CAD blocks are named groups of objects that act as a single 2D or 3D object. You can use them to create repeated content such as drawing symbols, common components, and standard details. Blocks help you save time, maintain consistency, and reduce file size by reusing and sharing content rather than re-drawing it every time you need it.
With AutoCAD and AutoCAD LT software, you can create your own CAD blocks or choose from a large library of pre-made blocks, including:
You can add attributes or dynamic properties to CAD blocks so they can accommodate different text strings, shapes, or sizes. All CAD blocks can use the following properties:
Block unit, Color, Layer, Linetype, Linetype scale, Lineweight, Material, Name, Object name, Plot style, Position, Rotation, Scale X, Scale Y, Scale Z, Unit factor.
A dynamic block has flexibility and intelligence. You can easily change a dynamic block reference in a drawing while you work, manipulating the geometry through custom grips or custom properties. Dynamic blocks let you adjust the block reference in place as needed, rather than search for another block to insert, or redefine the existing one.
Using Design centre for blocks
AutoCAD has a small library of some standard blocks which you can use in your drawings, this library of blocks can be accessed from the design center palette. To open design center you can use keyboard shortcut CTRL + 2 or you can use its command ADCENTER.
The design center is simply a palette just like properties or layer properties manager palette. On this design center palette click on the home icon then select the en-us folder then DesignCenter folder and then select the drawing type from which you want to extract the blocks.
For example, you can use the kitchens.dwg file for kitchen blocks and House Designer.dwg for common household blocks. After selecting the drawing select Blocks from the object type and now you have a collection of blocks which you can insert in your drawing by simple drag and drop.
You can also use design center to extract blocks from an existing drawing. Simply click on the open icon on the top left of design center then locate your drawing and open it in the design center palette.
Now navigate to the drawing and select blocks and you will have your complete list of blocks from the drawing in the palette. You can drag and drop these blocks to bring them in your current drawing.
Using Tool Palettes for Blocks
AutoCAD also has many simple as well as dynamic blocks on the tool palette. You can access tool palette by using its keyboard shortcut CTRL + 3 or its command TOOLPALETTES.
Tool palette has many common blocks (especially dynamic blocks) that you can use directly in your drawing simply by dragging and dropping them in your drawing. You can also create your own tool palette and place your favorite CAD blocks on it, or you can create an entire catalog of your standard cad blocks using tool palettes.