781 Copyright Goodheart-Willcox Co., Inc. Learning Objectives will be able to: After completing this chapter, you u ✓ namic blocks. Explain the function of d yn ✓ and actions to blocks. Assign action parameters a ✓ y parameters Modi fy p and actions. c ✓ Assign value sets to parameters. ✓ Create and use chain actions. A standard block typically represents a very specific item, such as a hex head bolt fi that is 1″ long. In this example, if the same hex head bolt is available in three other ″ lengths, you must create three additional standard blocks. An alternative is to create a single dynamic block that can be adjusted to show each different bolt length. Dynamic blocks increase productivity and reduce the size of symbol libraries, making symbol libraries more manageable. Dynamic Block Fundamentals Dyn a mic Block Fund a ment a l s A dynamic block is a parametric symbol that you can adjust to change size, shape, and geometry without drawing additional blocks, and without affecting other instances of the block reference. Figure 26-1 shows an example of a dynamic block of a plan view single-swing door symbol. In this example, the dynamic properties of the block allow you to create many different single-swing door symbols according to specifi parameters, such as door size, wall thickness, swing location, swing angle fic representation, wall angle, and exterior or interior usage. The process of constructing and using dynamic blocks is identical to the process of creating standard blocks, except for the addition of action parameters and (usually) actions that control block geometry. AutoCAD refers to action parameters as parameters in the context of dynamic blocks. A dynamic block can contain multiple parameters, and a single parameter can include multiple actions. You can use geometric constraints and constraint parameters as an alternative or in addition to parameters and actions. dynamic block: An adjustable block to which you can assign parameters, actions, and geometric constraints and constraint parameters. action parameter (parameter): A specification for block construction that controls block characteristics such as positions, distances, and angles of dynamic block geometry. action: A definition that controls how dynamic block parameters behave. constraint parameters: Dimensional constraints that control the size or location of block geometry numerically. Introduction to Dynamic Blocks 26CHAPTER 26