SolidWorks Assembly Design

A: The tell is orientation flips plus overdefinition only after a full rebuild. Symmetric mates are sensitive to reference loss, and when paired with in-context sketches, the mate solver can satisfy constraints in multiple ways until a forced solve collapses it. Lightweight loading delays cause missing references, not flipped orientation. Pattern instance order changes usually break mates outright. Flexible subassemblies changing state don't create circular definitions by themselves.

A: The boundary is temporal. Interference detection checks static snapshots unless motion with contact is solved finely. Fast-moving parts can pass through between steps. Static overlap is exactly what the tool checks. Knit gaps and suppression state are model hygiene issues but still evaluated at the snapshot.

A: The gating step is resolving lightweight parts before any spatial check. Interference on partial data gives false confidence. Locking mates comes after geometry is fully loaded. Mass properties depend on resolved bodies and come later.

A: The number is driven by diameter in meters. T = 0.15 × 140,000 × 0.02 gives 420 N·m. Pitch diameter use drops torque incorrectly. Safety factor is handled on preload selection, not reapplied. Radius halves the lever arm and the torque.