Part 7
Module 32: Hatching
Learning Outcomes
When you have completed this module, you will be able to:
- Describe crosshatching, hatching boundaries, hatching patterns, and associative and nonassociative hatching.
- Explain sectional views, sections, and hatching in sectional views.
- Apply the HATCH and HATCHEDIT commands to insert and edit crosshatching patterns.
Crosshatching
Many drawings require areas to be filled with a pattern. This is called crosshatching or just hatching. There are many uses for hatch patterns on a drawing including displaying an object’s material type, the solid material that was cut through in the sectional view, difference materials used in one area to another, plus many other applications.
Hatching Boundaries
The HATCH command is used to insert hatch patterns. It allows you to select two different methods of selecting the boundary of the area to be filled in with the hatch pattern. The first method is picking an internal point and allow the HATCH command to find an enclosed boundary and the second method involves using an existing closed polyline to define the hatching boundary. The first method works well most of the time but for more complicated drawings, the second method must be used.
Hatching Patterns
There are many predefined hatch patterns including ANSI standards, ISO standards, and a solid fill pattern that are part of AutoCAD’s software. All hatch patterns are constructed using lines but hatch patterns are inserted as a single drawing object. This helps them to be easily manipulated and also keeps the drawing’s database small. A hatching pattern can be exploded, using the EXPLODE command, to convert it to individual lines.
Associative Verses Nonassociative Hatching
An associative hatch will automatically adjust when the boundary, that was used to create it, is moved or changed. A nonassociative hatch remains the same size and in the same location regardless of the changes made to the hatch’s boundary. An associative hatch is the default in the HATCH command.
An associative hatch can be changed to a nonassociative hatch by changing the properties of the object with the Properties window or with the HATCHEDIT command. A nonassociative hatch can never be changed to a associative hatch. It would have to be deleted and reinserted.
AutoCAD Command: HATCH
The HATCH command is used to insert a hatch pattern.
Shortcut: H
AutoCAD Command: HATCHEDIT
The HATCHEDIT command is used to edit an existing hatch pattern.
Shortcut: none
Drafting Lesson: Cross Sections – Part 1
When a view of an object requires a clearer description of its interior or it is hard to dimension because of the hidden lines, a cross section view can be drawn in place of the normal multiview. See Figure 32-1
A cross section view, also called a section, is a view of the object as if it were cut along a cutting plane and the two pieces pulled apart exposing the inside of the object. See Figure 32-2 and 32-4.
A cutting plane line is the line along the o