Assembly Modeling and Drawings
Constraints, joints, and documentation
Assemblies position components with constraints or joints. Mate, flush, angle, tangent, and insert constraints define relationships; joints offer a simpler assembly-oriented alternative. The first component is typically grounded. Degrees of freedom remain until enough constraints are applied, and the constraint readout reports what is left. Interference analysis and contact sets help validate motion.
Drawings and views
Drawing files reference the model rather than duplicating geometry. Candidates should know base, projected, section, detail, auxiliary, and broken views, plus how view orientation and scale work. Dimensions can be retrieved from the model or added manually, and a drawing standard governs annotation style. Bills of materials and parts lists derive from assembly structure, and balloons reference those items.
Traps in questions
Expect questions that confuse constraints with joints, or that assume a component is fixed when it is merely constrained. Another trap concerns adaptivity and its effect on assemblies. Questions may ask whether editing the model updates the drawing, which it does through associative references. Watch for items on view scale versus annotation scale, and on how a parts list reflects suppressed or phantom components.
Rule of thumb
Constrain to remove unwanted motion, not to force a specific position. If a component should never move, ground it; if it must move predictably, constrain its degrees of freedom deliberately. For drawings, remember that geometry is associative but manually placed annotations are not driven by the model.