what types of numeric constraints may be applied to sketches?
whaty disadvantages do CAD sketches have over freehand skethes?
1. Types of numeric constraints applied to sketches:
- Coincident constraint: Used to align and lock two sketch entities together.
- Horizontal constraint: Keeps a line or edge horizontal.
- Vertical constraint: Keeps a line or edge vertical.
- Parallel constraint: Ensures that two lines or edges remain parallel to each other.
- Perpendicular constraint: Forces two lines or edges to form a 90° angle with each other.
- Tangent constraint: Ensures that a line or edge is tangent to a circle or arc.
- Equal constraint: Keeps two lines or edges equal in length.
- Symmetry constraint: Forces multiple entities to be symmetric around a specific line or plane.
2. Disadvantages of CAD sketches compared to freehand sketches:
- Lack of spontaneity: CAD sketches require predefined geometric constraints, which can limit the freedom and spontaneity that is possible with freehand sketches.
- Learning curve: CAD software can have a steep learning curve compared to freehand sketching, as it requires proficiency in using the software itself and understanding the different tools and techniques available.
- Time-consuming: Creating a CAD sketch can be more time-consuming compared to a freehand sketch, especially when there are complex constraints and dimensions involved.
- Reliance on technology: CAD sketches heavily rely on specialized software and hardware, which may not be readily available or accessible to everyone. Freehand sketches can be created with just a pen and paper, making them more accessible.
- Difficulty in capturing personal style: CAD sketches can lack the personal touch and unique style that can be conveyed through freehand sketches. CAD software often standardizes the appearance of sketches, limiting the ability to express individual creativity.
It should be noted that CAD sketches also have several advantages over freehand sketches, such as precision, reproducibility, and easy editing, which make them highly valuable in engineering and design fields.