constraint
A rule, limitation, or geometric relationship applied to a CAD model to restrict its movement, size, or orientation.
In CAD, constraints can be geometric (making two lines parallel or concentric) or dimensional (locking a line to exactly 50 millimeters).
Word relationships
- limitation: Limitation is a general restriction, while a constraint in CAD is a precise mathematical rule that locks down degrees of freedom.
- restriction: Restriction implies keeping something within bounds, whereas a constraint mathematically defines geometric relationships.
- freedom: In CAD, a 'degree of freedom' is an unconstrained direction in which a part or sketch element can freely move.
Commonly confused with
- restraint: Restraint usually refers to physical holding back (like a seatbelt), while constraint refers to logical or geometric rules.
Word family
- constrain (verb): To compel or force, or in CAD, to apply geometric rules to a model.
- constrained (adjective): Restricted or limited by rules or boundaries.
Collocations
- geometric constraint
- dimensional constraint
- design constraints
- budgetary constraints
Example sentences
- "We had to apply a concentric constraint to ensure the bolt stayed perfectly centered inside the mounting hole." A CAD tutorial explaining how to lock down a sketch.
Memory hook
Think of a 'constrictor' snake. It wraps around its prey and 'constrains' its movement. In CAD, a constraint wraps around a line and stops it from moving. Constraints lock it down.
When not to use
Do not use when describing physical barriers or emotional limitations unless you are drawing a metaphor to design rules.
Fun facts
- A fully defined CAD sketch has zero degrees of freedom, meaning every single line and point is locked in place by constraints and cannot be accidentally dragged.
Related words
Explore more words
circumscribe, unconstrained, optimize, form factor, specification, align
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