CADcaster

Annotation scaling was introduced first time on AutoCAD 2008. I love this feature. There are some work around AutoCAD users do before annotation scaling exist. But now, presenting our drawing in different scales is very easy and quick.

First, what is annotations?

Annotation is every object in your drawing which is not a model or geometry. We use annotation to show dimensions, text as description, symbols, and pattern to show sections, materials, etc.

The problem with annotation occurs when you need to represent your drawing in different scales.

Two images above are the same model in different viewport, with different scales. If we draw the model and prepare it to a certain scale, say 1:100, when we need to represent the drawing in 1:200 scale, the text, hatches, and all other annotations will be shown in half size to what we expected.

AutoCAD users used to create annotations in layout. But there are some downside.

1. It works for text and dimension, but not for hatches.
2. You may need to create more than one annotation to the same object, if you show them in different viewports. When you need to change the text content, you will have to change them all manually. Sometimes you left some of them unchanged.
3. When you move the viewport, some annotations might be left behind.

So, if you have those problems, you may love annotation scale.

Download and open this drawing. We are going to continue using the same drawing. Change your active scale from annotation scale list. It’s on your status bar. Change it to 1:100. We are going to set our drawing for 1:100 scale first.

Now open your dimension style. You should see a style named ’1-100 3mm’. Right click on it, and rename it to ’3 mm’. Click modify button on the right side of this dialog box.

On the FIT tab, scale for dimension features section, activate annotative.

1. On the Text tab, change text height to 3, offset from dimline to 1.
2. On Symbols and Arrows tab, change arrow size, center marks, and break size to 2.5.

Close the dimension style dialog box.

You see all your dimension text and arrow too small? Don’t worry. We need to update them to apply the changes.

Activate update in dimension panel, annotation tab. When AutoCAD ask you to select object, just type ALL then [enter]. Now you should see your dimension correctly.

Now we are going to add another scale to these dimensions. Activate ‘automatically add scales …bla..bla..bla…’ in annotation scale group.

Change the annotation scale to 1:200. You should see the dimension size adjusted for 1:200 scale! Turn off the ‘automatically add scales…’ again. Try to change the scale to 1:50. What happen? Nothing.

Open your layout. Select the left viewport border, and change the scale to 1:100. Press [esc] to deselect the viewport. Select the right viewport, and change the scale to 1:200.

Compare the dimension size on those two viewport. Even the viewports have different scales, the dimension size will always be the same! When you plot this sheet, the text in all viewports will be 3mm.

We will discuss more about annotation scale in the next post.

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Source: CAD Notes – Introduction to Annotation Scale
Go to Source: CAD Notes