Short Answer
The difference between full section and half section views lies in how much of the object is cut to reveal internal details. A full section view cuts the object entirely along the section plane, showing all internal features. It is used when complete internal details are necessary for better visualization.
A half section view cuts only one-half of the object while keeping the other half as a standard external view. This method is useful for symmetrical objects, as it shows both internal and external features in a single view, reducing the need for multiple drawings.
Detailed Explanation
Full Section View
A full section view is created when the object is completely cut through along a vertical or horizontal plane. The entire interior is visible in this view, making it easier to see holes, cavities, and other internal structures.
- How It Works
- A cutting plane line is drawn through the entire object.
- The sectioned area is hatched to indicate the material cut.
- All internal details are fully visible, eliminating the need for hidden lines.
- When to Use a Full Section View
- When all internal features need to be clearly visible.
- In complex parts where hidden lines make interpretation difficult.
- For objects like valves, casings, and mechanical housings that require a full interior view.
Half Section View
A half section view is used for symmetrical objects where only one-half of the object is sectioned, leaving the other half in normal projection. This method combines internal and external details in a single view.
- How It Works
- The cutting plane passes through half of the object.
- One side shows internal details, while the other side remains as an external view.
- A centerline is used to separate the two halves.
- When to Use a Half Section View
- When the object is symmetrical, making a full section unnecessary.
- To show both internal and external features in a single drawing.
- Commonly used for bearings, shafts, and cylindrical parts.
Key Differences
- Extent of Sectioning
- Full Section View: Cuts through the entire object.
- Half Section View: Cuts through only half of the object.
- Purpose
- Full Section View: Used for complex parts with many internal features.
- Half Section View: Used for symmetrical objects to save space and improve clarity.
- Use of Hidden Lines
- Full Section View: Eliminates all hidden lines, as everything is visible.
- Half Section View: Keeps hidden lines only in the non-sectioned half.
Conclusion
The difference between full section and half section views is that a full section cuts through the entire object, while a half section cuts through only one-half and keeps the other half as an external view. Full section views are best for detailed internal visualization, while half section views are ideal for symmetrical parts where both interior and exterior features need to be shown together.