD interface, find some commands to the dimensions already on the first tab “Home” in the group “Annotation”, or on the “Annotate” tab, in the group “Dimensions”.


dimension tools


dimension tools




We will look at the following commands to the creation of the main and more used dimensions:

  • linear dimension  Linear


  • aligned dimension  Aligned


  • radius dimension  Radius


  • diameter dimension  Diameter


  • angular dimension  Angular


  • dimension style  Dimension style







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