For a 2D drawing that has one view, you could create both the model and its annotation entirely in model space, without using a layout.
This method is simple but has several limitations, including
If you draw and plot from model space, you must determine and apply a scale factor to annotation objects before you plot. Follow the steps below.
Before you begin drawing in model space, decide what each unit on the screen represents, such as an inch, a millimeter, or a kilometer. For example, if you are drawing a motor part, you might decide that one drawing unit equals a millimeter. If you are drawing a map, you might decide that one unit equals a kilometer.
Once you have determined a drawing unit for the drawing, you need to specify the style for displaying the drawing unit, which includes the unit type and precision. For example, a value of 14.5 can be displayed as 14.500, 14-1/2, or 1'2-1/2".
Specify the display style of drawing units with the UNITS command. The default drawing unit type is decimal.
Before you draw, you should set the scale for dimensions, annotations, and blocks in your drawings. Scaling these elements beforehand ensures that they are at the correct size when you plot the final drawing.
You should enter the scale for the following objects:
The system variables used for inserting blocks are INSUNITS, INSUNITSDEFSOURCE, and INSUNITSDEFTARGET. This also applies to the border and title block of the drawing.
You can also use annotative objects if you want to scale annotations automatically.
To plot your drawing from the Model layout, you calculate the exact scale factor by converting the drawing scale to a ratio of 1:n. This ratio compares plotted units to drawing units that represent the actual size of the objects you are drawing.
For example, if you plan to plot at a scale of 1/4 inch = 1 foot, you would calculate the scale factor 48 as follows:
1/4" = 12"
1 = 12 x 4
1 (plotted unit) = 48 (drawing units)
Using the same calculation, the scale factor for 1 centimeter = 1 meter is 100, and the scale factor for 1 inch = 20 feet is 240.
Scale |
Scale factor |
To plot text size at |
Set drawing text size to |
---|---|---|---|
1 cm = 1 m |
100 |
3 mm |
30 cm |
1/8" = 1'-0" |
96 |
1/8" |
12" |
3/16" = 1'-0" |
64 |
1/8" |
8" |
1/4" = 1'-0" |
48 |
1/8" |
6" |
3/8" = 1'-0" |
32 |
1/8" |
4" |
1/2" = 1'-0" |
24 |
1/8" |
3" |
3/4" = 1'-0" |
16 |
1/8" |
2" |
1" = 1'-0" |
12 |
1/8" |
1.5" |
1 1/2" = 1'-0" |
8 |
1/8" |
1.0" |
If you are working in metric units, you might have a sheet size of 210 x 297 mm (A4 size) and a scale factor of 20. You calculate grid limits as follows:
210 x 20 = 4200 mm
297 x 20 = 5900 mm