How to Use Dimension Command in AutoCAD

Understanding the Dimension Command in AutoCAD

The Dimension Command is essential for accurately representing measurements in AutoCAD. It allows users to create various types of dimensions that communicate the size and location of objects within a drawing. This article will walk you through the process of using the Dimension Command effectively.

Accessing the Dimension Command

1. Activate the Command: Begin by typing DIM directly into the command line and press Enter. This simple command will initiate the dimensioning tools available in AutoCAD.

2. Select the Object: After activating the command, you will need to select the object you wish to dimension. Click on the line, arc, or other geometric shape you want the dimension to pertain to.

Types of Dimensions

AutoCAD offers several types of dimensions to choose from, each serving a specific purpose:

• Linear Dimension: For horizontal or vertical measurements.
• Radial Dimension: Used for circles and arcs.
• Angular Dimension: Measures the angle between two lines.
• Ordinate Dimension: Displays the coordinates of a point.
• Arc Length Dimension: Measures the length of the arc.

Setting Up Dimension Styles

Adjusting dimension styles can enhance the readability and aesthetics of your drawings.

1. Open Dimension Style Manager: Use the command DIMSTY or navigate to the Annotate tab and select Dimension Style.

2. Choose a Style: From the list, find the dimension style you wish to modify.

3. Modify Settings: Click on the “Modify” button. In this dialog, you can customize various settings, including text size, arrowhead style, and scale.

4. Finalize Changes: After making the adjustments, click OK to save your changes, then close the Dimension Style Manager.

Utilizing Units in Dimensions

To make sure your dimensions are displayed in the correct unit format (for instance, inches), follow these steps:

1. Access Dimension Style Manager: Again, type DIMSTY to bring up the style manager.

2. Select Your Style: Choose the existing style that you want to change.

3. Modify Units: Click on “Modify” and navigate to the “Primary Units” tab. Set the unit format to Decimals if you want to employ fractional inches.

4. Add Suffix: Enter the inch symbol (“) in the Suffix box, and set your precision according to your needs.

5. Apply Changes: Save your modifications and exit.

Creating Dimensions Step-by-Step

1. Initiate Dimension: Type DIM in the command line and hit Enter.

2. Select Points: Click to specify the startpoint and endpoint of the dimension line. For linear types, ensure you select objects in the correct sequence for accurate measurements.

3. Place Dimension: Move your cursor to place the dimension line appropriately and click to finalize.

Frequently Used Dimension Commands

• Dimlinear: Type DIMALIGNED for dimensions that follow the alignment of a given object.
• Dimangular: Type DIMANG to create angular dimensions efficiently.
• Dimradius: Type DIMRADIUS for radial dimensions on circles or arcs.

Frequently Asked Questions

1. How can I change dimension units after they have been set?
   You can revisit the Dimension Style Manager (DIMSTY), select the style in use, and modify the “Primary Units” settings to reflect any changes in unit measurement.

2. Is it possible to customize the appearance of dimension lines?
   Yes, you can modify dimension line appearances, including colors, line types, and arrow styles, through the Dimension Style Manager by selecting appropriate options in the “Lines” and “Symbols and Arrows” tabs.

3. What is the best way to keep dimensions organized in my drawing?
   Using layers specifically for dimensions allows for better organization. You can create a layer for each type of dimension, ensuring that they are easily viewable and manageable within your AutoCAD drawing.