Section Lines
1. Section lined areas represent materials that have actually been in contact with the cutting plane line.
2. The general universal section line symbol is uniformly spaced at 45 degrees.
- In CAD, when an area has been hatched, the hatch takes on the characteristics of a BLOCK.
- In CAD, if your hatch angle is set to 0 degrees, the resulting hatch lines will be at an angle of 45 degrees.
- In CAD, the spacing of the hatch is determined by the scale of the hatch.
- In CAD, if you choose the ASSOCIATIVE hatching setting, once boundaries have been set and an area has been hatched, if you stretch the object, your hatching will also adjust to your new boundaries.
- In CAD, if you choose the NON-ASSOCIATIVE hatching setting, and your boundaries have been set and an area has been hatched, if you stretch the object, your hatching will remain and will not adjust to your new boundaries.
3. Instead of using section lines, parts may be shaded with a solid fill or hatch.
4. Outline sectioning may be used along the perimeter of very large areas.
5. Do not draw section lines parallel or perpendicular to visible edges.
6. Vary the angles of section lining for individual parts for mating objects or when objects are shown in an assembly drawing.
7. Various material section line symbols can be used to represent different parts that are adjacent and/or joined together.
8. Section lines should be thin to contrast with visible lines.
9. The spacing between section lines should be uniform. However the amount of the space may be varied to fit the size of the drawing or the area being hatched.
10. Capital letters are used at the end of the arrowheads when necessary to identify the cutting plane with the section view.
In CAD, crosshatching or section lines can be created with the BHATCH or HATCH command.
When using CAD, you must create a closed area to allow for the hatching to fill. These closed areas are called boundaries.