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In computer modeling, assembly constraints are parameters that define geometric relationships between components in an assembly of parts.
When applied between certain parts, they remove the degrees of freedom of those parts (degrees of freedom are the directions in which an object can move, and there are 6 of them: backward/forwards or along the z axis, up/down or along the y axis, left/right or along the x axis, rotation around the z axis, rotation around the y axis, and rotation around the x axis.)
Types of assembly contraints include:
~mate: constrains two faces, edges, points, or axes together. Think of it as sticking two parts together.
~flush: constrains two faces or work features together. Think of it as lining two parts up, changing from ----- to -----
-------- --------
~angle: constrains two faces or edges at a specified angle to one another. This is pretty intuitive.
~insert: constrains a cylinder into a hole + flushes it so it fits just rights. This is, for example, how you put screws and bolts into their holes in an assembly.
~tangent: constrains a curved surface to a plane or other curved surface. This is like mate for curved surfaces.
Assembly contraints are different from geometric and numeric constraints. The former only applies in 2D sketches, and the latter is not only limited to 2D sketches but also only includes numeric values or aalgebraic equations.
In an assembly, you can also have drive constraints, which are simulated movements of assembled parts through specified steps. Though these occur in assemblies, they are not the same as assembly constraints.
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