How To Subtract In AutoCAD 2020?

Understanding the Subtraction Function in AutoCAD

Subtracting areas in AutoCAD is a crucial skill for precision modeling. The subtraction function allows you to eliminate overlapping sections of shapes or solids from one another, enhancing your design capabilities.

Using the Subtract Command

1. Start by Drawing the Required Shapes: Open your AutoCAD project and ensure you have the objects you wish to use prepared. You will need two overlapping objects; one will act as the primary figure, and the other will be the area to be subtracted.

2. Activate the Subtract Tool:

   • Located in the Home tab, navigate to the Modify panel.
   • Right-click to reveal a dropdown menu.
   • Select "Subtract" or simply type SUBTRACT in the command line and press Enter.

3. Select the Base Object: Click on the object that will remain after the subtraction. Once selected, press Enter to confirm your choice.

4. Choose the Object to Subtract: Now, select the object that you want to subtract from the base object. Press Enter after selecting this object. The overlapping area will be removed, showing a visual change to your primary shape.

How to Subtract Areas in AutoCAD 2025

1. Initiate Your Drawing: Start with your drawing open in AutoCAD 2025. Create the necessary shapes that will interact.

2. Access the Subtract Function:

   • Click on the Home tab, then find the Modify panel.
   • You may also type SURFTRIM for a more precise method.

3. Select the Base Shape: Choose the shape from which you want to remove an area and confirm your selection by pressing Enter.

4. Select the Area to Subtract: Click on the overlapping shape that you intend to remove from the main figure and press Enter again. This action will display the newly adjusted area, now lacking the subtracted portion.

Cutting Objects in AutoCAD 2025

1. Preparation and Selection: Begin with the object you want to keep and the edges that will trim it. Activate the trim command by locating it in the Modify panel.

2. Choose the Cutting Edges: Select the objects that act as your cutting edge, and confirm your selection by pressing Enter.

3. Select What to Trim: Next, click on the objects that you wish to trim and finalize the operation by pressing Enter.

Working with 3D Solids

Subtracting solid objects in AutoCAD is slightly different but straightforward:

1. Select the Objects: Identify both the solid you want to keep and the one you want to cut away.

2. Access the Subtract Solids Feature: From the Model tab, find the option for "Subtract Solids".

3. Confirm the Selection: After selecting the relevant solids, the program will remove the intersecting parts, shaping your model as needed.

FAQ

1. Can I subtract shapes of different types (like a line and a circle)?
No, the subtract command only works with region objects or solids. Ensure both selected objects are compatible; typically, both should be either solid or 2D regions.

2. What happens if I select the wrong object to subtract?
If you make a mistake, you can either undo the action immediately by pressing Ctrl + Z or re-run the subtract command and select the objects correctly.

3. Is there a way to preview what will be subtracted?
AutoCAD does not provide a built-in preview for the subtraction operation during selection. However, carefully reviewing the overlapping areas will help you make more informed selections before confirming the subtraction.