annotative trong cad

The annotative property was added in the AutoCAD 2008 version and it is a useful tool for keeping annotation size constant in AutoCAD. Prior to lớn the induction of the annotation scale of AutoCAD, the task of plotting objects with the correct scale for different viewports was a tedious job.

One had to lớn make multiple copies of the same object for different scales and the objects were then put on different layers and for each viewport or scale of drawing only appropriate layer was turned on keeping rest of the layers off.

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This process results in an unnecessary amount of data in drawing leading to lớn confusion and larger tệp tin size and it’s needless to lớn say that it also causes wastage of drafting time. The annotative property took this trouble out of drawing process.

Understanding Annotative property:

Let’s assume that we have a floor plan with maximum exterior dimensions of 525 inches and 336 inches. Now in order to lớn plot this drawing on a normal A3 size sheet of paper which is 420 X 297 milimet we need to lớn decrease the overall scale of drawing to lớn appropriate size.

Let’s select a scale of ¼” = 1’ which in layman’s term can be summed up as 0.25 inches on paper equals 1 feet on actual drawing. Now with this scale, the drawing looks lượt thích this on A3 paper.

Here all dimensions, text and blocks are clearly visible with respect to lớn the viewport. Now here is another drawing in which only the kitchen is included at a zoomed scale of 1” = 1’

Now obviously with a change of scale of viewport the scale of dimension text also changed in same proportion which you can see in the drawing but bởi we really need large dimension text as seen in figure 2?

Obviously, we don’t need large text we want uniform text and dimension size throughout different scales of the drawing. So we can assign the annotative property to lớn dimension and text and keep its size fixed in different scales throughout the drawing.

Figure 3 is again plotted at the scale of 1”=1’ but with annotative property assigned to lớn the dimension text in which size of dimension text is equal to lớn its size in A3 sheet (figure 1) where the scale was ¼”=1’ making it look more consistent.

Making Annotative dimension:

To make annotative dimension style type DIMSTYLE on the command line and press enter. A new dimension style manager window will pop up, click on the new button on right side of this window. Now give your dimension style a name, I am naming it as “My Anno Dim” and kiểm tra the annotative radio button then click on continue.

New dimension style window will pop up with multiple tabs, select text tab and change the size of text to lớn 1/8” or whatever paper height of text you want to lớn keep in all scales. Similarly, change arrow size from symbols and arrow tab to lớn 1/8”.

If you already have a dimension style for your drawing and you want to lớn make that style annotative then select your dimension style from dimension style manager then go to lớn fit tab and kiểm tra the annotative radio button from the scale for dimension features panel.

Click on OK to lớn close new dimension style manager and then click on close from dimension style manager window too.

Now our drawing is prepared with a new annotative dimension. Make My Anno Dim dimension style current by selecting it from dimension style drop down and add dimensions to lớn the drawing in model space using current annotative dimension style.

Adding Scale to lớn Annotative dimensions:

Before preparing the layout for final plotting we should decide the scales in which we want to lớn plot our drawing. Let’s assume that we want to lớn plot the drawing on A3 paper size and on three different scales 1”=1’, 1/8”=1’ and ½”=1’.

In order to lớn make annotative dimensions visible on all of these scales, we need to lớn add these scales to the dimensions. From status bar click on add scales… button  to turn it on, you can also turn on show annotation objects button to lớn see a real-time effect of the change in scale on your drawing, see figure 6 for reference.

For adding scale in an older version of AutoCAD type OBJECTSCALE on the command line and press enter then select all dimensions for which you want to lớn add scales then press enter again. Annotation object scale window will pop up, select add button and add scales to lớn the list and click OK to lớn close all open windows.

Now click on scale drop down thực đơn next to lớn add scales button and select scale 1”=1’ from the drop down thực đơn, repeat the process for 1/8”=1’ and ½”=1’ scales also. Now the scales are added to lớn the drawing and our drawing can now be prepared for plotting.

Do not add many scales to lớn the annotative dimensions because it may cause a lot of background processes and as a result, your software performance may suffer.

Preparing layout views:

Go to lớn layout tab and type PAGESETUP on the command line and press enter, select modify from page setup manager window and select ISO A3 paper size from the Paper Size drop-down thực đơn of page setup window. Click OK to lớn close page setup window.

Now create three rectangular viewports in paper space and assign scales of 1”=1’, 1/8”=1’ and ½”=1’ to lớn three viewports. You will notice that although we have different drawing components lượt thích text, blocks and geometries on different scales but the size of dimension text is constant throughout the viewports because of annotative property assigned to lớn them.

If you change the scale of any of these viewports to lớn the value other kêu ca the one which is assigned to lớn annotative dimension then the dimensions will not appear for that scale. In order to lớn make dimension appear for a new scale, you need to lớn add that scale to lớn the annotative dimensions as explained above.

Changing visibility of annotative object:

You can change the position of your annotative object according to lớn the scale. For example, in the scale of 1”=1’ the dimension appears in the middle of the dining table but for a scale of ½”=1’ the dimension may be made to lớn appear outside dining table for the same dimension as shown in figure 8.

To change the visibility of these objects simply activate viewports by double-clicking within them and move dimensions using grips to lớn the position where you want it to lớn appear for the particular viewport, the position of the annotative object will not change in another viewport.

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Conclusion:

The methods explained in this article can be used for assigning annotative scales to lớn other objects lượt thích Blocks, Hatch and Mtext also. The annotative feature is a great time saving and productivity tool that should be used in the drawing wherever required.

This tool not only helps in making a more organized and professional drawing but it also helps in keeping useless clutter out of the drawing that you are forced to lớn use if not using annotative property.

Do you have questions related to lớn this tip? Let bủ know in comments below.