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Constraint tips siemens NX

Although you do not need to fully constrain a sketch to use it for downstream feature creation, the best practice is to fully constrain sketches. A fully constrained sketch ensures that a solution can be consistently found during design change. Note the following tips on how to constrain a sketch and what to do when a sketch is over constrained:

  • You can use a combination of Automatic and Driving Dimensions, and Constraints to fully constrain a sketch.

  • Whenever you encounter an overconstrained or a conflicting constraint status, you should resolve the situation immediately by deleting some dimensions or constraints.

  • Perpendicular, Horizontal, and Vertical dimensions maintain their direction when the expression value is set to zero. You can also enter negative values for these three dimension types to achieve the same results as using the Alternate Solution command. Avoid zero dimensions for other dimension types. Using zero dimensions leads to problems with ambiguous relative positioning to other curves. This can cause unexpected results when changing the dimension back to a nonzero value.

  • Use lines rather than linear splines to model linear sketch segments. Although they appear to be the same geometrically, lines and linear splines behave differently during sketch evaluation.

  • You can also use reference curves to assist in constraining objects. You create reference curves from sketch curves with the Convert To/From Reference command.

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