Which tool would you use to ensure proper alignment of components in an assembly?

The constraint tool is essential for ensuring proper alignment of components in an assembly because it allows you to define relationships and limits between different parts. By applying constraints, you can control how parts move relative to one another, such as parallelism, coincident points, and angular relationships. This is crucial for maintaining the intended design and function of the assembly, as it ensures that components fit together correctly and move as desired.

In the context of a CAD environment, constraints enforce geometric and dimensional relationships which govern the behavior of the parts within an assembly. For example, using a coincident constraint can force two surfaces to be flush against each other, while a distance constraint can maintain a specific separation between components.

The other tools may serve useful purposes but do not specifically address alignment in the same structured manner. The measure tool helps you ascertain dimensions and distances but does not enforce relationships. The fillet tool is used to create rounded corners or edges on parts, while the assembly tool generally refers to the process of putting components together rather than the alignment itself. Therefore, the constraint tool stands out as the most relevant for achieving proper alignment in assemblies.