Interview OS
Back to CAD & Mechanical Design

Library

Sketching & constraints

Geometric + dimensional control.

Modeling

Overview

Sketch constraints (coincident, parallel, dimensional) lock a 2D profile's degrees of freedom so it's fully defined and predictable. A properly constrained sketch is the stable base every feature builds on.

How it works

Modeling
DrawConstrainDimensionOutputGeometryentitiesGeometricrelationsNumericfully definedStable sketch
ClientServiceEdgeData

Step by step, with examples

  1. 1

    Geometry

    • Lines, arcs, and points.
  2. 2

    Geometric

    • Coincident, parallel, tangent relations.
  3. 3

    Numeric

    • Add driving dimensions.
  4. 4

    Stable sketch

    • Avoid under/over-constraint.
    • Example: black = defined

Overview

Use geometric (coincident, parallel, tangent) and dimensional constraints to fully define sketches with intent.

Common pitfalls

  • Over-defining (conflicts)
  • Dragging instead of constraining
  • No symmetry relations

Where this content comes from

For full transparency, this content is curated and verified from these sources:

ASME Y14.5 GD&T standardParametric CAD vendor documentationOppZen-authored CAD design guides