Understanding Dimensions in AutoCAD 2019
Adding dimensions to 3D objects in AutoCAD is an essential skill for precise modeling. The process involves several steps to ensure that dimensions are applied accurately to three-dimensional designs. Below is a comprehensive guide to dimensioning in AutoCAD 2019.
Step-by-Step Guide to Adding Dimensions to 3D Objects
-
Access Dimension Tools:
Begin by navigating to the Annotate tab on the ribbon. Look for the Dimensions panel and click on Linear or the specific dimension type you want to use. This will activate the dimensioning tools relevant for your current drawing. -
Select the First Point:
Click on the first extension line origin of the dimension you wish to create. This is usually one edge or corner of your 3D object that you want to measure from. -
Select the Second Point:
After selecting the first point, click on the second extension line origin. This should be another edge or corner of your 3D object. The software will begin to calculate the distance between the two selected origins. -
Utilize Rotated Dimensions:
If you want the dimension line to be oriented at a specific angle, type ‘r’ and press Enter. You’ll be prompted to enter the angle at which the dimension line should extend. This is useful for non-orthogonal dimensions in a 3D space. -
Position the Dimension Line:
Once the angle is specified, move your cursor to place the dimension line where you want it to appear on the drawing. Click once to set the position of the dimension line. - Finalizing the Dimension:
Review the dimension to ensure accuracy. If necessary, adjust it by clicking and dragging the dimension line or its associated text to the desired location.
Additional Dimensioning Options
Creating Aligned Dimensions
- Select the Aligned dimension tool from the Dimensions panel.
- Click on the first and second points of the 3D model.
- Place the dimension text manually by dragging it along the desired angle.
Angular Dimensions
To create an angular dimension:
- Select the Angular dimension tool.
- Click on two lines that form the angle.
- Move your cursor to place the dimension text accordingly.
Dimensioning Styles
Modifying dimension styles can help maintain consistency in your drawings:
- Go to the Home tab and click on the Annotation panel.
- Open the Dimension Style Manager.
- Select a style, modify it as needed — for instance, under the Fit tab, you can adjust how text is placed relative to the dimension line.
Frequently Asked Questions
1. Can I dimension 3D circles or arcs in AutoCAD?
Yes, you can dimension arcs and circles using the Arc Length dimension command available in the Dimensions panel. Just select the arc, and the software will provide the length of the arc.
2. What should I do if my dimensions are not displaying properly?
Check your dimension styles in the Dimension Style Manager. Make sure the correct scale and text options are selected for your drawing. It might also be necessary to adjust the visibility settings in the layer properties.
3. How can I remove dimensions after placing them?
Select the dimension line with the cursor and press the Delete key. Alternatively, you can use the DIMDISASSOCIATE command to detach dimensions from their objects while keeping them visible.
